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Date: Tue, 20 Feb 2024 06:42:18 -0800
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Subject: [syzbot] [crypto?] KMSAN: uninit-value in des3_ede_decrypt
From: syzbot <syzbot+b90b904ef6bdfdafec1d@syzkaller.appspotmail.com>
To: davem@davemloft.net, herbert@gondor.apana.org.au, 
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, 
	syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    4f5e5092fdbf Merge tag 'net-6.8-rc5' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1679e7b2180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e3dd779fba027968
dashboard link: https://syzkaller.appspot.com/bug?extid=b90b904ef6bdfdafec1d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/34924e0466d4/disk-4f5e5092.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/29d0b1935c61/vmlinux-4f5e5092.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2e033c3d8679/bzImage-4f5e5092.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b90b904ef6bdfdafec1d@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in des3_ede_decrypt+0x845/0x19a0 lib/crypto/des.c:884
 des3_ede_decrypt+0x845/0x19a0 lib/crypto/des.c:884
 crypto_des3_ede_decrypt+0x32/0x40 crypto/des_generic.c:82
 crypto_ecb_crypt crypto/ecb.c:23 [inline]
 crypto_ecb_decrypt2+0x18b/0x2f0 crypto/ecb.c:51
 crypto_lskcipher_crypt+0x66d/0x750 crypto/lskcipher.c:160
 crypto_lskcipher_decrypt+0x82/0xb0 crypto/lskcipher.c:194
 crypto_cbc_decrypt_inplace crypto/cbc.c:108 [inline]
 crypto_cbc_decrypt+0x4df/0x8e0 crypto/cbc.c:131
 crypto_lskcipher_crypt_sg+0x43f/0x930 crypto/lskcipher.c:229
 crypto_lskcipher_decrypt_sg+0x8a/0xc0 crypto/lskcipher.c:258
 crypto_skcipher_decrypt+0x10d/0x1c0 crypto/skcipher.c:693
 cts_cbc_decrypt+0x51b/0x720 crypto/cts.c:219
 crypto_cts_decrypt+0x77f/0x9b0 crypto/cts.c:280
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 memcpy_dir crypto/scatterwalk.c:23 [inline]
 scatterwalk_copychunks crypto/scatterwalk.c:38 [inline]
 scatterwalk_map_and_copy+0x6dc/0x9a0 crypto/scatterwalk.c:67
 cts_cbc_decrypt+0x3e2/0x720 crypto/cts.c:211
 crypto_cts_decrypt+0x77f/0x9b0 crypto/cts.c:280
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 cts_cbc_decrypt+0x3a3/0x720 crypto/cts.c:208
 crypto_cts_decrypt+0x77f/0x9b0 crypto/cts.c:280
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 __crypto_xor+0x171/0x1310 lib/crypto/utils.c:45
 crypto_xor include/crypto/utils.h:31 [inline]
 cts_cbc_decrypt+0x2da/0x720 crypto/cts.c:199
 crypto_cts_decrypt+0x77f/0x9b0 crypto/cts.c:280
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 memcpy_dir crypto/scatterwalk.c:23 [inline]
 scatterwalk_copychunks crypto/scatterwalk.c:38 [inline]
 scatterwalk_map_and_copy+0x6dc/0x9a0 crypto/scatterwalk.c:67
 cts_cbc_decrypt+0x1b9/0x720 crypto/cts.c:197
 crypto_cts_decrypt+0x77f/0x9b0 crypto/cts.c:280
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 __crypto_xor+0x171/0x1310 lib/crypto/utils.c:45
 crypto_xor include/crypto/utils.h:31 [inline]
 crypto_cbc_decrypt_segment crypto/cbc.c:81 [inline]
 crypto_cbc_decrypt+0x2b1/0x8e0 crypto/cbc.c:133
 crypto_lskcipher_crypt_sg+0x43f/0x930 crypto/lskcipher.c:229
 crypto_lskcipher_decrypt_sg+0x8a/0xc0 crypto/lskcipher.c:258
 crypto_skcipher_decrypt+0x10d/0x1c0 crypto/skcipher.c:693
 crypto_cts_decrypt+0x704/0x9b0 crypto/cts.c:279
 crypto_skcipher_decrypt+0x189/0x1c0 crypto/skcipher.c:695
 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline]
 skcipher_recvmsg+0x1691/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:3819 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc+0x919/0xf80 mm/slub.c:3994
 kmalloc include/linux/slab.h:594 [inline]
 sock_kmalloc+0x134/0x1f0 net/core/sock.c:2685
 af_alg_alloc_areq+0xe4/0x3a0 crypto/af_alg.c:1202
 _skcipher_recvmsg crypto/algif_skcipher.c:118 [inline]
 skcipher_recvmsg+0x4f0/0x2190 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 ____sys_recvmsg+0x283/0x7f0 net/socket.c:2803
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 0 PID: 11510 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-00180-g4f5e5092fdbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================


---
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