syzbot


KASAN: slab-out-of-bounds Read in generic_perform_write

Status: upstream: reported C repro on 2023/09/24 07:49
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+4a2376bc62e59406c414@syzkaller.appspotmail.com
First crash: 70d, last: 3d17h
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: slab-out-of-bounds Read in generic_perform_write (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] [mm?] [hfs?] KASAN: slab-out-of-bounds Read in generic_perform_write 0 (2) 2023/11/17 14:24
[syzbot] Monthly ext4 report (Nov 2023) 0 (1) 2023/11/08 23:44
[PATCH] fs/hfsplus: expand s_vhdr_buf size to avoid slab oob 1 (1) 2023/09/26 10:24
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: slab-out-of-bounds Read in generic_perform_write 2 51d 73d 0/3 upstream: reported on 2023/09/17 14:11
linux-4.14 KASAN: use-after-free Read in generic_perform_write (2) hfsplus jfs C error 20 307d 725d 0/1 upstream: reported C repro on 2021/12/05 01:05
linux-4.19 KASAN: use-after-free Read in generic_perform_write hfsplus jfs C error 68 270d 1161d 0/1 upstream: reported C repro on 2020/09/24 08:55
linux-6.1 KASAN: use-after-free Read in generic_perform_write origin:lts-only syz unreliable 3 24d 79d 0/3 upstream: reported syz repro on 2023/09/12 02:51
linux-4.14 KASAN: use-after-free Read in generic_perform_write 11 930d 1159d 0/1 auto-closed as invalid on 2021/09/11 00:48
upstream KASAN: use-after-free Read in generic_perform_write fs mm C error 73 897d 1959d 0/25 auto-obsoleted due to no activity on 2023/04/14 08:17
Last patch testing requests (6)
Created Duration User Patch Repo Result
2023/11/17 14:24 2h38m tintinm2017@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2023/11/11 11:54 15m retest repro upstream report log
2023/10/28 09:47 18m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2023/09/26 08:01 23m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2cf0f7156238 OK log
2023/09/26 07:10 23m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2cf0f7156238 OK log
2023/09/26 06:18 15m eadavis@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2cf0f7156238 report log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy_from_iter lib/iov_iter.c:380 [inline]
BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x908/0x12f0 lib/iov_iter.c:590
Read of size 1024 at addr ffff888020b4ec00 by task kworker/u4:7/1273

CPU: 0 PID: 1273 Comm: kworker/u4:7 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: loop0 loop_rootcg_workfn
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x175/0x1b0 mm/kasan/report.c:588
 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 memcpy_from_iter lib/iov_iter.c:380 [inline]
 copy_page_from_iter_atomic+0x908/0x12f0 lib/iov_iter.c:590
 generic_perform_write+0x392/0x630 mm/filemap.c:3950
 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2865
 do_iter_write+0x84f/0xde0 fs/read_write.c:860
 lo_write_bvec drivers/block/loop.c:249 [inline]
 lo_write_simple drivers/block/loop.c:271 [inline]
 do_req_filebacked drivers/block/loop.c:495 [inline]
 loop_handle_cmd drivers/block/loop.c:1915 [inline]
 loop_process_work+0x14c3/0x22a0 drivers/block/loop.c:1950
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>

Allocated by task 5038:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1023 [inline]
 __kmalloc+0xb9/0x230 mm/slab_common.c:1036
 kmalloc include/linux/slab.h:603 [inline]
 hfsplus_read_wrapper+0x545/0x1330 fs/hfsplus/wrapper.c:178
 hfsplus_fill_super+0x38e/0x1c90 fs/hfsplus/super.c:413
 mount_bdev+0x237/0x300 fs/super.c:1629
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1750
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888020b4ec00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 allocated 512-byte region [ffff888020b4ec00, ffff888020b4ee00)

The buggy address belongs to the physical page:
page:ffffea000082d300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20b4c
head:ffffea000082d300 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888012841c80 ffffea000085e900 dead000000000002
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, tgid 1 (swapper/0), ts 12443144717, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 alloc_page_interleave+0x22/0x1d0 mm/mempolicy.c:2131
 alloc_slab_page+0x6a/0x160 mm/slub.c:1870
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2070
 ___slab_alloc+0xc85/0x1310 mm/slub.c:3223
 __slab_alloc mm/slub.c:3322 [inline]
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 __kmem_cache_alloc_node+0x1af/0x270 mm/slub.c:3517
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1114
 kmalloc include/linux/slab.h:599 [inline]
 kzalloc include/linux/slab.h:720 [inline]
 dev_pm_qos_constraints_allocate+0x8f/0x400 drivers/base/power/qos.c:204
 __dev_pm_qos_add_request+0x121/0x4a0 drivers/base/power/qos.c:344
 dev_pm_qos_add_request+0x3a/0x60 drivers/base/power/qos.c:394
 usb_hub_create_port_device+0x4c6/0xc40 drivers/usb/core/port.c:727
 hub_configure drivers/usb/core/hub.c:1685 [inline]
 hub_probe+0x2469/0x3570 drivers/usb/core/hub.c:1922
 usb_probe_interface+0x5c4/0xb00 drivers/usb/core/driver.c:396
 really_probe+0x294/0xc30 drivers/base/dd.c:658
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888020b4ed00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888020b4ed80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888020b4ee00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888020b4ee80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888020b4ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (10184):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/20 07:37 upstream 2cf0f7156238 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in generic_perform_write
2023/10/14 04:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 249eb8f39efb 6388bc36 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in generic_perform_write
2023/11/16 00:53 upstream c42d9eeef8e5 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in generic_perform_write
2023/09/23 06:35 upstream 8018e02a8703 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in generic_perform_write
2023/11/26 11:11 upstream 090472ed9c92 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in generic_perform_write
2023/10/13 09:31 upstream e8c127b05766 6388bc36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in generic_perform_write
2023/10/03 03:50 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 03:38 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 03:24 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 03:08 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 02:52 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 02:39 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 02:25 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 02:10 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 01:57 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 01:41 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 01:28 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 01:15 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 01:00 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 00:43 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 00:28 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/03 00:10 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 23:58 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 23:41 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 23:23 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 23:09 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 22:56 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 22:42 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 22:26 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 22:13 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 22:00 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 21:44 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 21:32 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 21:20 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 21:07 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 20:49 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 20:34 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 20:17 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 20:05 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 19:53 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 18:47 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 17:50 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 16:43 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 15:40 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 14:20 linux-next df964ce9ef9f 50b20e75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 13:04 linux-next df964ce9ef9f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 12:52 linux-next df964ce9ef9f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
2023/10/02 12:39 linux-next df964ce9ef9f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in generic_perform_write
* Struck through repros no longer work on HEAD.