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Sun, 14 Jun 2026 19:10:27 -0700 (PDT) Received: from localhost.localdomain ([2601:985:4601:5df0:2106:6ce9:6b1:8f70]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-517fb61d948sm89064731cf.1.2026.06.14.19.10.26 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 14 Jun 2026 19:10:26 -0700 (PDT) From: Shuangpeng Bai To: arei.gonglei@huawei.com, mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, virtualization@lists.linux.dev, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] crypto: virtio - KASAN slab-use-after-free in virtio_crypto_skcipher_encrypt Date: Sun, 14 Jun 2026 22:10:25 -0400 Message-ID: <178144969601.60470.4893281262514662497@gmail.com> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi, I hit the following KASAN report while testing current upstream kernel. The issue was reproduced by queuing an AF_ALG skcipher request backed by virtio-crypto, unbinding virtio0 from the virtio_crypto driver, and then receiving from the old AF_ALG op fd. KASAN: slab-use-after-free in virtio_crypto_skcipher_encrypt I reproduced this on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026) The reproducer and .config files are here. https://gist.github.com/shuangpengbai/f6117a0883dd574f02288ca812bb7d65 I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 54.367992][ T8332] BUG: KASAN: slab-use-after-free in virtio_crypto_skcipher_encrypt (drivers/crypto/virtio/virtio_crypto_skcipher_algs.c:473) [ 54.369596][ T8332] Read of size 8 at addr ffff888124a47010 by task virtio_crypto_a/8332 [ 54.370922][ T8332] [ 54.371171][ T8332] Tainted: [W]=WARN [ 54.371172][ T8332] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 54.371175][ T8332] Call Trace: [ 54.371179][ T8332] [ 54.371181][ T8332] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 54.371188][ T8332] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 54.371202][ T8332] kasan_report (mm/kasan/report.c:595) [ 54.371213][ T8332] virtio_crypto_skcipher_encrypt (drivers/crypto/virtio/virtio_crypto_skcipher_algs.c:473) [ 54.371216][ T8332] skcipher_recvmsg (crypto/algif_skcipher.c:203 crypto/algif_skcipher.c:226) [ 54.371249][ T8332] sock_recvmsg (net/socket.c:1137 net/socket.c:1159) [ 54.371253][ T8332] __sys_recvfrom (net/socket.c:2315) [ 54.371273][ T8332] __x64_sys_recvfrom (net/socket.c:2330 net/socket.c:2326 net/socket.c:2326) [ 54.371277][ T8332] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 54.371281][ T8332] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 54.371285][ T8332] RIP: 0033:0x7f3c6caaac2c [ 54.371289][ T8332] Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 19 45 31 c9 45 31 c0 b8 2d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 64 c3 0f 1f 00 55 48 83 ec 20 48 89 54 24 10 [ 54.371292][ T8332] RSP: 002b:00007ffed3785308 EFLAGS: 00000246 ORIG_RAX: 000000000000002d [ 54.371297][ T8332] RAX: ffffffffffffffda RBX: 0000000000000064 RCX: 00007f3c6caaac2c [ 54.371299][ T8332] RDX: 0000000000000040 RSI: 00007ffed37853a0 RDI: 0000000000000004 [ 54.371301][ T8332] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 54.371303][ T8332] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 54.371305][ T8332] R13: 00007ffed37853a0 R14: 0000558cc9904118 R15: 0000000000000000 [ 54.371309][ T8332] [ 54.371311][ T8332] [ 54.394932][ T8332] Freed by task 8332 on cpu 0 at 54.364772s: [ 54.395528][ T8332] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 54.395997][ T8332] kasan_save_free_info (mm/kasan/generic.c:584) [ 54.396501][ T8332] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 54.396983][ T8332] kfree (include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) [ 54.397378][ T8332] virtio_dev_remove (drivers/virtio/virtio.c:375) [ 54.397869][ T8332] device_release_driver_internal (drivers/base/dd.c:619 drivers/base/dd.c:1352 drivers/base/dd.c:1375) [ 54.398475][ T8332] unbind_store (drivers/base/bus.c:244) [ 54.398944][ T8332] kernfs_fop_write_iter (fs/kernfs/file.c:352) [ 54.399476][ T8332] vfs_write (fs/read_write.c:595 fs/read_write.c:688) [ 54.399915][ T8332] ksys_write (fs/read_write.c:740) [ 54.400349][ T8332] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 54.400818][ T8332] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 54.401406][ T8332] [ 54.401650][ T8332] The buggy address belongs to the object at ffff888124a47000 [ 54.401650][ T8332] which belongs to the cache kmalloc-192 of size 192 [ 54.403038][ T8332] The buggy address is located 16 bytes inside of [ 54.403038][ T8332] freed 192-byte region [ffff888124a47000, ffff888124a470c0) [ 54.404385][ T8332] Best, Shuangpeng