linux-kernel - [PATCH AUTOSEL 4.19 37/47] smackfs: use __GFP_NOFAIL for smk_cipso

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Message-Id: <20211108175031.1190422-37-sashal@kernel.org>
Date:   Mon,  8 Nov 2021 12:50:21 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        syzbot <syzbot+89731ccb6fec15ce1c22@...kaller.appspotmail.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Sasha Levin <sashal@...nel.org>, jmorris@...ei.org,
        serge@...lyn.com, linux-security-module@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 37/47] smackfs: use __GFP_NOFAIL for smk_cipso_doi()

From: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>

[ Upstream commit f91488ee15bd3cac467e2d6a361fc2d34d1052ae ]

syzbot is reporting kernel panic at smk_cipso_doi() due to memory
allocation fault injection [1]. The reason for need to use panic() was
not explained. But since no fix was proposed for 18 months, for now
let's use __GFP_NOFAIL for utilizing syzbot resource on other bugs.

Link: https://syzkaller.appspot.com/bug?extid=89731ccb6fec15ce1c22 [1]
Reported-by: syzbot <syzbot+89731ccb6fec15ce1c22@...kaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/smack/smackfs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 25705a72d31bc..9fdf404a318f9 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -721,9 +721,7 @@ static void smk_cipso_doi(void)
 		printk(KERN_WARNING "%s:%d remove rc = %d\n",
 		       __func__, __LINE__, rc);
 
-	doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
-	if (doip == NULL)
-		panic("smack:  Failed to initialize cipso DOI.\n");
+	doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
 	doip->map.std = NULL;
 	doip->doi = smk_cipso_doi_value;
 	doip->type = CIPSO_V4_MAP_PASS;
-- 
2.33.0