| Summary: |
geom(4): Garbage on disk (or USB memory stick) can cause GEOM taste ffs_sbget() to crash via g_label_ufs_taste_common: panic: vm_fault_lookup: fault on nofault entry, addr: 0xfffffe0009409000 |
| Product: |
Base System
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Reporter: |
Robert Morris <rtm> |
| Component: |
kern | Assignee: |
freebsd-geom (Nobody) <geom> |
| Status: |
Closed
FIXED
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| Severity: |
Affects Some People
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CC: |
emaste, fs, geom, grahamperrin, mckusick, pho, pi
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| Priority: |
---
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Keywords: |
crash, needs-qa |
| Version: |
13.0-RELEASE | Flags: |
koobs:
mfc-stable13?
koobs:
mfc-stable12?
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| Hardware: |
Any | |
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| OS: |
Any | |
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| See Also: |
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263822
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| Bug Depends on: |
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| Bug Blocks: |
263979
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| Attachments: |
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Created attachment 226873 [details] A usb key image that causes a kernel page fault. A USB memory stick with the attached content, if inserted in my 13.0-RELEASE-p3 amd64 machine, causes a crash. Here's a kernel backtrace: panic: vm_fault_lookup: fault on nofault entry, addr: 0xfffffe0009409000 cpuid = 0 time = 1627895621 KDB: stack backtrace: #0 0xffffffff80c57515 at kdb_backtrace+0x65 #1 0xffffffff80c09ef1 at vpanic+0x181 #2 0xffffffff80c09d63 at panic+0x43 #3 0xffffffff80f289ab at vm_fault+0x144b #4 0xffffffff80f27481 at vm_fault_trap+0xb1 #5 0xffffffff8108b3b8 at trap_pfault+0x1f8 #6 0xffffffff8108a86d at trap+0x27d #7 0xffffffff81061978 at calltrap+0x8 #8 0xffffffff80efc974 at ffs_sbget+0x3c4 #9 0xffffffff80b54a77 at g_label_ufs_taste_common+0x57 #10 0xffffffff80b533af at g_label_taste+0x1df #11 0xffffffff80b51aba at g_new_provider_event+0x7a #12 0xffffffff80b4cc3e at g_run_events+0x12e #13 0xffffffff80bc7e2e at fork_exit+0x7e #14 0xffffffff810629fe at fork_trampoline+0xe You can also get the crash with % sudo mdconfig -f fat12.img fat12.img contains garbage that apparently looks enough like an FFS file system that GEOM taste's call to ffs_sbget() proceeds, but then crashes near the end.