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authorOleg Nesterov <oleg@redhat.com>2009-04-24 01:02:45 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-24 07:39:45 -0700
commit437f7fdb607f32b737e4da9f14bebcfdac2c90c3 (patch)
tree2064149ad4406774bd3b1ade60782980206f2e82 /include/linux/cdrom.h
parent8c652f96d3852b97a49c331cd0bb02d22f3cb31b (diff)
check_unsafe_exec: s/lock_task_sighand/rcu_read_lock/
write_lock(&current->fs->lock) guarantees we can't wrongly miss LSM_UNSAFE_SHARE, this is what we care about. Use rcu_read_lock() instead of ->siglock to iterate over the sub-threads. We must see all CLONE_THREAD|CLONE_FS threads which didn't pass exit_fs(), it takes fs->lock too. With or without this patch we can miss the freshly cloned thread and set LSM_UNSAFE_SHARE, we don't care. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Roland McGrath <roland@redhat.com> [ Fixed lock/unlock typo - Hugh ] Acked-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/cdrom.h')
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