diff options
| author | John Johansen <john.johansen@canonical.com> | 2011-06-28 15:06:38 +0100 |
|---|---|---|
| committer | Jonas ABERG <jonas.aberg@stericsson.com> | 2011-10-28 11:15:57 +0200 |
| commit | 3ea95d46ec44fd8d2eba9bd065d1203f09158bef (patch) | |
| tree | 7c9edac34445969c1cd51c703e8e8b4dcd5263f2 | |
| parent | 15498c389ee7534b7b2828ee40eb5efad0b8f037 (diff) | |
AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock
commit 04fdc099f9c80c7775dbac388fc97e156d4d47e7 upstream.
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>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Change-Id: I4ce729d8fbcf307c21c65819333ee3a931581d3f
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/35670
Tested-by: Per VAHLNE <per.xx.vahlne@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
| -rw-r--r-- | security/apparmor/domain.c | 2 |
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); |