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panic: ASan: Unauthorized Access In ADDR: Addr ADDR [NUM bytes, write, MallocRedZone]

Status: fixed on 2022/08/06 09:42
Reported-by: syzbot+2aae7c4eddc796f917e6@syzkaller.appspotmail.com
Fix commit: bd3b97511997 ptyfs: Don't copy out cookies past end of buffer.
First crash: 842d, last: 842d
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2022/08/05 09:21 21m riastradh@netbsd.org patch https://github.com/NetBSD/src trunk OK log

Sample crash report:
[  48.4397723] panic: ASan: Unauthorized Access In 0xffffffff8187a2f5: Addr 0xffffd70013c21658 [8 bytes, write, MallocRedZone]

[  48.4497715] cpu1: Begin traceback...
[  48.4597654] vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
[  48.4897622] panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1043
[  48.5197655] kasan_report() at netbsd:kasan_report+0x8f kasan_code_name sys/kern/subr_asan.c:168 [inline]
[  48.5197655] kasan_report() at netbsd:kasan_report+0x8f sys/kern/subr_asan.c:200
[  48.5497629] __asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_8byte_isvalid sys/kern/subr_asan.c:370 [inline]
[  48.5497629] __asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_check sys/kern/subr_asan.c:420 [inline]
[  48.5497629] __asan_store8() at netbsd:__asan_store8+0xaf sys/kern/subr_asan.c:1207
[  48.5797671] ptyfs_readdir() at netbsd:ptyfs_readdir+0x29f sys/fs/ptyfs/ptyfs_vnops.c:704
[  48.6097649] VOP_READDIR() at netbsd:VOP_READDIR+0x1d9 sys/kern/vnode_if.c:1470
[  48.6297610] compat_30_sys_getdents() at netbsd:compat_30_sys_getdents+0x389 sys/compat/common/vfs_syscalls_30.c:256
[  48.6597613] sys_syscall() at netbsd:sys_syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
[  48.6597613] sys_syscall() at netbsd:sys_syscall+0x10e sys/kern/sys_syscall.c:90
[  48.6897615] syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
[  48.6897615] syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
[  48.6897615] syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
[  48.6997631] --- syscall (number 272 via SYS_syscall) ---
[  48.7097644] netbsd:syscall+0x25a:
[  48.7197615] cpu1: End traceback...
[  48.7197615] fatal breakpoint trap in supervisor mode
[  48.7197615] trap type 1 code 0 rip 0xffffffff80220a4d cs 0x8 rflags 0x282 cr2 0x7e3f06005000 ilevel 0 rsp 0xffffd7019d927810
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d927330
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d926e50
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d926970
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d926490
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d925fb0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d925ad0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d9255f0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d925110
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d924c30
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d924750
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d924270
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d923d90
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d9238b0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d9233d0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d922ef0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd7019d922a10
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
[  48.7397598] fatal double fault in supervisor mode
[  48.7397598] trap type 13 code 0 rip 0xffffffff81bae76e cs 0x8 rflags 0x10286 cr2 0xffffd7019d921fe8 ilevel 0x8 rsp 0xffffd7019d921ff0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: double fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10083 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184debc40
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184deb760
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184deb280
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184deada0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184dea8c0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184dea3e0
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184de9f00
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184de9a20
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184de9540
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184de9060
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
[  48.7397598] uvm_fault(0xffffd7001347a200, 0xffff900000000000, 1) -> e
[  48.7397598] fatal page fault in supervisor mode
[  48.7397598] trap type 6 code 0 rip 0xffffffff81b8407b cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffd70184de8b80
[  48.7397598] curlwp 0xffffd70013c34a00 pid 1223.1223 lowest kstack 0xffffd7019d9202c0
kernel: page fault trap, code=0
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000200000000 = 8192 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 4c05c429-9a8a-6fd4-5ca1-d65f7eaf5bf3
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2490: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.11 (Thu Jun 11 19:20:47 UTC 2020) (from NetBSD 9.99.65)
>> Memory: 639/3144640 k

     1. Boot normally
     2. Boot single user
     3. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 1 will be chosen in 5 seconds. 4 seconds. 3 seconds. 2 seconds. 1 seconds. 0 seconds. 0 seconds.     
command(s): rndseed /var/db/entropy-file;boot
default boot twice, skipping...
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/-\|/-\|/-\|/-\|/-\|/-\|Loading /var/db/entropy-file  
[   1.0000000] cpu_rng: rdrand/rdseed
[   1.0000000] entropy: ready
[   1.0000000] entropy: entering seed from bootloader with 256 bits of entropy
[   1.0000000] Loaded initial symtab at 0xffffffff83600af8, strtab at 0xffffffff837735e0, # entries 63263

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/02 10:18 netbsd ac44c67317ab fef302b1 .config console log report syz C ci2-netbsd panic: ASan: Unauthorized Access In ADDR: Addr ADDR [NUM bytes, write, MallocRedZone]
* Struck through repros no longer work on HEAD.