e1926bddf9
- Update ext2fs_swap_inode_full() fix to match upstream - Check more of swapv1 header in blkid detection (#442937)
43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
[PATCH] blkid: more sanity checks for swap v1
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mkswap followed by pvcreate on a block device
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will still turn up as "swap" in blkid, because
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pvcreate isn't particularly careful about zeroing
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old signatures. (neither is mkswap, for that matter).
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Testing for appropriate version and page counts
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gives us a bit more confidence that we have a
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real swap (v1) partition.
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Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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---
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lib/blkid/probe.c | 7 ++++++-
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1 files changed, 6 insertions(+), 1 deletions(-)
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diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
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index 45885c3..a070201 100644
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--- a/lib/blkid/probe.c
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+++ b/lib/blkid/probe.c
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@@ -827,7 +827,7 @@ static int probe_swap0(struct blkid_probe *probe,
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}
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static int probe_swap1(struct blkid_probe *probe,
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- struct blkid_magic *id __BLKID_ATTR((unused)),
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+ struct blkid_magic *id,
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unsigned char *buf __BLKID_ATTR((unused)))
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{
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struct swap_id_block *sws;
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@@ -843,6 +843,11 @@ static int probe_swap1(struct blkid_probe *probe,
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if (!sws)
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return 1;
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+ /* check for wrong version or zeroed pagecount, for sanity */
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+ if (!memcmp(id->bim_magic, "SWAPSPACE2", id->bim_len) &&
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+ (sws->sws_version != 1 || sws->sws_lastpage == 0))
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+ return 1;
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+
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/* arbitrary sanity check.. is there any garbage down there? */
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if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
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if (sws->sws_volume[0])
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-- 1.5.4.1
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