* [gentoo-commits] gentoo-x86 commit in sys-freebsd/freebsd-ubin/files: freebsd-ubin-8.2-compress.patch
@ 2012-04-02 10:22 Naohiro Aota (naota)
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From: Naohiro Aota (naota) @ 2012-04-02 10:22 UTC (permalink / raw
To: gentoo-commits
naota 12/04/02 10:22:58
Added: freebsd-ubin-8.2-compress.patch
Log:
Add patch to fix CVE-2011-2895. #408887
(Portage version: 2.2.0_alpha89/cvs/FreeBSD i386)
Revision Changes Path
1.1 sys-freebsd/freebsd-ubin/files/freebsd-ubin-8.2-compress.patch
file : http://sources.gentoo.org/viewvc.cgi/gentoo-x86/sys-freebsd/freebsd-ubin/files/freebsd-ubin-8.2-compress.patch?rev=1.1&view=markup
plain: http://sources.gentoo.org/viewvc.cgi/gentoo-x86/sys-freebsd/freebsd-ubin/files/freebsd-ubin-8.2-compress.patch?rev=1.1&content-type=text/plain
Index: freebsd-ubin-8.2-compress.patch
===================================================================
Index: usr.bin/compress/zopen.c
===================================================================
--- usr.bin/compress/zopen.c (revision 225020)
+++ usr.bin/compress/zopen.c (working copy)
@@ -486,7 +486,7 @@ zread(void *cookie, char *rbp, int num)
block_compress = maxbits & BLOCK_MASK;
maxbits &= BIT_MASK;
maxmaxcode = 1L << maxbits;
- if (maxbits > BITS) {
+ if (maxbits > BITS || maxbits < 12) {
errno = EFTYPE;
return (-1);
}
@@ -513,17 +513,28 @@ zread(void *cookie, char *rbp, int num)
for (code = 255; code >= 0; code--)
tab_prefixof(code) = 0;
clear_flg = 1;
- free_ent = FIRST - 1;
- if ((code = getcode(zs)) == -1) /* O, untimely death! */
- break;
+ free_ent = FIRST;
+ oldcode = -1;
+ continue;
}
incode = code;
- /* Special case for KwKwK string. */
+ /* Special case for kWkWk string. */
if (code >= free_ent) {
+ if (code > free_ent || oldcode == -1) {
+ /* Bad stream. */
+ errno = EINVAL;
+ return (-1);
+ }
*stackp++ = finchar;
code = oldcode;
}
+ /*
+ * The above condition ensures that code < free_ent.
+ * The construction of tab_prefixof in turn guarantees that
+ * each iteration decreases code and therefore stack usage is
+ * bound by 1 << BITS - 256.
+ */
/* Generate output characters in reverse order. */
while (code >= 256) {
@@ -540,7 +551,7 @@ middle: do {
} while (stackp > de_stack);
/* Generate the new entry. */
- if ((code = free_ent) < maxmaxcode) {
+ if ((code = free_ent) < maxmaxcode && oldcode != -1) {
tab_prefixof(code) = (u_short) oldcode;
tab_suffixof(code) = finchar;
free_ent = code + 1;
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2012-04-02 10:22 [gentoo-commits] gentoo-x86 commit in sys-freebsd/freebsd-ubin/files: freebsd-ubin-8.2-compress.patch Naohiro Aota (naota)
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