From: zhenwei pi pizhenwei@bytedance.com

stable inclusion from linux-4.19.207 commit aab312696d37de80502ca633b40184de24f22917

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commit f985911b7bc75d5c98ed24d8aaa8b94c590f7c6a upstream.

Hit kernel warning like this, it can be reproduced by verifying 256 bytes datafile by keyctl command, run script: RAWDATA=rawdata SIGDATA=sigdata

modprobe pkcs8_key_parser

rm -rf *.der *.pem *.pfx rm -rf $RAWDATA dd if=/dev/random of=$RAWDATA bs=256 count=1

openssl req -nodes -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem \ -subj "/C=CN/ST=GD/L=SZ/O=vihoo/OU=dev/CN=xx.com/emailAddress=yy@xx.com"

KEY_ID=`openssl pkcs8 -in key.pem -topk8 -nocrypt -outform DER | keyctl \ padd asymmetric 123 @s`

keyctl pkey_sign $KEY_ID 0 $RAWDATA enc=pkcs1 hash=sha1 > $SIGDATA keyctl pkey_verify $KEY_ID 0 $RAWDATA $SIGDATA enc=pkcs1 hash=sha1

Then the kernel reports: WARNING: CPU: 5 PID: 344556 at crypto/rsa-pkcs1pad.c:540 pkcs1pad_verify+0x160/0x190 ... Call Trace: public_key_verify_signature+0x282/0x380 ? software_key_query+0x12d/0x180 ? keyctl_pkey_params_get+0xd6/0x130 asymmetric_key_verify_signature+0x66/0x80 keyctl_pkey_verify+0xa5/0x100 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae

The reason of this issue, in function 'asymmetric_key_verify_signature': '.digest_size(u8) = params->in_len(u32)' leads overflow of an u8 value, so use u32 instead of u8 for digest_size field. And reorder struct public_key_signature, it saves 8 bytes on a 64-bit machine.

Cc: stable@vger.kernel.org Signed-off-by: zhenwei pi pizhenwei@bytedance.com Reviewed-by: Jarkko Sakkinen jarkko@kernel.org Signed-off-by: Jarkko Sakkinen jarkko@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- include/crypto/public_key.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index e0b681a717bac..052e26fda2e6c 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -35,9 +35,9 @@ extern void public_key_free(struct public_key *key); struct public_key_signature { struct asymmetric_key_id *auth_ids[2]; u8 *s; /* Signature */ - u32 s_size; /* Number of bytes in signature */ u8 *digest; - u8 digest_size; /* Number of bytes in digest */ + u32 s_size; /* Number of bytes in signature */ + u32 digest_size; /* Number of bytes in digest */ const char *pkey_algo; const char *hash_algo; };