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From b29b4b4ec846861c975bfa580386d25d48eaa087 Mon Sep 17 00:00:00 2001
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From: Ravishankar N <ravishankar@redhat.com>
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Date: Mon, 8 Oct 2018 11:04:14 +0530
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Subject: [PATCH 397/399] features/locks: add buffer overflow checks in
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pl_getxattr
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Problem:
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A compromised client can send a variable length buffer value for the
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GF_XATTR_CLRLK_CMD virtual xattr. If the length is greater than the
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size of the "key" used to send the response back, locks xlator can
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segfault when it tries to do a dict_set because of the buffer overflow
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in strncpy of pl_getxattr().
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Fix:
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Perform size checks while forming the 'key'.
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Note:
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This fix is already there in the master branch upstream.
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Also, it looks like the size PATH_MAX used for 'key' array is not really
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needed since the maximum length seems to be
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"strlen(glusterfs.clrlk.tentry.kblocked) + NAME_MAX" where NAME_MAX is
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used for the basename value in the clear-locks CLI:
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'gluster volume clear-locks VOLNAME path kind {blocked | granted | all} {inode range | entry basename | posix range}'
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But that can be done some other day.
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Fixes: CVE-2018-14652
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BUG: 1634669
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Change-Id: I101693e91f9ea2bd26cef6c0b7d82527fefcb3e2
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Signed-off-by: Ravishankar N <ravishankar@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/152038
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Reviewed-by: Amar Tumballi <amarts@redhat.com>
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Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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xlators/features/locks/src/posix.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/xlators/features/locks/src/posix.c b/xlators/features/locks/src/posix.c
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index 63bcf31..63f914c 100644
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--- a/xlators/features/locks/src/posix.c
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+++ b/xlators/features/locks/src/posix.c
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@@ -1120,7 +1120,10 @@ pl_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
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goto out;
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}
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- strncpy (key, name, strlen (name));
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+ if (snprintf(key, sizeof(key), "%s", name) >= sizeof(key)) {
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+ op_ret = -1;
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+ goto out;
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+ }
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if (dict_set_dynstr (dict, key, lk_summary)) {
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op_ret = -1;
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op_errno = ENOMEM;
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--
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1.8.3.1
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