Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/kernel/seccomp.c

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Differences between /kernel/seccomp.c (Version 3.17) and /kernel/seccomp.c (Version 3.6)


  1 /*                                                  1 /*
  2  * linux/kernel/seccomp.c                           2  * linux/kernel/seccomp.c
  3  *                                                  3  *
  4  * Copyright 2004-2005  Andrea Arcangeli <andr      4  * Copyright 2004-2005  Andrea Arcangeli <andrea@cpushare.com>
  5  *                                                  5  *
  6  * Copyright (C) 2012 Google, Inc.                  6  * Copyright (C) 2012 Google, Inc.
  7  * Will Drewry <wad@chromium.org>                   7  * Will Drewry <wad@chromium.org>
  8  *                                                  8  *
  9  * This defines a simple but solid secure-comp      9  * This defines a simple but solid secure-computing facility.
 10  *                                                 10  *
 11  * Mode 1 uses a fixed list of allowed system      11  * Mode 1 uses a fixed list of allowed system calls.
 12  * Mode 2 allows user-defined system call filt     12  * Mode 2 allows user-defined system call filters in the form
 13  *        of Berkeley Packet Filters/Linux Soc     13  *        of Berkeley Packet Filters/Linux Socket Filters.
 14  */                                                14  */
 15                                                    15 
 16 #include <linux/atomic.h>                          16 #include <linux/atomic.h>
 17 #include <linux/audit.h>                           17 #include <linux/audit.h>
 18 #include <linux/compat.h>                          18 #include <linux/compat.h>
 19 #include <linux/sched.h>                           19 #include <linux/sched.h>
 20 #include <linux/seccomp.h>                         20 #include <linux/seccomp.h>
 21 #include <linux/slab.h>                        << 
 22 #include <linux/syscalls.h>                    << 
 23                                                    21 
 24 /* #define SECCOMP_DEBUG 1 */                      22 /* #define SECCOMP_DEBUG 1 */
 25                                                    23 
 26 #ifdef CONFIG_SECCOMP_FILTER                       24 #ifdef CONFIG_SECCOMP_FILTER
 27 #include <asm/syscall.h>                           25 #include <asm/syscall.h>
 28 #include <linux/filter.h>                          26 #include <linux/filter.h>
 29 #include <linux/pid.h>                         << 
 30 #include <linux/ptrace.h>                          27 #include <linux/ptrace.h>
 31 #include <linux/security.h>                        28 #include <linux/security.h>
                                                   >>  29 #include <linux/slab.h>
 32 #include <linux/tracehook.h>                       30 #include <linux/tracehook.h>
 33 #include <linux/uaccess.h>                         31 #include <linux/uaccess.h>
 34                                                    32 
 35 /**                                                33 /**
 36  * struct seccomp_filter - container for secco     34  * struct seccomp_filter - container for seccomp BPF programs
 37  *                                                 35  *
 38  * @usage: reference count to manage the objec     36  * @usage: reference count to manage the object lifetime.
 39  *         get/put helpers should be used when     37  *         get/put helpers should be used when accessing an instance
 40  *         outside of a lifetime-guarded secti     38  *         outside of a lifetime-guarded section.  In general, this
 41  *         is only needed for handling filters     39  *         is only needed for handling filters shared across tasks.
 42  * @prev: points to a previously installed, or     40  * @prev: points to a previously installed, or inherited, filter
 43  * @len: the number of instructions in the pro     41  * @len: the number of instructions in the program
 44  * @insnsi: the BPF program instructions to ev !!  42  * @insns: the BPF program instructions to evaluate
 45  *                                                 43  *
 46  * seccomp_filter objects are organized in a t     44  * seccomp_filter objects are organized in a tree linked via the @prev
 47  * pointer.  For any task, it appears to be a      45  * pointer.  For any task, it appears to be a singly-linked list starting
 48  * with current->seccomp.filter, the most rece     46  * with current->seccomp.filter, the most recently attached or inherited filter.
 49  * However, multiple filters may share a @prev     47  * However, multiple filters may share a @prev node, by way of fork(), which
 50  * results in a unidirectional tree existing i     48  * results in a unidirectional tree existing in memory.  This is similar to
 51  * how namespaces work.                            49  * how namespaces work.
 52  *                                                 50  *
 53  * seccomp_filter objects should never be modi     51  * seccomp_filter objects should never be modified after being attached
 54  * to a task_struct (other than @usage).           52  * to a task_struct (other than @usage).
 55  */                                                53  */
 56 struct seccomp_filter {                            54 struct seccomp_filter {
 57         atomic_t usage;                            55         atomic_t usage;
 58         struct seccomp_filter *prev;               56         struct seccomp_filter *prev;
 59         struct bpf_prog *prog;                 !!  57         unsigned short len;  /* Instruction count */
                                                   >>  58         struct sock_filter insns[];
 60 };                                                 59 };
 61                                                    60 
 62 /* Limit any path through the tree to 256KB wo     61 /* Limit any path through the tree to 256KB worth of instructions. */
 63 #define MAX_INSNS_PER_PATH ((1 << 18) / sizeof     62 #define MAX_INSNS_PER_PATH ((1 << 18) / sizeof(struct sock_filter))
 64                                                    63 
 65 /*                                             !!  64 /**
                                                   >>  65  * get_u32 - returns a u32 offset into data
                                                   >>  66  * @data: a unsigned 64 bit value
                                                   >>  67  * @index: 0 or 1 to return the first or second 32-bits
                                                   >>  68  *
                                                   >>  69  * This inline exists to hide the length of unsigned long.  If a 32-bit
                                                   >>  70  * unsigned long is passed in, it will be extended and the top 32-bits will be
                                                   >>  71  * 0. If it is a 64-bit unsigned long, then whatever data is resident will be
                                                   >>  72  * properly returned.
                                                   >>  73  *
 66  * Endianness is explicitly ignored and left f     74  * Endianness is explicitly ignored and left for BPF program authors to manage
 67  * as per the specific architecture.               75  * as per the specific architecture.
 68  */                                                76  */
 69 static void populate_seccomp_data(struct secco !!  77 static inline u32 get_u32(u64 data, int index)
 70 {                                                  78 {
 71         struct task_struct *task = current;    !!  79         return ((u32 *)&data)[index];
 72         struct pt_regs *regs = task_pt_regs(ta !!  80 }
 73         unsigned long args[6];                 !!  81 
 74                                                !!  82 /* Helper for bpf_load below. */
 75         sd->nr = syscall_get_nr(task, regs);   !!  83 #define BPF_DATA(_name) offsetof(struct seccomp_data, _name)
 76         sd->arch = syscall_get_arch();         !!  84 /**
 77         syscall_get_arguments(task, regs, 0, 6 !!  85  * bpf_load: checks and returns a pointer to the requested offset
 78         sd->args[0] = args[0];                 !!  86  * @off: offset into struct seccomp_data to load from
 79         sd->args[1] = args[1];                 !!  87  *
 80         sd->args[2] = args[2];                 !!  88  * Returns the requested 32-bits of data.
 81         sd->args[3] = args[3];                 !!  89  * seccomp_check_filter() should assure that @off is 32-bit aligned
 82         sd->args[4] = args[4];                 !!  90  * and not out of bounds.  Failure to do so is a BUG.
 83         sd->args[5] = args[5];                 !!  91  */
 84         sd->instruction_pointer = KSTK_EIP(tas !!  92 u32 seccomp_bpf_load(int off)
                                                   >>  93 {
                                                   >>  94         struct pt_regs *regs = task_pt_regs(current);
                                                   >>  95         if (off == BPF_DATA(nr))
                                                   >>  96                 return syscall_get_nr(current, regs);
                                                   >>  97         if (off == BPF_DATA(arch))
                                                   >>  98                 return syscall_get_arch(current, regs);
                                                   >>  99         if (off >= BPF_DATA(args[0]) && off < BPF_DATA(args[6])) {
                                                   >> 100                 unsigned long value;
                                                   >> 101                 int arg = (off - BPF_DATA(args[0])) / sizeof(u64);
                                                   >> 102                 int index = !!(off % sizeof(u64));
                                                   >> 103                 syscall_get_arguments(current, regs, arg, 1, &value);
                                                   >> 104                 return get_u32(value, index);
                                                   >> 105         }
                                                   >> 106         if (off == BPF_DATA(instruction_pointer))
                                                   >> 107                 return get_u32(KSTK_EIP(current), 0);
                                                   >> 108         if (off == BPF_DATA(instruction_pointer) + sizeof(u32))
                                                   >> 109                 return get_u32(KSTK_EIP(current), 1);
                                                   >> 110         /* seccomp_check_filter should make this impossible. */
                                                   >> 111         BUG();
 85 }                                                 112 }
 86                                                   113 
 87 /**                                               114 /**
 88  *      seccomp_check_filter - verify seccomp     115  *      seccomp_check_filter - verify seccomp filter code
 89  *      @filter: filter to verify                 116  *      @filter: filter to verify
 90  *      @flen: length of filter                   117  *      @flen: length of filter
 91  *                                                118  *
 92  * Takes a previously checked filter (by bpf_c !! 119  * Takes a previously checked filter (by sk_chk_filter) and
 93  * redirects all filter code that loads struct    120  * redirects all filter code that loads struct sk_buff data
 94  * and related data through seccomp_bpf_load.     121  * and related data through seccomp_bpf_load.  It also
 95  * enforces length and alignment checking of t    122  * enforces length and alignment checking of those loads.
 96  *                                                123  *
 97  * Returns 0 if the rule set is legal or -EINV    124  * Returns 0 if the rule set is legal or -EINVAL if not.
 98  */                                               125  */
 99 static int seccomp_check_filter(struct sock_fi    126 static int seccomp_check_filter(struct sock_filter *filter, unsigned int flen)
100 {                                                 127 {
101         int pc;                                   128         int pc;
102         for (pc = 0; pc < flen; pc++) {           129         for (pc = 0; pc < flen; pc++) {
103                 struct sock_filter *ftest = &f    130                 struct sock_filter *ftest = &filter[pc];
104                 u16 code = ftest->code;           131                 u16 code = ftest->code;
105                 u32 k = ftest->k;                 132                 u32 k = ftest->k;
106                                                   133 
107                 switch (code) {                   134                 switch (code) {
108                 case BPF_LD | BPF_W | BPF_ABS: !! 135                 case BPF_S_LD_W_ABS:
109                         ftest->code = BPF_LDX  !! 136                         ftest->code = BPF_S_ANC_SECCOMP_LD_W;
110                         /* 32-bit aligned and     137                         /* 32-bit aligned and not out of bounds. */
111                         if (k >= sizeof(struct    138                         if (k >= sizeof(struct seccomp_data) || k & 3)
112                                 return -EINVAL    139                                 return -EINVAL;
113                         continue;                 140                         continue;
114                 case BPF_LD | BPF_W | BPF_LEN: !! 141                 case BPF_S_LD_W_LEN:
115                         ftest->code = BPF_LD | !! 142                         ftest->code = BPF_S_LD_IMM;
116                         ftest->k = sizeof(stru    143                         ftest->k = sizeof(struct seccomp_data);
117                         continue;                 144                         continue;
118                 case BPF_LDX | BPF_W | BPF_LEN !! 145                 case BPF_S_LDX_W_LEN:
119                         ftest->code = BPF_LDX  !! 146                         ftest->code = BPF_S_LDX_IMM;
120                         ftest->k = sizeof(stru    147                         ftest->k = sizeof(struct seccomp_data);
121                         continue;                 148                         continue;
122                 /* Explicitly include allowed     149                 /* Explicitly include allowed calls. */
123                 case BPF_RET | BPF_K:          !! 150                 case BPF_S_RET_K:
124                 case BPF_RET | BPF_A:          !! 151                 case BPF_S_RET_A:
125                 case BPF_ALU | BPF_ADD | BPF_K !! 152                 case BPF_S_ALU_ADD_K:
126                 case BPF_ALU | BPF_ADD | BPF_X !! 153                 case BPF_S_ALU_ADD_X:
127                 case BPF_ALU | BPF_SUB | BPF_K !! 154                 case BPF_S_ALU_SUB_K:
128                 case BPF_ALU | BPF_SUB | BPF_X !! 155                 case BPF_S_ALU_SUB_X:
129                 case BPF_ALU | BPF_MUL | BPF_K !! 156                 case BPF_S_ALU_MUL_K:
130                 case BPF_ALU | BPF_MUL | BPF_X !! 157                 case BPF_S_ALU_MUL_X:
131                 case BPF_ALU | BPF_DIV | BPF_K !! 158                 case BPF_S_ALU_DIV_X:
132                 case BPF_ALU | BPF_DIV | BPF_X !! 159                 case BPF_S_ALU_AND_K:
133                 case BPF_ALU | BPF_AND | BPF_K !! 160                 case BPF_S_ALU_AND_X:
134                 case BPF_ALU | BPF_AND | BPF_X !! 161                 case BPF_S_ALU_OR_K:
135                 case BPF_ALU | BPF_OR | BPF_K: !! 162                 case BPF_S_ALU_OR_X:
136                 case BPF_ALU | BPF_OR | BPF_X: !! 163                 case BPF_S_ALU_LSH_K:
137                 case BPF_ALU | BPF_XOR | BPF_K !! 164                 case BPF_S_ALU_LSH_X:
138                 case BPF_ALU | BPF_XOR | BPF_X !! 165                 case BPF_S_ALU_RSH_K:
139                 case BPF_ALU | BPF_LSH | BPF_K !! 166                 case BPF_S_ALU_RSH_X:
140                 case BPF_ALU | BPF_LSH | BPF_X !! 167                 case BPF_S_ALU_NEG:
141                 case BPF_ALU | BPF_RSH | BPF_K !! 168                 case BPF_S_LD_IMM:
142                 case BPF_ALU | BPF_RSH | BPF_X !! 169                 case BPF_S_LDX_IMM:
143                 case BPF_ALU | BPF_NEG:        !! 170                 case BPF_S_MISC_TAX:
144                 case BPF_LD | BPF_IMM:         !! 171                 case BPF_S_MISC_TXA:
145                 case BPF_LDX | BPF_IMM:        !! 172                 case BPF_S_ALU_DIV_K:
146                 case BPF_MISC | BPF_TAX:       !! 173                 case BPF_S_LD_MEM:
147                 case BPF_MISC | BPF_TXA:       !! 174                 case BPF_S_LDX_MEM:
148                 case BPF_LD | BPF_MEM:         !! 175                 case BPF_S_ST:
149                 case BPF_LDX | BPF_MEM:        !! 176                 case BPF_S_STX:
150                 case BPF_ST:                   !! 177                 case BPF_S_JMP_JA:
151                 case BPF_STX:                  !! 178                 case BPF_S_JMP_JEQ_K:
152                 case BPF_JMP | BPF_JA:         !! 179                 case BPF_S_JMP_JEQ_X:
153                 case BPF_JMP | BPF_JEQ | BPF_K !! 180                 case BPF_S_JMP_JGE_K:
154                 case BPF_JMP | BPF_JEQ | BPF_X !! 181                 case BPF_S_JMP_JGE_X:
155                 case BPF_JMP | BPF_JGE | BPF_K !! 182                 case BPF_S_JMP_JGT_K:
156                 case BPF_JMP | BPF_JGE | BPF_X !! 183                 case BPF_S_JMP_JGT_X:
157                 case BPF_JMP | BPF_JGT | BPF_K !! 184                 case BPF_S_JMP_JSET_K:
158                 case BPF_JMP | BPF_JGT | BPF_X !! 185                 case BPF_S_JMP_JSET_X:
159                 case BPF_JMP | BPF_JSET | BPF_ << 
160                 case BPF_JMP | BPF_JSET | BPF_ << 
161                         continue;                 186                         continue;
162                 default:                          187                 default:
163                         return -EINVAL;           188                         return -EINVAL;
164                 }                                 189                 }
165         }                                         190         }
166         return 0;                                 191         return 0;
167 }                                                 192 }
168                                                   193 
169 /**                                               194 /**
170  * seccomp_run_filters - evaluates all seccomp    195  * seccomp_run_filters - evaluates all seccomp filters against @syscall
171  * @syscall: number of the current system call    196  * @syscall: number of the current system call
172  *                                                197  *
173  * Returns valid seccomp BPF response codes.      198  * Returns valid seccomp BPF response codes.
174  */                                               199  */
175 static u32 seccomp_run_filters(int syscall)       200 static u32 seccomp_run_filters(int syscall)
176 {                                                 201 {
177         struct seccomp_filter *f = ACCESS_ONCE !! 202         struct seccomp_filter *f;
178         struct seccomp_data sd;                << 
179         u32 ret = SECCOMP_RET_ALLOW;              203         u32 ret = SECCOMP_RET_ALLOW;
180                                                   204 
181         /* Ensure unexpected behavior doesn't     205         /* Ensure unexpected behavior doesn't result in failing open. */
182         if (unlikely(WARN_ON(f == NULL)))      !! 206         if (WARN_ON(current->seccomp.filter == NULL))
183                 return SECCOMP_RET_KILL;          207                 return SECCOMP_RET_KILL;
184                                                   208 
185         /* Make sure cross-thread synced filte << 
186         smp_read_barrier_depends();            << 
187                                                << 
188         populate_seccomp_data(&sd);            << 
189                                                << 
190         /*                                        209         /*
191          * All filters in the list are evaluat    210          * All filters in the list are evaluated and the lowest BPF return
192          * value always takes priority (ignori    211          * value always takes priority (ignoring the DATA).
193          */                                       212          */
194         for (; f; f = f->prev) {               !! 213         for (f = current->seccomp.filter; f; f = f->prev) {
195                 u32 cur_ret = BPF_PROG_RUN(f-> !! 214                 u32 cur_ret = sk_run_filter(NULL, f->insns);
196                                                << 
197                 if ((cur_ret & SECCOMP_RET_ACT    215                 if ((cur_ret & SECCOMP_RET_ACTION) < (ret & SECCOMP_RET_ACTION))
198                         ret = cur_ret;            216                         ret = cur_ret;
199         }                                         217         }
200         return ret;                               218         return ret;
201 }                                                 219 }
202 #endif /* CONFIG_SECCOMP_FILTER */             << 
203                                                << 
204 static inline bool seccomp_may_assign_mode(uns << 
205 {                                              << 
206         assert_spin_locked(&current->sighand-> << 
207                                                << 
208         if (current->seccomp.mode && current-> << 
209                 return false;                  << 
210                                                << 
211         return true;                           << 
212 }                                              << 
213                                                << 
214 static inline void seccomp_assign_mode(struct  << 
215                                        unsigne << 
216 {                                              << 
217         assert_spin_locked(&task->sighand->sig << 
218                                                << 
219         task->seccomp.mode = seccomp_mode;     << 
220         /*                                     << 
221          * Make sure TIF_SECCOMP cannot be set << 
222          * filter) is set.                     << 
223          */                                    << 
224         smp_mb__before_atomic();               << 
225         set_tsk_thread_flag(task, TIF_SECCOMP) << 
226 }                                              << 
227                                                << 
228 #ifdef CONFIG_SECCOMP_FILTER                   << 
229 /* Returns 1 if the parent is an ancestor of t << 
230 static int is_ancestor(struct seccomp_filter * << 
231                        struct seccomp_filter * << 
232 {                                              << 
233         /* NULL is the root ancestor. */       << 
234         if (parent == NULL)                    << 
235                 return 1;                      << 
236         for (; child; child = child->prev)     << 
237                 if (child == parent)           << 
238                         return 1;              << 
239         return 0;                              << 
240 }                                              << 
241                                                << 
242 /**                                            << 
243  * seccomp_can_sync_threads: checks if all thr << 
244  *                                             << 
245  * Expects sighand and cred_guard_mutex locks  << 
246  *                                             << 
247  * Returns 0 on success, -ve on error, or the  << 
248  * either not in the correct seccomp mode or i << 
249  * seccomp filter.                             << 
250  */                                            << 
251 static inline pid_t seccomp_can_sync_threads(v << 
252 {                                              << 
253         struct task_struct *thread, *caller;   << 
254                                                << 
255         BUG_ON(!mutex_is_locked(&current->sign << 
256         assert_spin_locked(&current->sighand-> << 
257                                                << 
258         /* Validate all threads being eligible << 
259         caller = current;                      << 
260         for_each_thread(caller, thread) {      << 
261                 pid_t failed;                  << 
262                                                << 
263                 /* Skip current, since it is i << 
264                 if (thread == caller)          << 
265                         continue;              << 
266                                                << 
267                 if (thread->seccomp.mode == SE << 
268                     (thread->seccomp.mode == S << 
269                      is_ancestor(thread->secco << 
270                                  caller->secco << 
271                         continue;              << 
272                                                << 
273                 /* Return the first thread tha << 
274                 failed = task_pid_vnr(thread); << 
275                 /* If the pid cannot be resolv << 
276                 if (unlikely(WARN_ON(failed == << 
277                         failed = -ESRCH;       << 
278                 return failed;                 << 
279         }                                      << 
280                                                << 
281         return 0;                              << 
282 }                                              << 
283                                                   220 
284 /**                                               221 /**
285  * seccomp_sync_threads: sets all threads to u !! 222  * seccomp_attach_filter: Attaches a seccomp filter to current.
286  *                                             << 
287  * Expects sighand and cred_guard_mutex locks  << 
288  * seccomp_can_sync_threads() to have returned << 
289  * without dropping the locks.                 << 
290  *                                             << 
291  */                                            << 
292 static inline void seccomp_sync_threads(void)  << 
293 {                                              << 
294         struct task_struct *thread, *caller;   << 
295                                                << 
296         BUG_ON(!mutex_is_locked(&current->sign << 
297         assert_spin_locked(&current->sighand-> << 
298                                                << 
299         /* Synchronize all threads. */         << 
300         caller = current;                      << 
301         for_each_thread(caller, thread) {      << 
302                 /* Skip current, since it need << 
303                 if (thread == caller)          << 
304                         continue;              << 
305                                                << 
306                 /* Get a task reference for th << 
307                 get_seccomp_filter(caller);    << 
308                 /*                             << 
309                  * Drop the task reference to  << 
310                  * current's path will hold a  << 
311                  * allows a put before the ass << 
312                  */                            << 
313                 put_seccomp_filter(thread);    << 
314                 smp_store_release(&thread->sec << 
315                                   caller->secc << 
316                 /*                             << 
317                  * Opt the other thread into s << 
318                  * As threads are considered t << 
319                  * equivalent (see ptrace_may_ << 
320                  * allow one thread to transit << 
321                  */                            << 
322                 if (thread->seccomp.mode == SE << 
323                         /*                     << 
324                          * Don't let an unpriv << 
325                          * the no_new_privs re << 
326                          * a thread that sets  << 
327                          * then dies.          << 
328                          */                    << 
329                         if (task_no_new_privs( << 
330                                 task_set_no_ne << 
331                                                << 
332                         seccomp_assign_mode(th << 
333                 }                              << 
334         }                                      << 
335 }                                              << 
336                                                << 
337 /**                                            << 
338  * seccomp_prepare_filter: Prepares a seccomp  << 
339  * @fprog: BPF program to install                 223  * @fprog: BPF program to install
340  *                                                224  *
341  * Returns filter on success or an ERR_PTR on  !! 225  * Returns 0 on success or an errno on failure.
342  */                                               226  */
343 static struct seccomp_filter *seccomp_prepare_ !! 227 static long seccomp_attach_filter(struct sock_fprog *fprog)
344 {                                                 228 {
345         struct seccomp_filter *filter;            229         struct seccomp_filter *filter;
346         unsigned long fp_size;                 !! 230         unsigned long fp_size = fprog->len * sizeof(struct sock_filter);
347         struct sock_filter *fp;                !! 231         unsigned long total_insns = fprog->len;
348         int new_len;                           << 
349         long ret;                                 232         long ret;
350                                                   233 
351         if (fprog->len == 0 || fprog->len > BP    234         if (fprog->len == 0 || fprog->len > BPF_MAXINSNS)
352                 return ERR_PTR(-EINVAL);       !! 235                 return -EINVAL;
353         BUG_ON(INT_MAX / fprog->len < sizeof(s !! 236 
354         fp_size = fprog->len * sizeof(struct s !! 237         for (filter = current->seccomp.filter; filter; filter = filter->prev)
                                                   >> 238                 total_insns += filter->len + 4;  /* include a 4 instr penalty */
                                                   >> 239         if (total_insns > MAX_INSNS_PER_PATH)
                                                   >> 240                 return -ENOMEM;
355                                                   241 
356         /*                                        242         /*
357          * Installing a seccomp filter require !! 243          * Installing a seccomp filter requires that the task have
358          * CAP_SYS_ADMIN in its namespace or b    244          * CAP_SYS_ADMIN in its namespace or be running with no_new_privs.
359          * This avoids scenarios where unprivi    245          * This avoids scenarios where unprivileged tasks can affect the
360          * behavior of privileged children.       246          * behavior of privileged children.
361          */                                       247          */
362         if (!task_no_new_privs(current) &&     !! 248         if (!current->no_new_privs &&
363             security_capable_noaudit(current_c    249             security_capable_noaudit(current_cred(), current_user_ns(),
364                                      CAP_SYS_A    250                                      CAP_SYS_ADMIN) != 0)
365                 return ERR_PTR(-EACCES);       !! 251                 return -EACCES;
366                                                   252 
367         fp = kzalloc(fp_size, GFP_KERNEL|__GFP !! 253         /* Allocate a new seccomp_filter */
368         if (!fp)                               !! 254         filter = kzalloc(sizeof(struct seccomp_filter) + fp_size,
369                 return ERR_PTR(-ENOMEM);       !! 255                          GFP_KERNEL|__GFP_NOWARN);
                                                   >> 256         if (!filter)
                                                   >> 257                 return -ENOMEM;
                                                   >> 258         atomic_set(&filter->usage, 1);
                                                   >> 259         filter->len = fprog->len;
370                                                   260 
371         /* Copy the instructions from fprog. *    261         /* Copy the instructions from fprog. */
372         ret = -EFAULT;                            262         ret = -EFAULT;
373         if (copy_from_user(fp, fprog->filter,  !! 263         if (copy_from_user(filter->insns, fprog->filter, fp_size))
374                 goto free_prog;                !! 264                 goto fail;
375                                                   265 
376         /* Check and rewrite the fprog via the    266         /* Check and rewrite the fprog via the skb checker */
377         ret = bpf_check_classic(fp, fprog->len !! 267         ret = sk_chk_filter(filter->insns, filter->len);
378         if (ret)                                  268         if (ret)
379                 goto free_prog;                !! 269                 goto fail;
380                                                   270 
381         /* Check and rewrite the fprog for sec    271         /* Check and rewrite the fprog for seccomp use */
382         ret = seccomp_check_filter(fp, fprog-> !! 272         ret = seccomp_check_filter(filter->insns, filter->len);
383         if (ret)                               << 
384                 goto free_prog;                << 
385                                                << 
386         /* Convert 'sock_filter' insns to 'bpf << 
387         ret = bpf_convert_filter(fp, fprog->le << 
388         if (ret)                               << 
389                 goto free_prog;                << 
390                                                << 
391         /* Allocate a new seccomp_filter */    << 
392         ret = -ENOMEM;                         << 
393         filter = kzalloc(sizeof(struct seccomp << 
394                          GFP_KERNEL|__GFP_NOWA << 
395         if (!filter)                           << 
396                 goto free_prog;                << 
397                                                << 
398         filter->prog = kzalloc(bpf_prog_size(n << 
399                                GFP_KERNEL|__GF << 
400         if (!filter->prog)                     << 
401                 goto free_filter;              << 
402                                                << 
403         ret = bpf_convert_filter(fp, fprog->le << 
404         if (ret)                                  273         if (ret)
405                 goto free_filter_prog;         !! 274                 goto fail;
406         kfree(fp);                             << 
407                                                << 
408         atomic_set(&filter->usage, 1);         << 
409         filter->prog->len = new_len;           << 
410                                                   275 
411         bpf_prog_select_runtime(filter->prog); !! 276         /*
412                                                !! 277          * If there is an existing filter, make it the prev and don't drop its
413         return filter;                         !! 278          * task reference.
414                                                !! 279          */
415 free_filter_prog:                              !! 280         filter->prev = current->seccomp.filter;
416         kfree(filter->prog);                   !! 281         current->seccomp.filter = filter;
417 free_filter:                                   !! 282         return 0;
                                                   >> 283 fail:
418         kfree(filter);                            284         kfree(filter);
419 free_prog:                                     !! 285         return ret;
420         kfree(fp);                             << 
421         return ERR_PTR(ret);                   << 
422 }                                                 286 }
423                                                   287 
424 /**                                               288 /**
425  * seccomp_prepare_user_filter - prepares a us !! 289  * seccomp_attach_user_filter - attaches a user-supplied sock_fprog
426  * @user_filter: pointer to the user data cont    290  * @user_filter: pointer to the user data containing a sock_fprog.
427  *                                                291  *
428  * Returns 0 on success and non-zero otherwise    292  * Returns 0 on success and non-zero otherwise.
429  */                                               293  */
430 static struct seccomp_filter *                 !! 294 long seccomp_attach_user_filter(char __user *user_filter)
431 seccomp_prepare_user_filter(const char __user  << 
432 {                                                 295 {
433         struct sock_fprog fprog;                  296         struct sock_fprog fprog;
434         struct seccomp_filter *filter = ERR_PT !! 297         long ret = -EFAULT;
435                                                   298 
436 #ifdef CONFIG_COMPAT                              299 #ifdef CONFIG_COMPAT
437         if (is_compat_task()) {                   300         if (is_compat_task()) {
438                 struct compat_sock_fprog fprog    301                 struct compat_sock_fprog fprog32;
439                 if (copy_from_user(&fprog32, u    302                 if (copy_from_user(&fprog32, user_filter, sizeof(fprog32)))
440                         goto out;                 303                         goto out;
441                 fprog.len = fprog32.len;          304                 fprog.len = fprog32.len;
442                 fprog.filter = compat_ptr(fpro    305                 fprog.filter = compat_ptr(fprog32.filter);
443         } else /* falls through to the if belo    306         } else /* falls through to the if below. */
444 #endif                                            307 #endif
445         if (copy_from_user(&fprog, user_filter    308         if (copy_from_user(&fprog, user_filter, sizeof(fprog)))
446                 goto out;                         309                 goto out;
447         filter = seccomp_prepare_filter(&fprog !! 310         ret = seccomp_attach_filter(&fprog);
448 out:                                              311 out:
449         return filter;                         !! 312         return ret;
450 }                                              << 
451                                                << 
452 /**                                            << 
453  * seccomp_attach_filter: validate and attach  << 
454  * @flags:  flags to change filter behavior    << 
455  * @filter: seccomp filter to add to the curre << 
456  *                                             << 
457  * Caller must be holding current->sighand->si << 
458  *                                             << 
459  * Returns 0 on success, -ve on error.         << 
460  */                                            << 
461 static long seccomp_attach_filter(unsigned int << 
462                                   struct secco << 
463 {                                              << 
464         unsigned long total_insns;             << 
465         struct seccomp_filter *walker;         << 
466                                                << 
467         assert_spin_locked(&current->sighand-> << 
468                                                << 
469         /* Validate resulting filter length. * << 
470         total_insns = filter->prog->len;       << 
471         for (walker = current->seccomp.filter; << 
472                 total_insns += walker->prog->l << 
473         if (total_insns > MAX_INSNS_PER_PATH)  << 
474                 return -ENOMEM;                << 
475                                                << 
476         /* If thread sync has been requested,  << 
477         if (flags & SECCOMP_FILTER_FLAG_TSYNC) << 
478                 int ret;                       << 
479                                                << 
480                 ret = seccomp_can_sync_threads << 
481                 if (ret)                       << 
482                         return ret;            << 
483         }                                      << 
484                                                << 
485         /*                                     << 
486          * If there is an existing filter, mak << 
487          * task reference.                     << 
488          */                                    << 
489         filter->prev = current->seccomp.filter << 
490         current->seccomp.filter = filter;      << 
491                                                << 
492         /* Now that the new filter is in place << 
493         if (flags & SECCOMP_FILTER_FLAG_TSYNC) << 
494                 seccomp_sync_threads();        << 
495                                                << 
496         return 0;                              << 
497 }                                                 313 }
498                                                   314 
499 /* get_seccomp_filter - increments the referen    315 /* get_seccomp_filter - increments the reference count of the filter on @tsk */
500 void get_seccomp_filter(struct task_struct *ts    316 void get_seccomp_filter(struct task_struct *tsk)
501 {                                                 317 {
502         struct seccomp_filter *orig = tsk->sec    318         struct seccomp_filter *orig = tsk->seccomp.filter;
503         if (!orig)                                319         if (!orig)
504                 return;                           320                 return;
505         /* Reference count is bounded by the n    321         /* Reference count is bounded by the number of total processes. */
506         atomic_inc(&orig->usage);                 322         atomic_inc(&orig->usage);
507 }                                                 323 }
508                                                   324 
509 static inline void seccomp_filter_free(struct  << 
510 {                                              << 
511         if (filter) {                          << 
512                 bpf_prog_free(filter->prog);   << 
513                 kfree(filter);                 << 
514         }                                      << 
515 }                                              << 
516                                                << 
517 /* put_seccomp_filter - decrements the ref cou    325 /* put_seccomp_filter - decrements the ref count of tsk->seccomp.filter */
518 void put_seccomp_filter(struct task_struct *ts    326 void put_seccomp_filter(struct task_struct *tsk)
519 {                                                 327 {
520         struct seccomp_filter *orig = tsk->sec    328         struct seccomp_filter *orig = tsk->seccomp.filter;
521         /* Clean up single-reference branches     329         /* Clean up single-reference branches iteratively. */
522         while (orig && atomic_dec_and_test(&or    330         while (orig && atomic_dec_and_test(&orig->usage)) {
523                 struct seccomp_filter *freeme     331                 struct seccomp_filter *freeme = orig;
524                 orig = orig->prev;                332                 orig = orig->prev;
525                 seccomp_filter_free(freeme);   !! 333                 kfree(freeme);
526         }                                         334         }
527 }                                                 335 }
528                                                   336 
529 /**                                               337 /**
530  * seccomp_send_sigsys - signals the task to a    338  * seccomp_send_sigsys - signals the task to allow in-process syscall emulation
531  * @syscall: syscall number to send to userlan    339  * @syscall: syscall number to send to userland
532  * @reason: filter-supplied reason code to sen    340  * @reason: filter-supplied reason code to send to userland (via si_errno)
533  *                                                341  *
534  * Forces a SIGSYS with a code of SYS_SECCOMP     342  * Forces a SIGSYS with a code of SYS_SECCOMP and related sigsys info.
535  */                                               343  */
536 static void seccomp_send_sigsys(int syscall, i    344 static void seccomp_send_sigsys(int syscall, int reason)
537 {                                                 345 {
538         struct siginfo info;                      346         struct siginfo info;
539         memset(&info, 0, sizeof(info));           347         memset(&info, 0, sizeof(info));
540         info.si_signo = SIGSYS;                   348         info.si_signo = SIGSYS;
541         info.si_code = SYS_SECCOMP;               349         info.si_code = SYS_SECCOMP;
542         info.si_call_addr = (void __user *)KST    350         info.si_call_addr = (void __user *)KSTK_EIP(current);
543         info.si_errno = reason;                   351         info.si_errno = reason;
544         info.si_arch = syscall_get_arch();     !! 352         info.si_arch = syscall_get_arch(current, task_pt_regs(current));
545         info.si_syscall = syscall;                353         info.si_syscall = syscall;
546         force_sig_info(SIGSYS, &info, current)    354         force_sig_info(SIGSYS, &info, current);
547 }                                                 355 }
548 #endif  /* CONFIG_SECCOMP_FILTER */               356 #endif  /* CONFIG_SECCOMP_FILTER */
549                                                   357 
550 /*                                                358 /*
551  * Secure computing mode 1 allows only read/wr    359  * Secure computing mode 1 allows only read/write/exit/sigreturn.
552  * To be fully secure this must be combined wi    360  * To be fully secure this must be combined with rlimit
553  * to limit the stack allocations too.            361  * to limit the stack allocations too.
554  */                                               362  */
555 static int mode1_syscalls[] = {                   363 static int mode1_syscalls[] = {
556         __NR_seccomp_read, __NR_seccomp_write,    364         __NR_seccomp_read, __NR_seccomp_write, __NR_seccomp_exit, __NR_seccomp_sigreturn,
557         0, /* null terminated */                  365         0, /* null terminated */
558 };                                                366 };
559                                                   367 
560 #ifdef CONFIG_COMPAT                              368 #ifdef CONFIG_COMPAT
561 static int mode1_syscalls_32[] = {                369 static int mode1_syscalls_32[] = {
562         __NR_seccomp_read_32, __NR_seccomp_wri    370         __NR_seccomp_read_32, __NR_seccomp_write_32, __NR_seccomp_exit_32, __NR_seccomp_sigreturn_32,
563         0, /* null terminated */                  371         0, /* null terminated */
564 };                                                372 };
565 #endif                                            373 #endif
566                                                   374 
567 int __secure_computing(int this_syscall)          375 int __secure_computing(int this_syscall)
568 {                                                 376 {
                                                   >> 377         int mode = current->seccomp.mode;
569         int exit_sig = 0;                         378         int exit_sig = 0;
570         int *syscall;                             379         int *syscall;
571         u32 ret;                                  380         u32 ret;
572                                                   381 
573         /*                                     !! 382         switch (mode) {
574          * Make sure that any changes to mode  << 
575          * been seen after TIF_SECCOMP was see << 
576          */                                    << 
577         rmb();                                 << 
578                                                << 
579         switch (current->seccomp.mode) {       << 
580         case SECCOMP_MODE_STRICT:                 383         case SECCOMP_MODE_STRICT:
581                 syscall = mode1_syscalls;         384                 syscall = mode1_syscalls;
582 #ifdef CONFIG_COMPAT                              385 #ifdef CONFIG_COMPAT
583                 if (is_compat_task())             386                 if (is_compat_task())
584                         syscall = mode1_syscal    387                         syscall = mode1_syscalls_32;
585 #endif                                            388 #endif
586                 do {                              389                 do {
587                         if (*syscall == this_s    390                         if (*syscall == this_syscall)
588                                 return 0;         391                                 return 0;
589                 } while (*++syscall);             392                 } while (*++syscall);
590                 exit_sig = SIGKILL;               393                 exit_sig = SIGKILL;
591                 ret = SECCOMP_RET_KILL;           394                 ret = SECCOMP_RET_KILL;
592                 break;                            395                 break;
593 #ifdef CONFIG_SECCOMP_FILTER                      396 #ifdef CONFIG_SECCOMP_FILTER
594         case SECCOMP_MODE_FILTER: {               397         case SECCOMP_MODE_FILTER: {
595                 int data;                         398                 int data;
596                 struct pt_regs *regs = task_pt << 
597                 ret = seccomp_run_filters(this    399                 ret = seccomp_run_filters(this_syscall);
598                 data = ret & SECCOMP_RET_DATA;    400                 data = ret & SECCOMP_RET_DATA;
599                 ret &= SECCOMP_RET_ACTION;        401                 ret &= SECCOMP_RET_ACTION;
600                 switch (ret) {                    402                 switch (ret) {
601                 case SECCOMP_RET_ERRNO:           403                 case SECCOMP_RET_ERRNO:
602                         /* Set the low-order 1    404                         /* Set the low-order 16-bits as a errno. */
603                         syscall_set_return_val !! 405                         syscall_set_return_value(current, task_pt_regs(current),
604                                                   406                                                  -data, 0);
605                         goto skip;                407                         goto skip;
606                 case SECCOMP_RET_TRAP:            408                 case SECCOMP_RET_TRAP:
607                         /* Show the handler th    409                         /* Show the handler the original registers. */
608                         syscall_rollback(curre !! 410                         syscall_rollback(current, task_pt_regs(current));
609                         /* Let the filter pass    411                         /* Let the filter pass back 16 bits of data. */
610                         seccomp_send_sigsys(th    412                         seccomp_send_sigsys(this_syscall, data);
611                         goto skip;                413                         goto skip;
612                 case SECCOMP_RET_TRACE:           414                 case SECCOMP_RET_TRACE:
613                         /* Skip these calls if    415                         /* Skip these calls if there is no tracer. */
614                         if (!ptrace_event_enab !! 416                         if (!ptrace_event_enabled(current, PTRACE_EVENT_SECCOMP))
615                                 syscall_set_re << 
616                                                << 
617                                 goto skip;        417                                 goto skip;
618                         }                      << 
619                         /* Allow the BPF to pr    418                         /* Allow the BPF to provide the event message */
620                         ptrace_event(PTRACE_EV    419                         ptrace_event(PTRACE_EVENT_SECCOMP, data);
621                         /*                        420                         /*
622                          * The delivery of a f    421                          * The delivery of a fatal signal during event
623                          * notification may si    422                          * notification may silently skip tracer notification.
624                          * Terminating the tas    423                          * Terminating the task now avoids executing a system
625                          * call that may not b    424                          * call that may not be intended.
626                          */                       425                          */
627                         if (fatal_signal_pendi    426                         if (fatal_signal_pending(current))
628                                 break;            427                                 break;
629                         if (syscall_get_nr(cur << 
630                                 goto skip;  /* << 
631                                                << 
632                         return 0;                 428                         return 0;
633                 case SECCOMP_RET_ALLOW:           429                 case SECCOMP_RET_ALLOW:
634                         return 0;                 430                         return 0;
635                 case SECCOMP_RET_KILL:            431                 case SECCOMP_RET_KILL:
636                 default:                          432                 default:
637                         break;                    433                         break;
638                 }                                 434                 }
639                 exit_sig = SIGSYS;                435                 exit_sig = SIGSYS;
640                 break;                            436                 break;
641         }                                         437         }
642 #endif                                            438 #endif
643         default:                                  439         default:
644                 BUG();                            440                 BUG();
645         }                                         441         }
646                                                   442 
647 #ifdef SECCOMP_DEBUG                              443 #ifdef SECCOMP_DEBUG
648         dump_stack();                             444         dump_stack();
649 #endif                                            445 #endif
650         audit_seccomp(this_syscall, exit_sig,     446         audit_seccomp(this_syscall, exit_sig, ret);
651         do_exit(exit_sig);                        447         do_exit(exit_sig);
652 #ifdef CONFIG_SECCOMP_FILTER                      448 #ifdef CONFIG_SECCOMP_FILTER
653 skip:                                             449 skip:
654         audit_seccomp(this_syscall, exit_sig,     450         audit_seccomp(this_syscall, exit_sig, ret);
655 #endif                                            451 #endif
656         return -1;                                452         return -1;
657 }                                                 453 }
658                                                   454 
659 long prctl_get_seccomp(void)                      455 long prctl_get_seccomp(void)
660 {                                                 456 {
661         return current->seccomp.mode;             457         return current->seccomp.mode;
662 }                                                 458 }
663                                                   459 
664 /**                                               460 /**
665  * seccomp_set_mode_strict: internal function  !! 461  * prctl_set_seccomp: configures current->seccomp.mode
666  *                                             !! 462  * @seccomp_mode: requested mode to use
667  * Once current->seccomp.mode is non-zero, it  !! 463  * @filter: optional struct sock_fprog for use with SECCOMP_MODE_FILTER
668  *                                                464  *
669  * Returns 0 on success or -EINVAL on failure. !! 465  * This function may be called repeatedly with a @seccomp_mode of
670  */                                            !! 466  * SECCOMP_MODE_FILTER to install additional filters.  Every filter
671 static long seccomp_set_mode_strict(void)      !! 467  * successfully installed will be evaluated (in reverse order) for each system
672 {                                              !! 468  * call the task makes.
673         const unsigned long seccomp_mode = SEC << 
674         long ret = -EINVAL;                    << 
675                                                << 
676         spin_lock_irq(&current->sighand->siglo << 
677                                                << 
678         if (!seccomp_may_assign_mode(seccomp_m << 
679                 goto out;                      << 
680                                                << 
681 #ifdef TIF_NOTSC                               << 
682         disable_TSC();                         << 
683 #endif                                         << 
684         seccomp_assign_mode(current, seccomp_m << 
685         ret = 0;                               << 
686                                                << 
687 out:                                           << 
688         spin_unlock_irq(&current->sighand->sig << 
689                                                << 
690         return ret;                            << 
691 }                                              << 
692                                                << 
693 #ifdef CONFIG_SECCOMP_FILTER                   << 
694 /**                                            << 
695  * seccomp_set_mode_filter: internal function  << 
696  * @flags:  flags to change filter behavior    << 
697  * @filter: struct sock_fprog containing filte << 
698  *                                             << 
699  * This function may be called repeatedly to i << 
700  * Every filter successfully installed will be << 
701  * for each system call the task makes.        << 
702  *                                                469  *
703  * Once current->seccomp.mode is non-zero, it     470  * Once current->seccomp.mode is non-zero, it may not be changed.
704  *                                                471  *
705  * Returns 0 on success or -EINVAL on failure.    472  * Returns 0 on success or -EINVAL on failure.
706  */                                               473  */
707 static long seccomp_set_mode_filter(unsigned i !! 474 long prctl_set_seccomp(unsigned long seccomp_mode, char __user *filter)
708                                     const char << 
709 {                                                 475 {
710         const unsigned long seccomp_mode = SEC << 
711         struct seccomp_filter *prepared = NULL << 
712         long ret = -EINVAL;                       476         long ret = -EINVAL;
713                                                   477 
714         /* Validate flags. */                  !! 478         if (current->seccomp.mode &&
715         if (flags & ~SECCOMP_FILTER_FLAG_MASK) !! 479             current->seccomp.mode != seccomp_mode)
716                 return -EINVAL;                << 
717                                                << 
718         /* Prepare the new filter before holdi << 
719         prepared = seccomp_prepare_user_filter << 
720         if (IS_ERR(prepared))                  << 
721                 return PTR_ERR(prepared);      << 
722                                                << 
723         /*                                     << 
724          * Make sure we cannot change seccomp  << 
725          * while another thread is in the midd << 
726          */                                    << 
727         if (flags & SECCOMP_FILTER_FLAG_TSYNC  << 
728             mutex_lock_killable(&current->sign << 
729                 goto out_free;                 << 
730                                                << 
731         spin_lock_irq(&current->sighand->siglo << 
732                                                << 
733         if (!seccomp_may_assign_mode(seccomp_m << 
734                 goto out;                      << 
735                                                << 
736         ret = seccomp_attach_filter(flags, pre << 
737         if (ret)                               << 
738                 goto out;                         480                 goto out;
739         /* Do not free the successfully attach << 
740         prepared = NULL;                       << 
741                                                << 
742         seccomp_assign_mode(current, seccomp_m << 
743 out:                                           << 
744         spin_unlock_irq(&current->sighand->sig << 
745         if (flags & SECCOMP_FILTER_FLAG_TSYNC) << 
746                 mutex_unlock(&current->signal- << 
747 out_free:                                      << 
748         seccomp_filter_free(prepared);         << 
749         return ret;                            << 
750 }                                              << 
751 #else                                          << 
752 static inline long seccomp_set_mode_filter(uns << 
753                                            con << 
754 {                                              << 
755         return -EINVAL;                        << 
756 }                                              << 
757 #endif                                         << 
758                                                << 
759 /* Common entry point for both prctl and sysca << 
760 static long do_seccomp(unsigned int op, unsign << 
761                        const char __user *uarg << 
762 {                                              << 
763         switch (op) {                          << 
764         case SECCOMP_SET_MODE_STRICT:          << 
765                 if (flags != 0 || uargs != NUL << 
766                         return -EINVAL;        << 
767                 return seccomp_set_mode_strict << 
768         case SECCOMP_SET_MODE_FILTER:          << 
769                 return seccomp_set_mode_filter << 
770         default:                               << 
771                 return -EINVAL;                << 
772         }                                      << 
773 }                                              << 
774                                                << 
775 SYSCALL_DEFINE3(seccomp, unsigned int, op, uns << 
776                          const char __user *,  << 
777 {                                              << 
778         return do_seccomp(op, flags, uargs);   << 
779 }                                              << 
780                                                << 
781 /**                                            << 
782  * prctl_set_seccomp: configures current->secc << 
783  * @seccomp_mode: requested mode to use        << 
784  * @filter: optional struct sock_fprog for use << 
785  *                                             << 
786  * Returns 0 on success or -EINVAL on failure. << 
787  */                                            << 
788 long prctl_set_seccomp(unsigned long seccomp_m << 
789 {                                              << 
790         unsigned int op;                       << 
791         char __user *uargs;                    << 
792                                                   481 
793         switch (seccomp_mode) {                   482         switch (seccomp_mode) {
794         case SECCOMP_MODE_STRICT:                 483         case SECCOMP_MODE_STRICT:
795                 op = SECCOMP_SET_MODE_STRICT;  !! 484                 ret = 0;
796                 /*                             !! 485 #ifdef TIF_NOTSC
797                  * Setting strict mode through !! 486                 disable_TSC();
798                  * so make sure it is always N !! 487 #endif
799                  * check in do_seccomp().      << 
800                  */                            << 
801                 uargs = NULL;                  << 
802                 break;                            488                 break;
                                                   >> 489 #ifdef CONFIG_SECCOMP_FILTER
803         case SECCOMP_MODE_FILTER:                 490         case SECCOMP_MODE_FILTER:
804                 op = SECCOMP_SET_MODE_FILTER;  !! 491                 ret = seccomp_attach_user_filter(filter);
805                 uargs = filter;                !! 492                 if (ret)
                                                   >> 493                         goto out;
806                 break;                            494                 break;
                                                   >> 495 #endif
807         default:                                  496         default:
808                 return -EINVAL;                !! 497                 goto out;
809         }                                         498         }
810                                                   499 
811         /* prctl interface doesn't have flags, !! 500         current->seccomp.mode = seccomp_mode;
812         return do_seccomp(op, 0, uargs);       !! 501         set_thread_flag(TIF_SECCOMP);
                                                   >> 502 out:
                                                   >> 503         return ret;
813 }                                                 504 }
814                                                   505 

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