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xfs: clean up memory management in xattr scrub [v24.5]

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Currently, the extended attribute scrubber uses a single VLA to store
 all the context information needed in various parts of the scrubber
 code.  This includes xattr leaf block space usage bitmaps, and the value
 buffer used to check the correctness of remote xattr value block
 headers.  We try to minimize the insanity through the use of helper
 functions, but this is a memory management nightmare.  Clean this up by
 making the bitmap and value pointers explicit members of struct
 xchk_xattr_buf.
 
 Second, strengthen the xattr checking by teaching it to look for overlapping
 data structures in the shortform attr data.
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'scrub-fix-xattr-memory-mgmt-6.4_2023-04-11' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into guilt/xfs-for-next

xfs: clean up memory management in xattr scrub [v24.5]

Currently, the extended attribute scrubber uses a single VLA to store
all the context information needed in various parts of the scrubber
code.  This includes xattr leaf block space usage bitmaps, and the value
buffer used to check the correctness of remote xattr value block
headers.  We try to minimize the insanity through the use of helper
functions, but this is a memory management nightmare.  Clean this up by
making the bitmap and value pointers explicit members of struct
xchk_xattr_buf.

Second, strengthen the xattr checking by teaching it to look for overlapping
data structures in the shortform attr data.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2023-04-14 07:11:10 +10:00 • committed by Dave Chinner
commit bb09d76599
4 changed files with 239 additions and 140 deletions
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