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authorEric W. Biederman <ebiederm@xmission.com>2013-03-21 02:30:41 -0700
committerEric W. Biederman <ebiederm@xmission.com>2013-03-26 13:17:58 -0700
commiteddc0a3abff273842a94784d2d022bbc36dc9015 (patch)
treed1d4eea461dbd3b32e09079f00fccac6fde07e2c /security
parent751c644b95bb48aaa8825f0c66abbcc184d92051 (diff)
downloadlinux-linaro-stable-eddc0a3abff273842a94784d2d022bbc36dc9015.tar.gz
yama: Better permission check for ptraceme
Change the permission check for yama_ptrace_ptracee to the standard ptrace permission check, testing if the traceer has CAP_SYS_PTRACE in the tracees user namespace. Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'security')
-rw-r--r--security/yama/yama_lsm.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 23414b93771f..13c88fbcf037 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -347,10 +347,8 @@ int yama_ptrace_traceme(struct task_struct *parent)
/* Only disallow PTRACE_TRACEME on more aggressive settings. */
switch (ptrace_scope) {
case YAMA_SCOPE_CAPABILITY:
- rcu_read_lock();
- if (!ns_capable(__task_cred(parent)->user_ns, CAP_SYS_PTRACE))
+ if (!has_ns_capability(parent, current_user_ns(), CAP_SYS_PTRACE))
rc = -EPERM;
- rcu_read_unlock();
break;
case YAMA_SCOPE_NO_ATTACH:
rc = -EPERM;