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47 lines
1.6 KiB
47 lines
1.6 KiB
From eeb629102da9a9a916d201bbd5f13ee7ad23844d Mon Sep 17 00:00:00 2001 |
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From: Karel Zak <kzak@redhat.com> |
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Date: Tue, 22 Sep 2015 15:27:39 +0200 |
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Subject: [PATCH 110/116] libblkid: (zfs) keep bufferes read-only |
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Upstream: https://github.com/karelzak/util-linux/commit/9325a8be9e55cc01d9f580e14dd2193829245183 |
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1392661 |
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Signed-off-by: Karel Zak <kzak@redhat.com> |
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--- |
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libblkid/src/superblocks/zfs.c | 11 ++++++++--- |
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1 file changed, 8 insertions(+), 3 deletions(-) |
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diff --git a/libblkid/src/superblocks/zfs.c b/libblkid/src/superblocks/zfs.c |
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index 9b5601e..8e88b39 100644 |
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--- a/libblkid/src/superblocks/zfs.c |
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+++ b/libblkid/src/superblocks/zfs.c |
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@@ -70,9 +70,10 @@ struct nvlist { |
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static void zfs_extract_guid_name(blkid_probe pr, loff_t offset) |
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{ |
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+ unsigned char *p, buff[4096]; |
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struct nvlist *nvl; |
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struct nvpair *nvp; |
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- size_t left = 4096; |
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+ size_t left = sizeof(buff); |
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int found = 0; |
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offset = (offset & ~(VDEV_LABEL_SIZE - 1)) + VDEV_LABEL_NVPAIR; |
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@@ -81,10 +82,14 @@ static void zfs_extract_guid_name(blkid_probe pr, loff_t offset) |
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* the first 4k (left) of the nvlist. This is true for all pools |
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* I've seen, and simplifies this code somewhat, because we don't |
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* have to handle an nvpair crossing a buffer boundary. */ |
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- nvl = (struct nvlist *)blkid_probe_get_buffer(pr, offset, left); |
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- if (nvl == NULL) |
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+ p = blkid_probe_get_buffer(pr, offset, left); |
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+ if (!p) |
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return; |
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+ /* libblkid buffers are strictly readonly, but the code below modifies nvpair etc. */ |
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+ memcpy(buff, p, sizeof(buff)); |
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+ nvl = (struct nvlist *) buff; |
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+ |
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nvdebug("zfs_extract: nvlist offset %llu\n", offset); |
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nvp = &nvl->nvl_nvpair; |
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-- |
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2.9.3
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