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authorJohn Johansen <john.johansen@canonical.com>2011-06-28 15:06:38 +0100
committerJohn Johansen <john.johansen@canonical.com>2011-06-29 02:02:03 +0100
commit04fdc099f9c80c7775dbac388fc97e156d4d47e7 (patch)
tree886a4176abfe4a4c4e3ee7b62da520914bf666e0 /security
parentb0af8dfdd67699e25083478c63eedef2e72ebd85 (diff)
downloadlinux-linaro-precise-04fdc099f9c80c7775dbac388fc97e156d4d47e7.tar.gz
AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock
The pointer returned from tracehook_tracer_task() is only valid inside the rcu_read_lock. However the tracer pointer obtained is being passed to aa_may_ptrace outside of the rcu_read_lock critical section. Mover the aa_may_ptrace test into the rcu_read_lock critical section, to fix this. Kernels affected: 2.6.36 - 3.0 Reported-by: Oleg Nesterov <oleg@redhat.com> Cc: stable@kernel.org Signed-off-by: John Johansen <john.johansen@canonical.com>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/domain.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index c825c6e0b63..78adc4303ef 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -73,7 +73,6 @@ static int may_change_ptraced_domain(struct task_struct *task,
cred = get_task_cred(tracer);
tracerp = aa_cred_profile(cred);
}
- rcu_read_unlock();
/* not ptraced */
if (!tracer || unconfined(tracerp))
@@ -82,6 +81,7 @@ static int may_change_ptraced_domain(struct task_struct *task,
error = aa_may_ptrace(tracer, tracerp, to_profile, PTRACE_MODE_ATTACH);
out:
+ rcu_read_unlock();
if (cred)
put_cred(cred);