linux-kernel - [syzbot] [crypto?] KMSAN: uninit-value in aes

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Date: Wed, 28 Feb 2024 01:11:23 -0800
From: syzbot <syzbot+b6ce97de27db385d5cd7@...kaller.appspotmail.com>
To: davem@...emloft.net, herbert@...dor.apana.org.au, 
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [crypto?] KMSAN: uninit-value in aes_decrypt

Hello,

syzbot found the following issue on:

HEAD commit:    603c04e27c3e Merge tag 'parisc-for-6.8-rc6' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12bc1372180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1b015d567058472
dashboard link: https://syzkaller.appspot.com/bug?extid=b6ce97de27db385d5cd7
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6aa7d0a5141b/disk-603c04e2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2578a4f15ecb/vmlinux-603c04e2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1d54b85566c3/bzImage-603c04e2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b6ce97de27db385d5cd7@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in inv_subshift lib/crypto/aes.c:158 [inline]
BUG: KMSAN: uninit-value in aes_decrypt+0x173d/0x1f20 lib/crypto/aes.c:333
 inv_subshift lib/crypto/aes.c:158 [inline]
 aes_decrypt+0x173d/0x1f20 lib/crypto/aes.c:333
 aesti_decrypt+0x7d/0xf0 crypto/aes_ti.c:47
 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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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:2684
 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+0x7a/0x120 net/socket.c:1046
 ____sys_recvmsg+0x664/0x7f0 net/socket.c:2801
 ___sys_recvmsg+0x223/0x840 net/socket.c:2845
 do_recvmmsg+0x627/0xfd0 net/socket.c:2931
 __sys_recvmmsg+0x10a/0x430 net/socket.c:3018
 __do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
 __se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
 __ia32_compat_sys_recvmmsg_time32+0xf5/0x180 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
 entry_SYSENTER_compat_after_hwframe+0x70/0x7a

CPU: 1 PID: 11951 Comm: syz-executor.1 Not tainted 6.8.0-rc5-syzkaller-00278-g603c04e27c3e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================


---
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