Date: Mon, 04 Oct 2021 17:10:24 +0000 From: bugzilla-noreply@freebsd.org To: ports-bugs@FreeBSD.org Subject: [Bug 258930] sysutils/fusefs-ntfs: corrupt file system can cause seg fault in ntfs_attr_record_resize() Message-ID: <bug-258930-7788@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D258930 Bug ID: 258930 Summary: sysutils/fusefs-ntfs: corrupt file system can cause seg fault in ntfs_attr_record_resize() Product: Ports & Packages Version: Latest Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: Individual Port(s) Assignee: ports-bugs@FreeBSD.org Reporter: rtm@lcs.mit.edu CC: freebsd@dussan.org Flags: maintainer-feedback?(freebsd@dussan.org) CC: freebsd@dussan.org Created attachment 228440 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D228440&action= =3Dedit sysutils/fusefs-ntfs: this disk image causes a seg fault in ntfs_attr_record_resize() The attached corrupt NTFS disk image causes this call to memmove() in ntfs_attr_record_resize() to crash: memmove((u8 *)a + new_size, (u8 *)a + attr_size, old_size - ((u8 *)a - (u8 *)m) - attr_size); I believe problem is that the third argument is negative -- or actually huge, since size_t is unsigned. % gunzip ntx7.img.gz=20 % sudo mdconfig -f ntx7.img=20 md0 % sudo ntfs-3g /dev/md0p1 /mnt Did not find any restart pages in $LogFile and it was not empty. The file system wasn't safely closed on Windows. Fixing. ntfs_attr_find: Corrupt inode (2): Input/output error Non-positive free clusters (0)! Non-positive free clusters (0)! Segmentation fault % ntfs-3g --version ntfs-3g 2017.3.23 external FUSE 29 % uname -a FreeBSD xxx 13.0-RELEASE-p4 FreeBSD 13.0-RELEASE-p4 #0: Tue Aug 24 07:33:27= UTC 2021=20=20=20=20 root@amd64-builder.daemonology.net:/usr/obj/usr/src/amd64.amd64/sys/GENERIC= =20 amd64 The backtrace: #0 0x00000000402a725a in memmove () from /lib/libc.so.7 #1 0x00000000400b0d56 in ntfs_attr_record_resize (m=3D0x409d6400, a=3D0x40= 9d6508,=20 new_size=3D80) at attrib.c:4536 #2 0x00000000400b31f8 in ntfs_attr_update_mapping_pairs_i (na=3D0x40810500= ,=20 from_vcn=3D0, holes=3D<optimized out>) at attrib.c:5795 #3 0x00000000400af714 in ntfs_attr_update_mapping_pairs (na=3D0x409d6558,= =20 from_vcn=3D1107296256) at attrib.c:6003 #4 0x00000000400aed3a in ntfs_attr_pwrite_i (na=3D0x40810500, pos=3D0, cou= nt=3D0,=20 b=3D<optimized out>) at attrib.c:2249 #5 0x00000000400ae360 in ntfs_attr_pwrite (na=3D0x40810500, pos=3D0, count= =3D8192,=20 b=3D0x3fffffc758) at attrib.c:2351 #6 0x00000000400c68a8 in ntfs_empty_logfile (na=3D0x40810500) at logfile.c= :731 #7 0x00000000400d60e2 in ntfs_logfile_reset (vol=3D<optimized out>) at volume.c:1673 #8 0x00000000400d5ed6 in ntfs_device_mount (dev=3D<optimized out>,=20 flags=3D<optimized out>) at volume.c:1268 #9 0x00000000400d6478 in ntfs_mount (name=3D<optimized out>, flags=3D43620= 7616) at volume.c:1386 --=20 You are receiving this mail because: You are the assignee for the bug.=
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