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seccomp: Stub for !CONFIG_SECCOMP

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When using !CONFIG_SECCOMP with CONFIG_GENERIC_ENTRY, the
randconfig bots found the following snag:

   kernel/entry/common.c: In function 'syscall_trace_enter':
>> kernel/entry/common.c:52:23: error: implicit declaration
   of function '__secure_computing' [-Wimplicit-function-declaration]
      52 |                 ret = __secure_computing(NULL);
         |                       ^~~~~~~~~~~~~~~~~~

Since generic entry calls __secure_computing() unconditionally,
fix this by moving the stub out of the ifdef clause for
CONFIG_HAVE_ARCH_SECCOMP_FILTER so it's always available.

Link: https://lore.kernel.org/oe-kbuild-all/202501061240.Fzk9qiFZ-lkp@intel.com/
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250108-seccomp-stub-2-v2-1-74523d49420f@linaro.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Linus Walleij 2025-01-08 23:44:45 +01:00 committed by Kees Cook
parent fac04efc5c
commit f90877dd7f
1 changed files with 1 additions and 1 deletions
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2
include/linux/seccomp.h
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@ -55,10 +55,10 @@ struct seccomp_data;
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
static inline int secure_computing(void) { return 0; }
static inline int __secure_computing(const struct seccomp_data *sd) { return 0; }
#else
static inline void secure_computing_strict(int this_syscall) { return; }
#endif
static inline int __secure_computing(const struct seccomp_data *sd) { return 0; }
static inline long prctl_get_seccomp(void)
{