Attachment 14814 Details for Bug 13773 – patch from Lukas Slebodnik

[patch] patch from Lukas Slebodnik

0001-ldb-Out-ouf-bound-read-in-ldb_wildcard_compare.patch (text/plain), 4.25 KB, created by Andrew Bartlett on 2019-02-01 04:09:01 UTC

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Creator: Andrew Bartlett

Created: 2019-02-01 04:09:01 UTC

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patch

obsolete

>From cfa944ea7a2fa5a0e5feb629260f901cb4e8e81f Mon Sep 17 00:00:00 2001
>From: Lukas Slebodnik <lslebodn@fedoraproject.org>
>Date: Fri, 18 Jan 2019 16:37:24 +0100
>Subject: [PATCH] ldb: Out ouf bound read in ldb_wildcard_compare
>
>There is valgrind error in few tests tests/test-generic.sh
> 91 echo "Test wildcard match"
> 92 $VALGRIND ldbadd $LDBDIR/tests/test-wildcard.ldif  || exit 1
> 93 $VALGRIND ldbsearch '(cn=test*multi)'  || exit 1
> 95 $VALGRIND ldbsearch '(cn=*test_multi)'  || exit 1
> 97 $VALGRIND ldbsearch '(cn=test*multi*test*multi)'  || exit 1
>
>e.g.
>  ==3098== Memcheck, a memory error detector
>  ==3098== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
>  ==3098== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
>  ==3098== Command: ./bin/ldbsearch (cn=test*multi)
>  ==3098==
>  ==3098== Invalid read of size 1
>  ==3098==    at 0x483CEE7: memchr (vg_replace_strmem.c:890)
>  ==3098==    by 0x49A9073: memmem (in /usr/lib64/libc-2.28.9000.so)
>  ==3098==    by 0x485DFE9: ldb_wildcard_compare (ldb_match.c:313)
>  ==3098==    by 0x485DFE9: ldb_match_substring (ldb_match.c:360)
>  ==3098==    by 0x485DFE9: ldb_match_message (ldb_match.c:572)
>  ==3098==    by 0x558F8FA: search_func (ldb_kv_search.c:549)
>  ==3098==    by 0x48C78CA: ??? (in /usr/lib64/libtdb.so.1.3.17)
>  ==3098==    by 0x48C7A60: tdb_traverse_read (in /usr/lib64/libtdb.so.1.3.17)
>  ==3098==    by 0x557B7C4: ltdb_traverse_fn (ldb_tdb.c:274)
>  ==3098==    by 0x558FBFA: ldb_kv_search_full (ldb_kv_search.c:594)
>  ==3098==    by 0x558FBFA: ldb_kv_search (ldb_kv_search.c:854)
>  ==3098==    by 0x558E497: ldb_kv_callback (ldb_kv.c:1713)
>  ==3098==    by 0x48FCD58: tevent_common_invoke_timer_handler (in /usr/lib64/libtevent.so.0.9.38)
>  ==3098==    by 0x48FCEFD: tevent_common_loop_timer_delay (in /usr/lib64/libtevent.so.0.9.38)
>  ==3098==    by 0x48FE14A: ??? (in /usr/lib64/libtevent.so.0.9.38)
>  ==3098==  Address 0x4b4ab81 is 0 bytes after a block of size 129 alloc'd
>  ==3098==    at 0x483880B: malloc (vg_replace_malloc.c:309)
>  ==3098==    by 0x491048B: talloc_strndup (in /usr/lib64/libtalloc.so.2.1.15)
>  ==3098==    by 0x48593CA: ldb_casefold_default (ldb_utf8.c:59)
>  ==3098==    by 0x485F68D: ldb_handler_fold (attrib_handlers.c:64)
>  ==3098==    by 0x485DB88: ldb_wildcard_compare (ldb_match.c:257)
>  ==3098==    by 0x485DB88: ldb_match_substring (ldb_match.c:360)
>  ==3098==    by 0x485DB88: ldb_match_message (ldb_match.c:572)
>  ==3098==    by 0x558F8FA: search_func (ldb_kv_search.c:549)
>  ==3098==    by 0x48C78CA: ??? (in /usr/lib64/libtdb.so.1.3.17)
>  ==3098==    by 0x48C7A60: tdb_traverse_read (in /usr/lib64/libtdb.so.1.3.17)
>  ==3098==    by 0x557B7C4: ltdb_traverse_fn (ldb_tdb.c:274)
>  ==3098==    by 0x558FBFA: ldb_kv_search_full (ldb_kv_search.c:594)
>  ==3098==    by 0x558FBFA: ldb_kv_search (ldb_kv_search.c:854)
>  ==3098==    by 0x558E497: ldb_kv_callback (ldb_kv.c:1713)
>  ==3098==    by 0x48FCD58: tevent_common_invoke_timer_handler (in /usr/lib64/libtevent.so.0.9.38)
>  ==3098==
>  # record 1
>  dn: cn=test_multi_test_multi_test_multi,o=University of Michigan,c=TEST
>  cn: test_multi_test_multi_test_multi
>  description: test multi wildcards matching
>  objectclass: person
>  sn: multi_test
>  name: test_multi_test_multi_test_multi
>  distinguishedName: cn=test_multi_test_multi_test_multi,o=University of Michiga
>   n,c=TEST
>
>  # returned 1 records
>  # 1 entries
>  # 0 referrals
>
>Signed-off-by: Lukas Slebodnik <lslebodn@fedoraproject.org>
>---
> lib/ldb/common/ldb_match.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>diff --git a/lib/ldb/common/ldb_match.c b/lib/ldb/common/ldb_match.c
>index 25fe3f9c21b14c23696eecd700b2170b0c3b1981..8eeedfb12e0600cdec7431a10fde8bdf9dcb2bd8 100644
>--- a/lib/ldb/common/ldb_match.c
>+++ b/lib/ldb/common/ldb_match.c
>@@ -308,9 +308,10 @@ static int ldb_wildcard_compare(struct ldb_context *ldb,
> 		if (p == NULL) goto mismatch;
> 		if ( (! tree->u.substring.chunks[c + 1]) && (! tree->u.substring.end_with_wildcard) ) {
> 			uint8_t *g;
>+			uint8_t *end = val.data + val.length;
> 			do { /* greedy */
> 				g = memmem(p + cnk.length,
>-					val.length - (p - val.data),
>+					end - (p + cnk.length),
> 					(const uint8_t *)cnk.data,
> 					cnk.length);
> 				if (g) p = g;
>-- 
>2.20.1
>
>

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