Hello, syzbot found the following issue on: HEAD commit: 6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14a181a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b6003cf8ecb92ff2 dashboard link: https://syzkaller.appspot.com/bug?extid=e8bcd7ee3db6cb5cb875 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117fa1a2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105e9058580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3d9a1192a7cc/disk-6e64f458.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8f363fe8f54a/vmlinux-6e64f458.xz kernel image: https://storage.googleapis.com/syzbot-assets/10b73833a575/bzImage-6e64f458.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e8bcd7ee3db6cb5cb875@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:300 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:328 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xf0e/0x33f0 lib/iov_iter.c:185 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0xf0e/0x33f0 lib/iov_iter.c:185 copy_to_iter include/linux/uio.h:220 [inline] memcpy_to_msg include/linux/skbuff.h:4202 [inline] _rng_recvmsg crypto/algif_rng.c:101 [inline] rng_recvmsg+0x1af/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f <Zero or more stacks not recorded to save memory> Uninit was stored to memory at: crypto_sha3_finup+0x136/0xe00 crypto/sha3_generic.c:202 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 jent_hash_time+0x247/0x590 crypto/jitterentropy-kcapi.c:138 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: crypto_shash_finup+0xc5a/0xe80 crypto/shash.c:162 crypto_shash_update include/crypto/hash.h:994 [inline] jent_hash_time+0x1de/0x590 crypto/jitterentropy-kcapi.c:136 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: put_unaligned_le64 include/linux/unaligned.h:43 [inline] crypto_sha3_finup+0xc98/0xe00 crypto/sha3_generic.c:213 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 jent_hash_time+0x247/0x590 crypto/jitterentropy-kcapi.c:138 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: keccakf_round crypto/sha3_generic.c:-1 [inline] keccakf+0x1efb/0x2110 crypto/sha3_generic.c:155 crypto_sha3_finup+0x772/0xe00 crypto/sha3_generic.c:210 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 jent_hash_time+0x247/0x590 crypto/jitterentropy-kcapi.c:138 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: crypto_sha3_finup+0x5be/0xe00 crypto/sha3_generic.c:207 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 jent_hash_time+0x247/0x590 crypto/jitterentropy-kcapi.c:138 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: crypto_sha3_finup+0x136/0xe00 crypto/sha3_generic.c:202 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 jent_hash_time+0x247/0x590 crypto/jitterentropy-kcapi.c:138 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: crypto_shash_finup+0xc5a/0xe80 crypto/shash.c:162 crypto_shash_update include/crypto/hash.h:994 [inline] jent_hash_time+0x1de/0x590 crypto/jitterentropy-kcapi.c:136 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 jent_measure_jitter+0x547/0x770 crypto/jitterentropy.c:541 jent_gen_entropy+0x209/0x450 crypto/jitterentropy.c:569 jent_read_entropy+0x353/0xeb0 crypto/jitterentropy.c:615 jent_kcapi_random+0x6c/0x250 crypto/jitterentropy-kcapi.c:284 crypto_rng_generate include/crypto/rng.h:144 [inline] _rng_recvmsg crypto/algif_rng.c:97 [inline] rng_recvmsg+0x149/0x2d0 crypto/algif_rng.c:114 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x2df/0x390 net/socket.c:1087 sock_read_iter+0x2c8/0x360 net/socket.c:1157 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x2f9c/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable intermediary created at: jent_hash_time+0x9b/0x590 crypto/jitterentropy-kcapi.c:110 jent_condition_data+0x4f0/0x510 crypto/jitterentropy.c:438 Bytes 0-23 of 24 are uninitialized Memory access of size 24 starts at ffff88811855fb70 Data copied to user address 00002000000001c0 CPU: 1 UID: 0 PID: 5820 Comm: syz-executor170 Not tainted 6.16.0-syzkaller-11952-g6e64f4580381 #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
