Author: aurel32
Date: 2015-01-31 23:20:09 +0000 (Sat, 31 Jan 2015)
New Revision: 6348
Added:
glibc-package/trunk/debian/patches/any/cvs-vfprintf.diff
Modified:
glibc-package/trunk/debian/changelog
glibc-package/trunk/debian/patches/series
Log:
debian/patches/any/cvs-vfprintf.diff: new patch from ustream to fix a
stack overflow in vfprintf (CVE-2012-3406). Closes: #681888.
Modified: glibc-package/trunk/debian/changelog
===================================================================
--- glibc-package/trunk/debian/changelog 2015-01-31 23:11:50 UTC (rev
6347)
+++ glibc-package/trunk/debian/changelog 2015-01-31 23:20:09 UTC (rev
6348)
@@ -27,6 +27,8 @@
command execution in wordexp() with WRDE_NOCMD specified (CVS-2014-7817).
* debian/patches/any/cvs-getnetbyname.diff: new patch from upstream to fix
an infinite loop in getnetbyname (CVE-2014-9402). Closes: #775572.
+ * debian/patches/any/cvs-vfprintf.diff: new patch from ustream to fix a
+ stack overflow in vfprintf (CVE-2012-3406). Closes: #681888.
* debian/patches/git-updates.diff: update to the latest commit of the 2.19
branch to fix a few buffer overflow, unbounded stack allocation or memory
leaks that have not been (yet ?) tagged as security issue. This branch
Added: glibc-package/trunk/debian/patches/any/cvs-vfprintf.diff
===================================================================
--- glibc-package/trunk/debian/patches/any/cvs-vfprintf.diff
(rev 0)
+++ glibc-package/trunk/debian/patches/any/cvs-vfprintf.diff 2015-01-31
23:20:09 UTC (rev 6348)
@@ -0,0 +1,255 @@
+2014-12-15 Jeff Law <[email protected]>
+
+ [BZ #16617]
+ * stdio-common/vfprintf.c (vfprintf): Allocate large specs array
+ on the heap. (CVE-2012-3406)
+ * stdio-common/bug23-2.c, stdio-common/bug23-3.c: New file.
+ * stdio-common/bug23-4.c: New file. Test case by Joseph Myers.
+ * stdio-common/Makefile (tests): Add bug23-2, bug23-3, bug23-4.
+
+--- a/stdio-common/Makefile
++++ b/stdio-common/Makefile
+@@ -57,7 +57,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
+ bug19 bug19a tst-popen2 scanf13 scanf14 scanf15 bug20 bug21 bug22 \
+ scanf16 scanf17 tst-setvbuf1 tst-grouping bug23 bug24 \
+ bug-vfprintf-nargs tst-long-dbl-fphex tst-fphex-wide tst-sprintf3 \
+- bug25 tst-printf-round bug26
++ bug25 tst-printf-round bug23-2 bug23-3 bug23-4
+
+ test-srcs = tst-unbputc tst-printf
+
+--- /dev/null
++++ b/stdio-common/bug23-2.c
+@@ -0,0 +1,70 @@
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
++
++static const char expected[] = "\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55\
++\n\
++a\n\
++abbcd55%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
++
++static int
++do_test (void)
++{
++ char *buf = malloc (strlen (expected) + 1);
++ snprintf (buf, strlen (expected) + 1,
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n",
++ "a", "b", "c", "d", 5);
++ return strcmp (buf, expected) != 0;
++}
++
++#define TEST_FUNCTION do_test ()
++#include "../test-skeleton.c"
+--- /dev/null
++++ b/stdio-common/bug23-3.c
+@@ -0,0 +1,50 @@
++#include <stdio.h>
++#include <string.h>
++#include <stdlib.h>
++
++int
++do_test (void)
++{
++ size_t instances = 16384;
++#define X0 "\n%1$s\n" "%1$s" "%2$s" "%2$s" "%3$s" "%4$s" "%5$d" "%5$d"
++ const char *item = "\na\nabbcd55";
++#define X3 X0 X0 X0 X0 X0 X0 X0 X0
++#define X6 X3 X3 X3 X3 X3 X3 X3 X3
++#define X9 X6 X6 X6 X6 X6 X6 X6 X6
++#define X12 X9 X9 X9 X9 X9 X9 X9 X9
++#define X14 X12 X12 X12 X12
++#define TRAILER "%%%%%%%%%%%%%%%%%%%%%%%%%%"
++#define TRAILER2 TRAILER TRAILER
++ size_t length = instances * strlen (item) + strlen (TRAILER) + 1;
++
++ char *buf = malloc (length + 1);
++ snprintf (buf, length + 1,
++ X14 TRAILER2 "\n",
++ "a", "b", "c", "d", 5);
++
++ const char *p = buf;
++ size_t i;
++ for (i = 0; i < instances; ++i)
++ {
++ const char *expected;
++ for (expected = item; *expected; ++expected)
++ {
++ if (*p != *expected)
++ {
++ printf ("mismatch at offset %zu (%zu): expected %d, got %d\n",
++ (size_t) (p - buf), i, *expected & 0xFF, *p & 0xFF);
++ return 1;
++ }
++ ++p;
++ }
++ }
++ if (strcmp (p, TRAILER "\n") != 0)
++ {
++ printf ("mismatch at trailer: [%s]\n", p);
++ return 1;
++ }
++ free (buf);
++ return 0;
++}
++#define TEST_FUNCTION do_test ()
++#include "../test-skeleton.c"
+--- /dev/null
++++ b/stdio-common/bug23-4.c
+@@ -0,0 +1,31 @@
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
++#include <sys/resource.h>
++
++#define LIMIT 1000000
++
++int
++main (void)
++{
++ struct rlimit lim;
++ getrlimit (RLIMIT_STACK, &lim);
++ lim.rlim_cur = 1048576;
++ setrlimit (RLIMIT_STACK, &lim);
++ char *fmtstr = malloc (4 * LIMIT + 1);
++ if (fmtstr == NULL)
++ abort ();
++ char *output = malloc (LIMIT + 1);
++ if (output == NULL)
++ abort ();
++ for (size_t i = 0; i < LIMIT; i++)
++ memcpy (fmtstr + 4 * i, "%1$d", 4);
++ fmtstr[4 * LIMIT] = '\0';
++ int ret = snprintf (output, LIMIT + 1, fmtstr, 0);
++ if (ret != LIMIT)
++ abort ();
++ for (size_t i = 0; i < LIMIT; i++)
++ if (output[i] != '0')
++ abort ();
++ return 0;
++}
+--- a/stdio-common/vfprintf.c
++++ b/stdio-common/vfprintf.c
+@@ -263,6 +263,12 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap)
+ /* For the argument descriptions, which may be allocated on the heap. */
+ void *args_malloced = NULL;
+
++ /* For positional argument handling. */
++ struct printf_spec *specs;
++
++ /* Track if we malloced the SPECS array and thus must free it. */
++ bool specs_malloced = false;
++
+ /* This table maps a character into a number representing a
+ class. In each step there is a destination label for each
+ class. */
+@@ -1679,8 +1685,8 @@ do_positional:
+ size_t nspecs = 0;
+ /* A more or less arbitrary start value. */
+ size_t nspecs_size = 32 * sizeof (struct printf_spec);
+- struct printf_spec *specs = alloca (nspecs_size);
+
++ specs = alloca (nspecs_size);
+ /* The number of arguments the format string requests. This will
+ determine the size of the array needed to store the argument
+ attributes. */
+@@ -1721,11 +1727,39 @@ do_positional:
+ if (nspecs * sizeof (*specs) >= nspecs_size)
+ {
+ /* Extend the array of format specifiers. */
++ if (nspecs_size * 2 < nspecs_size)
++ {
++ __set_errno (ENOMEM);
++ done = -1;
++ goto all_done;
++ }
+ struct printf_spec *old = specs;
+- specs = extend_alloca (specs, nspecs_size, 2 * nspecs_size);
++ if (__libc_use_alloca (2 * nspecs_size))
++ specs = extend_alloca (specs, nspecs_size, 2 * nspecs_size);
++ else
++ {
++ nspecs_size *= 2;
++ specs = malloc (nspecs_size);
++ if (specs == NULL)
++ {
++ __set_errno (ENOMEM);
++ specs = old;
++ done = -1;
++ goto all_done;
++ }
++ }
+
+ /* Copy the old array's elements to the new space. */
+ memmove (specs, old, nspecs * sizeof (*specs));
++
++ /* If we had previously malloc'd space for SPECS, then
++ release it after the copy is complete. */
++ if (specs_malloced)
++ free (old);
++
++ /* Now set SPECS_MALLOCED if needed. */
++ if (!__libc_use_alloca (nspecs_size))
++ specs_malloced = true;
+ }
+
+ /* Parse the format specifier. */
+@@ -2046,6 +2080,8 @@ do_positional:
+ }
+
+ all_done:
++ if (specs_malloced)
++ free (specs);
+ if (__glibc_unlikely (args_malloced != NULL))
+ free (args_malloced);
+ if (__glibc_unlikely (workstart != NULL))
Modified: glibc-package/trunk/debian/patches/series
===================================================================
--- glibc-package/trunk/debian/patches/series 2015-01-31 23:11:50 UTC (rev
6347)
+++ glibc-package/trunk/debian/patches/series 2015-01-31 23:20:09 UTC (rev
6348)
@@ -266,3 +266,4 @@
any/cvs-regex-alloca.diff
any/cvs-wordexp.diff
any/cvs-getnetbyname.diff
+any/cvs-vfprintf.diff
--
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