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SubjectRe: [PATCH] CRED: Take cred_exec_mutex in compat_do_execve() and fix error handling in do_execve()
> Applied to
> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next-creds
>
> Hopefully this will be in the next linux-next tree for testing.
>
> Alexander, please let us know if it fixes the problem you saw.

Yes, it seems fixed.
David, there is one more problem.

2.6.27-rc3-next-20080820:

[ 22.266394] [ BUG: bad unlock balance detected! ]
[ 22.266495] -------------------------------------
[ 22.266594] khelper/8 is trying to release lock (&p->cred_exec_mutex) at:
[ 22.266775] [<00000000006af9f8>] mutex_unlock+0x10/0x20
[ 22.266881] but there are no more locks to release!
[ 22.266982]
[ 22.266987] other info that might help us debug this:
[ 22.267136] no locks held by khelper/8.
[ 22.267224]
[ 22.267229] stack backtrace:
[ 22.267343] Call Trace:
[ 22.267436] [000000000047800c] print_unlock_inbalance_bug+0xe8/0xf8
[ 22.267569] [0000000000478338] lock_release+0x98/0x1ac
[ 22.267685] [00000000006af954] __mutex_unlock_slowpath+0xbc/0x150
[ 22.267816] [00000000006af9f8] mutex_unlock+0x10/0x20
[ 22.267931] [00000000004b81fc] free_bprm+0x1c/0x3c
[ 22.268043] [00000000004b93d4] do_execve+0x230/0x254
[ 22.268158] [00000000004273d8] sparc_execve+0x64/0xb0
[ 22.268284] [0000000000406194] linux_sparc_syscall+0x34/0x44
[ 22.268407] [0000000000432cf0] kernel_execve+0x20/0x34
[ 22.268535] [0000000000462fa8] ____call_usermodehelper+0xf4/0x10c
[ 22.268661] [0000000000427260] kernel_thread+0x3c/0x54
[ 22.268779] [0000000000462e7c] __call_usermodehelper+0x7c/0xb4


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