From 338d0be437ef10e247a35aed83dbab182cf406a2 Mon Sep 17 00:00:00 2001 From: John Johansen Date: Thu, 7 Jun 2018 00:45:30 -0700 Subject: [PATCH] apparmor: fix ptrace read check The ptrace read check is incorrect resulting in policy that is broader than it needs to be. Fix the check so that read access permission can be properly detected when other ptrace flags are set. Fixes: b2d09ae449ce ("apparmor: move ptrace checks to using labels") Signed-off-by: John Johansen --- security/apparmor/lsm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index e35d12883990..74f17376202b 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -117,7 +117,8 @@ static int apparmor_ptrace_access_check(struct task_struct *child, tracer = begin_current_label_crit_section(); tracee = aa_get_task_label(child); error = aa_may_ptrace(tracer, tracee, - mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE); + (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ + : AA_PTRACE_TRACE); aa_put_label(tracee); end_current_label_crit_section(tracer);