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improve sandbox stability

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valoq 2022-11-29 14:58:50 +01:00
parent aa5f419a1a
commit 3bfe1ebabc
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1 changed files with 14 additions and 1 deletions
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15
zathura/seccomp-filters.c
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@ -31,6 +31,7 @@
#define DENY_RULE(call) ADD_RULE("kill", SCMP_ACT_KILL, call, 0)
#define ALLOW_RULE(call) ADD_RULE("allow", SCMP_ACT_ALLOW, call, 0)
#define ERRNO_RULE(call) ADD_RULE("errno", SCMP_ACT_ERRNO(ENOSYS), call, 0)
int
seccomp_enable_basic_filter(void)
@ -242,6 +243,18 @@ seccomp_enable_strict_filter(zathura_t* zathura)
ALLOW_RULE(timer_create);
ALLOW_RULE(timer_delete);
/* Gracefully fail syscalls that may be used by dependencies in the future
These rules will still block the syscalls but since there usually is fallback code
for new syscalls, it will not shut down zathura and give us more time to
analyse the newly required syscall before potentionally allowing it.
*/
ERRNO_RULE(openat2);
ERRNO_RULE(faccessat2);
ERRNO_RULE(pwritev2);
#ifdef __NR_readfile
ERRNO_RULE(readfile);
#endif
/* Permit X11 specific syscalls */
#ifdef GDK_WINDOWING_X11
@ -284,7 +297,7 @@ seccomp_enable_strict_filter(zathura_t* zathura)
CLONE_PARENT_SETTID | \
CLONE_CHILD_CLEARTID));
/* trigger fallback to clone */
ADD_RULE("errno", SCMP_ACT_ERRNO(ENOSYS), clone3, 0);
ERRNO_RULE(clone3);
/* fcntl filter - not yet working */
/*ADD_RULE("allow", SCMP_ACT_ALLOW, fcntl, 1, SCMP_CMP(0, SCMP_CMP_EQ, \