linux-kernel - [PATCH] crypto: Prevent kernel-infoleak in rng

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Message-ID: <tencent_B406618996EEF22ED6CC8EA7DF46FD92D206@qq.com>
Date: Sat,  9 Aug 2025 17:59:43 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+e8bcd7ee3db6cb5cb875@...kaller.appspotmail.com
Cc: davem@...emloft.net,
	herbert@...dor.apana.org.au,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] crypto: Prevent kernel-infoleak in rng_recvmsg

Initialize the intermediary array member to 0 to prevent the kernel from
leaking uninitialized data to user space.

Reported-by: syzbot+e8bcd7ee3db6cb5cb875@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=e8bcd7ee3db6cb5cb875
Tested-by: syzbot+e8bcd7ee3db6cb5cb875@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 crypto/jitterentropy-kcapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/jitterentropy-kcapi.c b/crypto/jitterentropy-kcapi.c
index c24d4ff2b4a8..9e9e069f55af 100644
--- a/crypto/jitterentropy-kcapi.c
+++ b/crypto/jitterentropy-kcapi.c
@@ -107,7 +107,7 @@ int jent_hash_time(void *hash_state, __u64 time, u8 *addtl,
 {
 	struct shash_desc *hash_state_desc = (struct shash_desc *)hash_state;
 	SHASH_DESC_ON_STACK(desc, hash_state_desc->tfm);
-	u8 intermediary[SHA3_256_DIGEST_SIZE];
+	u8 intermediary[SHA3_256_DIGEST_SIZE] = { 0 };
 	__u64 j = 0;
 	int ret;
 
-- 
2.43.0