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author | Oleg Nesterov <oleg@redhat.com> | 2009-07-10 03:27:40 +0200 |
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committer | James Morris <jmorris@namei.org> | 2009-08-10 20:49:26 +1000 |
commit | 704b836cbf19e885f8366bccb2e4b0474346c02d (patch) | |
tree | d0513d3ef70e1b875cd7786f94150ba2428b6a88 /README | |
parent | 00f89d218523b9bf6b522349c039d5ac80aa536d (diff) | |
download | linux-3.10-704b836cbf19e885f8366bccb2e4b0474346c02d.tar.gz linux-3.10-704b836cbf19e885f8366bccb2e4b0474346c02d.tar.bz2 linux-3.10-704b836cbf19e885f8366bccb2e4b0474346c02d.zip |
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>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions