Hawkins Jiawei b63ddb3ba6 ntfs: check overflow when iterating ATTR_RECORDs ... commit 63095f4f3a upstream. Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). Because the ATTR_RECORDs are next to each other, kernel can get the next ATTR_RECORD from end address of current ATTR_RECORD, through current ATTR_RECORD length field. The problem is that during iteration, when kernel calculates the end address of current ATTR_RECORD, kernel may trigger an integer overflow bug in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`. This may wrap, leading to a forever iteration on 32bit systems. This patch solves it by adding some checks on calculating end address of current ATTR_RECORD during iteration. Link: https://lkml.kernel.org/r/20220831160935.3409-4-yin31149@gmail.com Link: https://lore.kernel.org/all/20220827105842.GM2030@kadam/ Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Anton Altaparmakov <anton@tuxera.com> Cc: chenxiaosong (A) <chenxiaosong2@huawei.com> Cc: syzkaller-bugs <syzkaller-bugs@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-11-26 09:24:52 +01:00
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Kconfig	…
Makefile	…
aops.c	…
aops.h	…
attrib.c	ntfs: check overflow when iterating ATTR_RECORDs	2022-11-26 09:24:52 +01:00
attrib.h	…
bitmap.c	…
bitmap.h	…
collate.c	…
collate.h	…
compress.c	…
debug.c	…
debug.h	…
dir.c	…
dir.h	…
endian.h	…
file.c	…
index.c	…
index.h	…
inode.c	ntfs: fix use-after-free in ntfs_attr_find()	2022-11-26 09:24:51 +01:00
inode.h	…
layout.h	…
lcnalloc.c	…
lcnalloc.h	…
logfile.c	…
logfile.h	…
malloc.h	…
mft.c	…
mft.h	…
mst.c	…
namei.c	…
ntfs.h	…
quota.c	…
quota.h	…
runlist.c	…
runlist.h	…
super.c	…
sysctl.c	…
sysctl.h	…
time.h	…
types.h	…
unistr.c	…
upcase.c	…
usnjrnl.c	…
usnjrnl.h	…
volume.h	…