linux-kernel - [PATCH] Yama: use atomic allocations when reporting

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Date:	Wed,  4 May 2016 10:18:15 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	james.l.morris@...cle.com, serge@...lyn.com
Cc:	keescook@...omium.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] Yama: use atomic allocations when reporting

Access reporting often happens from atomic contexes. Avoid
lockups when allocating memory for command lines.

Fixes: 8a56038c2ae ("Yama: consolidate error reporting")
Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 security/yama/yama_lsm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index c19f6e5..9b756b1 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -47,8 +47,8 @@ static void report_access(const char *access, struct task_struct *target,
 {
 	char *target_cmd, *agent_cmd;
 
-	target_cmd = kstrdup_quotable_cmdline(target, GFP_KERNEL);
-	agent_cmd = kstrdup_quotable_cmdline(agent, GFP_KERNEL);
+	target_cmd = kstrdup_quotable_cmdline(target, GFP_ATOMIC);
+	agent_cmd = kstrdup_quotable_cmdline(agent, GFP_ATOMIC);
 
 	pr_notice_ratelimited(
 		"ptrace %s of \"%s\"[%d] was attempted by \"%s\"[%d]\n",
-- 
1.9.1