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authorAndrea Arcangeli <andrea@cpushare.com>2005-09-09 13:01:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 13:57:30 -0700
commit4c7fc7220f6a3cce9b3f4bd66362176df67df577 (patch)
tree5824a334335dcc283a76ffad6294ed0904364157 /arch/alpha
parent4d666d7ada2e14d71d463c85b8b5ef2e2e6723f2 (diff)
[PATCH] i386: seccomp fix for auditing/ptrace
This is the same issue as ppc64 before, when returning to userland we shouldn't re-compute the seccomp check or the task could be killed during sigreturn when orig_eax is overwritten by the sigreturn syscall. This was found by Roland. This was harmless from a security standpoint, but some i686 users reported failures with auditing enabled system wide (some distro surprisingly makes it the default) and I reproduced it too by keeping the whole workload under strace -f. Patch is tested and works for me under strace -f. nobody@athlon:~/cpushare> strace -o /tmp/o -f python seccomp_test.py make: Nothing to be done for `seccomp_test'. Starting computing some malicious bytecode init load start stop receive_data failure kill exit_code 0 signal 9 The malicious bytecode has been killed successfully by seccomp Starting computing some safe bytecode init load start stop 174 counts kill exit_code 0 signal 0 The seccomp_test.py completed successfully, thank you for testing. (akpm: collaterally cleaned up a bit of do_syscall_trace() too) Signed-off-by: Andrea Arcangeli <andrea@cpushare.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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