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-rw-r--r--gnu/packages/patches/glibc-CVE-2012-3406.patch282
1 files changed, 282 insertions, 0 deletions
diff --git a/gnu/packages/patches/glibc-CVE-2012-3406.patch b/gnu/packages/patches/glibc-CVE-2012-3406.patch
new file mode 100644
index 0000000000..9147a2aeee
--- /dev/null
+++ b/gnu/packages/patches/glibc-CVE-2012-3406.patch
@@ -0,0 +1,282 @@
+Fix CVE-2012-3406: Stack overflow in vfprintf [BZ #16617]
+
+Note: Here the ChangeLog and NEWS updates are removed from Jeff's
+ patch, since they depend on other earlier commits.
+
+From: Jeff Law <law@redhat.com>
+Date: Mon, 15 Dec 2014 09:09:32 +0000 (+0100)
+Subject: CVE-2012-3406: Stack overflow in vfprintf [BZ #16617]
+X-Git-Url: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff_plain;h=a3a1f4163c4d0f9a36056c8640661a88674ae8a2
+
+CVE-2012-3406: Stack overflow in vfprintf [BZ #16617]
+
+A larger number of format specifiers coudld cause a stack overflow,
+potentially allowing to bypass _FORTIFY_SOURCE format string
+protection.
+
+(cherry picked from commit a5357b7ce2a2982c5778435704bcdb55ce3667a0)
+(cherry picked from commit ae61fc7b33d9d99d2763c16de8275227dc9748ba)
+
+Conflicts:
+ NEWS
+---
+
+diff --git a/stdio-common/Makefile b/stdio-common/Makefile
+index 5f8e534..e5e45b6 100644
+--- 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 bug26
+
+ test-srcs = tst-unbputc tst-printf
+
+diff --git a/stdio-common/bug23-2.c b/stdio-common/bug23-2.c
+new file mode 100644
+index 0000000..9e0cfe6
+--- /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"
+diff --git a/stdio-common/bug23-3.c b/stdio-common/bug23-3.c
+new file mode 100644
+index 0000000..57c8cef
+--- /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"
+diff --git a/stdio-common/bug23-4.c b/stdio-common/bug23-4.c
+new file mode 100644
+index 0000000..a478564
+--- /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;
++}
+diff --git a/stdio-common/vfprintf.c b/stdio-common/vfprintf.c
+index c4ff833..429a3d1 100644
+--- 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))
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