syzbot


KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer

Status: auto-obsoleted due to no activity on 2023/08/17 04:37
Reported-by: syzbot+2aadf39f3eb5456a49fe@syzkaller.appspotmail.com
First crash: 362d, last: 362d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer media 1 1548d 1548d 0/26 auto-closed as invalid on 2020/05/17 19:44
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (2) media C inconclusive done 14 440d 952d 22/26 fixed on 2023/02/24 13:51
linux-4.19 BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) syz error 8 486d 987d 0/1 upstream: reported syz repro on 2021/08/02 00:51
linux-4.14 BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) 1 820d 820d 0/1 auto-closed as invalid on 2022/05/15 07:48
upstream BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) media 1 370d 366d 0/26 auto-obsoleted due to no activity on 2023/07/09 12:46

Sample crash report:
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x145c/0x482c drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2626
Write of size 128 at addr ffff800024cadfa0 by task vivid-000-vid-c/27513

CPU: 0 PID: 27513 Comm: vivid-000-vid-c Not tainted 5.15.107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memcpy+0xb4/0xe8 mm/kasan/shadow.c:66
 tpg_fill_plane_buffer+0x145c/0x482c drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2626
 vivid_fillbuff drivers/media/test-drivers/vivid/vivid-kthread-cap.c:469 [inline]
 vivid_thread_vid_cap_tick+0x17b0/0x5698 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:729
 vivid_thread_vid_cap+0x6ac/0xc94 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:868
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870


Memory state around the buggy address:
 ffff800024cadf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff800024cadf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff800024cae000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffff800024cae080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffff800024cae100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================
Unable to handle kernel paging request at virtual address ffff800024cae000
Mem abort info:
  ESR = 0x0000000096000047
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x07: level 3 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000047
  CM = 0, WnR = 1
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001b4b0d000
[ffff800024cae000] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=1000000107dd9003, pte=0000000000000000
Internal error: Oops: 96000047 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 27513 Comm: vivid-000-vid-c Tainted: G    B             5.15.107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __memcpy+0xd8/0x260 arch/arm64/lib/memcpy.S:136
lr : memcpy+0xc8/0xe8 mm/kasan/shadow.c:69
sp : ffff800024c875e0
x29: ffff800024c875e0 x28: ffff800024cadfc0 x27: ffff80001a199000
x26: 0000000000000000 x25: 000000000000007e x24: ffff80001a199000
x23: ffff800016ebf000 x22: ffff80000e22702c x21: ffff800024cadfc0
x20: ffff80001a199000 x19: 0000000000000080 x18: 0000000000000000
x17: 80b380b380b380b3 x16: 80b380b380b380b3 x15: 80b380b380b380b3
x14: 80b380b380b380b3 x13: 8da02ca08da02ca0 x12: 8da02ca08da02ca0
x11: 8da02ca08da02ca0 x10: 8da02ca08da02ca0 x9 : 80b380b380b380b3
x8 : 80b380b380b380b3 x7 : 80b380b380b380b3 x6 : 80b380b380b380b3
x5 : ffff800024cae040 x4 : 8da02ca086a056b3 x3 : 80b380b380b380b3
x2 : 80b380b380b380b3 x1 : 80b380b380b380b3 x0 : ffff800024cadfc0
Call trace:
 __memcpy+0xd8/0x260 arch/arm64/lib/memcpy.S:135
 tpg_fill_plane_buffer+0x145c/0x482c drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2626
 vivid_fillbuff drivers/media/test-drivers/vivid/vivid-kthread-cap.c:469 [inline]
 vivid_thread_vid_cap_tick+0x17b0/0x5698 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:729
 vivid_thread_vid_cap+0x6ac/0xc94 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:868
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Code: f101805f 540000a9 a97c0c82 a97d1081 (a93c0ca2) 
---[ end trace a55d489da394871a ]---
----------------
Code disassembly (best guess):
   0:	f101805f 	cmp	x2, #0x60
   4:	540000a9 	b.ls	0x18  // b.plast
   8:	a97c0c82 	ldp	x2, x3, [x4, #-64]
   c:	a97d1081 	ldp	x1, x4, [x4, #-48]
* 10:	a93c0ca2 	stp	x2, x3, [x5, #-64] <-- trapping instruction

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/19 04:37 linux-5.15.y 4fdad925aa1a d931e9f0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
* Struck through repros no longer work on HEAD.