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From e75abae126f9fcaf1e8478f0780ecae736f7d3e1 Mon Sep 17 00:00:00 2001
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Message-Id: <e75abae126f9fcaf1e8478f0780ecae736f7d3e1@dist-git>
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From: "Allen, John" <John.Allen@amd.com>
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Date: Tue, 2 Jul 2019 17:05:34 +0200
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Subject: [PATCH] Handle copying bitmaps to larger data buffers
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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If a bitmap of a shorter length than the data buffer is passed to
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virBitmapToDataBuf, it will read off the end of the bitmap and copy junk
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into the returned buffer. Add a check to only copy the length of the
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bitmap to the buffer.
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The problem can be observed after setting a vcpu affinity using the vcpupin
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command on a system with a large number of cores:
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# virsh vcpupin example_domain 0 0
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# virsh vcpupin example_domain 0
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VCPU CPU Affinity
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---------------------------
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0 0,192,197-198,202
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Signed-off-by: John Allen <john.allen@amd.com>
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(cherry picked from commit 51f9f80d350e633adf479c6a9b3c55f82ca9cbd4)
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https: //bugzilla.redhat.com/show_bug.cgi?id=1703160
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Signed-off-by: Erik Skultety <eskultet@redhat.com>
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Message-Id: <1a487c4f1ba9725eb7325debeeff2861d7047890.1562079635.git.eskultet@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/util/virbitmap.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/src/util/virbitmap.c b/src/util/virbitmap.c
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index 49e542a4e6..7df0a2d4f3 100644
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--- a/src/util/virbitmap.c
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+++ b/src/util/virbitmap.c
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@@ -831,11 +831,15 @@ virBitmapToDataBuf(virBitmapPtr bitmap,
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unsigned char *bytes,
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size_t len)
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{
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+ size_t nbytes = bitmap->map_len * (VIR_BITMAP_BITS_PER_UNIT / CHAR_BIT);
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unsigned long *l;
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size_t i, j;
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memset(bytes, 0, len);
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+ /* If bitmap and buffer differ in size, only fill to the smaller length */
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+ len = MIN(len, nbytes);
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+
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/* htole64 is not provided by gnulib, so we do the conversion by hand */
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l = bitmap->map;
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for (i = j = 0; i < len; i++, j++) {
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--
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2.22.0
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