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| author | Jann Horn <jannh@google.com> | 2018-09-29 04:49:26 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2020-06-30 22:37:57 +0300 |
| commit | ecf8e185a29ab1d71ad5a4f22ddc84bdce6cb5ed (patch) | |
| tree | b2d61f5d9b1aeae5c61d57abe9e8a87eafd13098 /security | |
| parent | 1180e365f0990dbc83eed1e64041fff614cb3d70 (diff) | |
| download | linux-ecf8e185a29ab1d71ad5a4f22ddc84bdce6cb5ed.tar.xz | |
apparmor: don't try to replace stale label in ptraceme check
[ Upstream commit ca3fde5214e1d24f78269b337d3f22afd6bf445e ]
begin_current_label_crit_section() must run in sleepable context because
when label_is_stale() is true, aa_replace_current_label() runs, which uses
prepare_creds(), which can sleep.
Until now, the ptraceme access check (which runs with tasklist_lock held)
violated this rule.
Fixes: b2d09ae449ced ("apparmor: move ptrace checks to using labels")
Reported-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/apparmor/lsm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 4f08023101f3..1c6b389ad8f9 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -123,11 +123,11 @@ static int apparmor_ptrace_traceme(struct task_struct *parent) struct aa_label *tracer, *tracee; int error; - tracee = begin_current_label_crit_section(); + tracee = __begin_current_label_crit_section(); tracer = aa_get_task_label(parent); error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); aa_put_label(tracer); - end_current_label_crit_section(tracee); + __end_current_label_crit_section(tracee); return error; } |