On 10/26/21 9:39 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 9ae1fbdeabd3 Add linux-next specific files for 20211025 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1331363cb00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=aeb17e42bc109064 > dashboard link: https://syzkaller.appspot.com/bug?extid=b86736b5935e0d25b446 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116ce954b00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132fcf62b00000 > > The issue was bisected to: > > commit 22849b5ea5952d853547cc5e0651f34a246b2a4f > Author: Leon Romanovsky <leonro@xxxxxxxxxx> > Date: Thu Oct 21 14:16:14 2021 +0000 > > devlink: Remove not-executed trap policer notifications More likely this came with caaf2874ba27b92bca6f0298bf88bad94067ec37 hwrng: virtio - don't waste entropy > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137d8bfcb00000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=10fd8bfcb00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=177d8bfcb00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+b86736b5935e0d25b446@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 22849b5ea595 ("devlink: Remove not-executed trap policer notifications") > > ================================================================== > BUG: KASAN: slab-out-of-bounds in memcpy include/linux/fortify-string.h:225 [inline] > BUG: KASAN: slab-out-of-bounds in copy_data+0xf3/0x2e0 drivers/char/hw_random/virtio-rng.c:68 > Read of size 64 at addr ffff88801a7a1580 by task syz-executor989/6542 > > CPU: 1 PID: 6542 Comm: syz-executor989 Not tainted 5.15.0-rc6-next-20211025-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 > print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 > __kasan_report mm/kasan/report.c:433 [inline] > kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 > check_region_inline mm/kasan/generic.c:183 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 > memcpy+0x20/0x60 mm/kasan/shadow.c:65 > memcpy include/linux/fortify-string.h:225 [inline] > copy_data+0xf3/0x2e0 drivers/char/hw_random/virtio-rng.c:68 > virtio_read+0x1e0/0x230 drivers/char/hw_random/virtio-rng.c:90 > rng_get_data drivers/char/hw_random/core.c:192 [inline] > rng_dev_read+0x400/0x660 drivers/char/hw_random/core.c:229 > vfs_read+0x1b5/0x600 fs/read_write.c:483 > ksys_read+0x12d/0x250 fs/read_write.c:623 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f05696617e9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffd06461948 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > RAX: ffffffffffffffda RBX: 000000000001294d RCX: 00007f05696617e9 > RDX: 00000000fffffff1 RSI: 0000000020000180 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 00007ffd064619b0 R09: 00007ffd064619b0 > R10: 00007ffd064613d0 R11: 0000000000000246 R12: 00007ffd0646197c > R13: 00007ffd064619b0 R14: 00007ffd06461990 R15: 0000000000000002 > </TASK> > > Allocated by task 1: > kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 > kasan_set_track mm/kasan/common.c:46 [inline] > set_alloc_info mm/kasan/common.c:434 [inline] > ____kasan_kmalloc mm/kasan/common.c:513 [inline] > ____kasan_kmalloc mm/kasan/common.c:472 [inline] > __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 > kmalloc include/linux/slab.h:590 [inline] > kzalloc include/linux/slab.h:724 [inline] > probe_common+0xaa/0x5b0 drivers/char/hw_random/virtio-rng.c:132 > virtio_dev_probe+0x44e/0x760 drivers/virtio/virtio.c:273 > call_driver_probe drivers/base/dd.c:517 [inline] > really_probe+0x245/0xcc0 drivers/base/dd.c:596 > __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751 > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781 > __driver_attach+0x22d/0x4e0 drivers/base/dd.c:1140 > bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:301 > bus_add_driver+0x41d/0x630 drivers/base/bus.c:618 > driver_register+0x220/0x3a0 drivers/base/driver.c:171 > do_one_initcall+0x103/0x650 init/main.c:1303 > do_initcall_level init/main.c:1378 [inline] > do_initcalls init/main.c:1394 [inline] > do_basic_setup init/main.c:1413 [inline] > kernel_init_freeable+0x6b1/0x73a init/main.c:1618 > kernel_init+0x1a/0x1d0 init/main.c:1507 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > > The buggy address belongs to the object at ffff88801a7a1400 > which belongs to the cache kmalloc-512 of size 512 > The buggy address is located 384 bytes inside of > 512-byte region [ffff88801a7a1400, ffff88801a7a1600) > The buggy address belongs to the page: > page:ffffea000069e800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a7a0 > head:ffffea000069e800 order:2 compound_mapcount:0 compound_pincount:0 > flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) > raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c41c80 > raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 7709676886, free_ts 0 > prep_new_page mm/page_alloc.c:2418 [inline] > get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 > __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 > alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2036 > alloc_pages+0x29f/0x300 mm/mempolicy.c:2186 > alloc_slab_page mm/slub.c:1793 [inline] > allocate_slab mm/slub.c:1930 [inline] > new_slab+0x32d/0x4a0 mm/slub.c:1993 > ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 > __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 > slab_alloc_node mm/slub.c:3200 [inline] > slab_alloc mm/slub.c:3242 [inline] > kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259 > kmalloc include/linux/slab.h:590 [inline] > kzalloc include/linux/slab.h:724 [inline] > device_private_init drivers/base/core.c:3238 [inline] > device_add+0x11a7/0x1ee0 drivers/base/core.c:3288 > device_create_groups_vargs+0x203/0x280 drivers/base/core.c:4052 > device_create_with_groups+0xe3/0x120 drivers/base/core.c:4138 > misc_register+0x20a/0x690 drivers/char/misc.c:206 > register_miscdev drivers/char/hw_random/core.c:422 [inline] > hwrng_modinit+0xd0/0x109 drivers/char/hw_random/core.c:621 > do_one_initcall+0x103/0x650 init/main.c:1303 > do_initcall_level init/main.c:1378 [inline] > do_initcalls init/main.c:1394 [inline] > do_basic_setup init/main.c:1413 [inline] > kernel_init_freeable+0x6b1/0x73a init/main.c:1618 > kernel_init+0x1a/0x1d0 init/main.c:1507 > page_owner free stack trace missing > > Memory state around the buggy address: > ffff88801a7a1480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88801a7a1500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff88801a7a1580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff88801a7a1600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff88801a7a1680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > 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. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches >
