syzbot


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

Status: auto-obsoleted due to no activity on 2023/11/08 10:43
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+cb9a66e7d40d1bd13b25@syzkaller.appspotmail.com
First crash: 371d, last: 327d
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2023/06/17 upstream (ToT) 1639fae5132b C [report] KASAN: slab-out-of-bounds Read in read_descriptors
2023/09/16 upstream (ToT) d8d7cd656361 C Didn't crash
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 read_descriptors origin:upstream missing-backport C error 2 281d 371d 0/3 upstream: reported C repro on 2023/06/17 08:07
upstream KASAN: slab-out-of-bounds Read in read_descriptors (2) usb 1 1401d 1397d 15/27 fixed on 2020/10/10 01:52
upstream KASAN: slab-out-of-bounds Read in read_descriptors usb 1 1706d 1705d 0/27 auto-closed as invalid on 2020/02/18 03:02
upstream KASAN: slab-out-of-bounds Read in read_descriptors (3) usb C error 7 341d 368d 23/27 fixed on 2023/10/12 12:48
upstream KMSAN: uninit-value in read_descriptors (2) usb 1 468d 468d 0/27 auto-obsoleted due to no activity on 2023/06/10 07:49
upstream KMSAN: uninit-value in read_descriptors usb 1 837d 837d 0/27 auto-closed as invalid on 2022/06/06 09:45
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/10/01 03:13 10m bisect fix linux-6.1.y error job log (0)
2023/07/31 08:04 2h38m bisect fix linux-6.1.y job log (0) log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in read_descriptors+0x23c/0x290 drivers/usb/core/sysfs.c:883
Read of size 2 at addr ffff0000d8e96aaa by task udevd/4228

CPU: 1 PID: 4228 Comm: udevd Not tainted 6.1.34-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 read_descriptors+0x23c/0x290 drivers/usb/core/sysfs.c:883
 sysfs_kf_bin_read+0x19c/0x1d4 fs/sysfs/file.c:97
 kernfs_file_read_iter fs/kernfs/file.c:247 [inline]
 kernfs_fop_read_iter+0x3ac/0x5c8 fs/kernfs/file.c:276
 call_read_iter include/linux/fs.h:2199 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x5bc/0x8ac fs/read_write.c:470
 ksys_read+0x15c/0x26c fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __arm64_sys_read+0x7c/0x90 fs/read_write.c:621
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

Allocated by task 4226:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0xd8/0x1c4 mm/slab_common.c:968
 kmalloc include/linux/slab.h:558 [inline]
 kzalloc include/linux/slab.h:689 [inline]
 usb_get_configuration+0xd8/0x4048 drivers/usb/core/config.c:882
 usb_enumerate_device drivers/usb/core/hub.c:2407 [inline]
 usb_new_device+0x134/0x142c drivers/usb/core/hub.c:2545
 hub_port_connect drivers/usb/core/hub.c:5355 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5499 [inline]
 port_event drivers/usb/core/hub.c:5655 [inline]
 hub_event+0x23dc/0x44a0 drivers/usb/core/hub.c:5737
 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289
 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

The buggy address belongs to the object at ffff0000d8e96800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 682 bytes inside of
 1024-byte region [ffff0000d8e96800, ffff0000d8e96c00)

The buggy address belongs to the physical page:
page:000000003eb4bdce refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118e90
head:000000003eb4bdce order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d8e96980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d8e96a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d8e96a80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff0000d8e96b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d8e96b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/17 07:47 linux-6.1.y ca87e77a2ef8 f3921d4d .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in read_descriptors
* Struck through repros no longer work on HEAD.