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authorOleg Nesterov <oleg@redhat.com>2009-07-10 03:27:40 +0200
committerJames Morris <jmorris@namei.org>2009-08-10 20:49:26 +1000
commit704b836cbf19e885f8366bccb2e4b0474346c02d (patch)
treed0513d3ef70e1b875cd7786f94150ba2428b6a88 /Documentation/cris
parent00f89d218523b9bf6b522349c039d5ac80aa536d (diff)
mm_for_maps: take ->cred_guard_mutex to fix the race with exec
The problem is minor, but without ->cred_guard_mutex held we can race with exec() and get the new ->mm but check old creds. Now we do not need to re-check task->mm after ptrace_may_access(), it can't be changed to the new mm under us. Strictly speaking, this also fixes another very minor problem. Unless security check fails or the task exits mm_for_maps() should never return NULL, the caller should get either old or new ->mm. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
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