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Make seccomp-bpf sandbox work on Linux/X32

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Allow clock_gettime syscall with X32 bit masked off. Apparently
this is required for at least some kernel versions. bz#2142
Patch mostly by Colin Watson. ok dtucker@
This commit is contained in:
Damien Miller 2017-03-14 18:26:29 +11:00
parent 2429cf78dd
commit f86586b03f
1 changed files with 9 additions and 1 deletions
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10
sandbox-seccomp-filter.c
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@ -228,7 +228,15 @@ static const struct sock_filter preauth_insns[] = {
SC_ALLOW_ARG(__NR_ioctl, 1, Z90STAT_STATUS_MASK),
SC_ALLOW_ARG(__NR_ioctl, 1, ICARSAMODEXPO),
SC_ALLOW_ARG(__NR_ioctl, 1, ICARSACRT),
#endif /* defined(__NR_ioctl) && defined(__s390__) */
#endif
#if defined(__x86_64__) && defined(__ILP32__) && defined(__X32_SYSCALL_BIT)
/*
* On Linux x32, the clock_gettime VDSO falls back to the
* x86-64 syscall under some circumstances, e.g.
* https://bugs.debian.org/849923
*/
SC_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT);
#endif
/* Default deny */
BPF_STMT(BPF_RET+BPF_K, SECCOMP_FILTER_FAIL),