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xfs: fix log recovery buffer allocation for the legacy h_size fixup

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commit 45cf976008 upstream.

Commit a70f9fe52d ("xfs: detect and handle invalid iclog size set by
mkfs") added a fixup for incorrect h_size values used for the initial
umount record in old xfsprogs versions.  Later commit 0c771b99d6
("xfs: clean up calculation of LR header blocks") cleaned up the log
reover buffer calculation, but stoped using the fixed up h_size value
to size the log recovery buffer, which can lead to an out of bounds
access when the incorrect h_size does not come from the old mkfs
tool, but a fuzzer.

Fix this by open coding xlog_logrec_hblks and taking the fixed h_size
into account for this calculation.

Fixes: 0c771b99d6 ("xfs: clean up calculation of LR header blocks")
Reported-by: Sam Sun <samsun1006219@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Kevin Berry <kpberry@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2024-04-30 06:07:55 +02:00 committed by Greg Kroah-Hartman
parent d55450b96f
commit 57835c0e71
1 changed files with 14 additions and 6 deletions
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20
fs/xfs/xfs_log_recover.c
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@ -2960,7 +2960,7 @@ xlog_do_recovery_pass(
int error = 0, h_size, h_len;
int error2 = 0;
int bblks, split_bblks;
int hblks, split_hblks, wrapped_hblks;
int hblks = 1, split_hblks, wrapped_hblks;
int i;
struct hlist_head rhash[XLOG_RHASH_SIZE];
LIST_HEAD (buffer_list);
@ -3016,14 +3016,22 @@ xlog_do_recovery_pass(
if (error)
goto bread_err1;
hblks = xlog_logrec_hblks(log, rhead);
if (hblks != 1) {
kmem_free(hbp);
hbp = xlog_alloc_buffer(log, hblks);
/*
* This open codes xlog_logrec_hblks so that we can reuse the
* fixed up h_size value calculated above. Without that we'd
* still allocate the buffer based on the incorrect on-disk
* size.
*/
if (h_size > XLOG_HEADER_CYCLE_SIZE &&
(rhead->h_version & cpu_to_be32(XLOG_VERSION_2))) {
hblks = DIV_ROUND_UP(h_size, XLOG_HEADER_CYCLE_SIZE);
if (hblks > 1) {
kmem_free(hbp);
hbp = xlog_alloc_buffer(log, hblks);
}
}
} else {
ASSERT(log->l_sectBBsize == 1);
hblks = 1;
hbp = xlog_alloc_buffer(log, 1);
h_size = XLOG_BIG_RECORD_BSIZE;
}