Date: Wed, 11 Aug 2021 13:19:25 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 257768] Corrupt UDF disk image can cause crash when mounted. Message-ID: <bug-257768-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D257768 Bug ID: 257768 Summary: Corrupt UDF disk image can cause crash when mounted. Product: Base System Version: 13.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: rtm@lcs.mit.edu If a corrupt (or malicious) UDF disk contains root_icb.len -2032, udf_mountfs() ends up passing a size of zero to breadn_flags(), which causes it to return a bp with an unmapped b_data, which causes udf_mountfs()/udf_checktag() to pagefault. You can see this with the attached UDF image, using mdconfig -f bad-udf.iso mount_udf /dev/md0 /mnt which yields (on my amd64 13.0-RELEASE-p3 machine): panic: vm_fault_lookup: fault on nofault entry, addr: 0xfffffe0009cd8000 cpuid =3D 0 time =3D 1628673343 KDB: stack backtrace: #0 0xffffffff80c57515 at kdb_backtrace+0x65 #1 0xffffffff80c09ef1 at vpanic+0x181 #2 0xffffffff80c09d63 at panic+0x43 #3 0xffffffff80f289db at vm_fault+0x144b #4 0xffffffff80f274b1 at vm_fault_trap+0xb1 #5 0xffffffff8108b3b8 at trap_pfault+0x1f8 #6 0xffffffff8108a86d at trap+0x27d #7 0xffffffff810619a8 at calltrap+0x8 #8 0xffffffff80cdaa09 at vfs_domount+0x5e9 #9 0xffffffff80cd9c27 at vfs_donmount+0x8e7 #10 0xffffffff80cd9309 at sys_nmount+0x69 #11 0xffffffff8108babc at amd64_syscall+0x10c #12 0xffffffff810622ce at fast_syscall_common+0xf8 --=20 You are receiving this mail because: You are the assignee for the bug.=
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