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[packages/trusty/cirros-testvm.git] / cirros-testvm / src-cirros / buildroot-2015.05 / package / glibc / 2.18-svnr23787 / 0005-CVE-2015-1472.patch

diff --git a/cirros-testvm/src-cirros/buildroot-2015.05/package/glibc/2.18-svnr23787/0005-CVE-2015-1472.patch b/cirros-testvm/src-cirros/buildroot-2015.05/package/glibc/2.18-svnr23787/0005-CVE-2015-1472.patch
new file mode 100644 (file)
index 0000000..a0da626
--- /dev/null
+++ b/cirros-testvm/src-cirros/buildroot-2015.05/package/glibc/2.18-svnr23787/0005-CVE-2015-1472.patch
@@ -0,0 +1,88 @@
+Fix CVE-2015-1472 - heap buffer overflow in wscanf
+Backport from upstream:
+https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=5bd80bfe9ca0d955bfbbc002781bc7b01b6bcb06
+See: https://bugzilla.redhat.com/show_bug.cgi?id=1188235
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+
+diff --git a/stdio-common/tst-sscanf.c b/stdio-common/tst-sscanf.c
+index aece3f2..8a2eb9e 100644
+--- a/libc/stdio-common/tst-sscanf.c
++++ b/libc/stdio-common/tst-sscanf.c
+@@ -233,5 +233,38 @@ main (void)
+       }
+     }
+ 
++  /* BZ #16618
++     The test will segfault during SSCANF if the buffer overflow
++     is not fixed.  The size of `s` is such that it forces the use
++     of malloc internally and this triggers the incorrect computation.
++     Thus the value for SIZE is arbitrariy high enough that malloc
++     is used.  */
++  {
++#define SIZE 131072
++    CHAR *s = malloc ((SIZE + 1) * sizeof (*s));
++    if (s == NULL)
++      abort ();
++    for (size_t i = 0; i < SIZE; i++)
++      s[i] = L('0');
++    s[SIZE] = L('\0');
++    int i = 42;
++    /* Scan multi-digit zero into `i`.  */
++    if (SSCANF (s, L("%d"), &i) != 1)
++      {
++      printf ("FAIL: bug16618: SSCANF did not read one input item.\n");
++      result = 1;
++      }
++    if (i != 0)
++      {
++      printf ("FAIL: bug16618: Value of `i` was not zero as expected.\n");
++      result = 1;
++      }
++    free (s);
++    if (result != 1)
++      printf ("PASS: bug16618: Did not crash.\n");
++#undef SIZE
++  }
++
++
+   return result;
+ }
+diff --git a/stdio-common/vfscanf.c b/stdio-common/vfscanf.c
+index cd129a8..0e204e7 100644
+--- a/libc/stdio-common/vfscanf.c
++++ b/libc/stdio-common/vfscanf.c
+@@ -272,9 +272,10 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
+       if (__glibc_unlikely (wpsize == wpmax))                               \
+       {                                                                   \
+         CHAR_T *old = wp;                                                 \
+-        size_t newsize = (UCHAR_MAX + 1 > 2 * wpmax                       \
+-                          ? UCHAR_MAX + 1 : 2 * wpmax);                   \
+-        if (use_malloc || !__libc_use_alloca (newsize))                   \
++        bool fits = __glibc_likely (wpmax <= SIZE_MAX / sizeof (CHAR_T) / 2); \
++        size_t wpneed = MAX (UCHAR_MAX + 1, 2 * wpmax);                   \
++        size_t newsize = fits ? wpneed * sizeof (CHAR_T) : SIZE_MAX;      \
++        if (!__libc_use_alloca (newsize))                                 \
+           {                                                               \
+             wp = realloc (use_malloc ? wp : NULL, newsize);               \
+             if (wp == NULL)                                               \
+@@ -286,14 +287,13 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
+               }                                                           \
+             if (! use_malloc)                                             \
+               MEMCPY (wp, old, wpsize);                                   \
+-            wpmax = newsize;                                              \
++            wpmax = wpneed;                                               \
+             use_malloc = true;                                            \
+           }                                                               \
+         else                                                              \
+           {                                                               \
+             size_t s = wpmax * sizeof (CHAR_T);                           \
+-            wp = (CHAR_T *) extend_alloca (wp, s,                         \
+-                                           newsize * sizeof (CHAR_T));    \
++            wp = (CHAR_T *) extend_alloca (wp, s, newsize);               \
+             wpmax = s / sizeof (CHAR_T);                                  \
+             if (old != NULL)                                              \
+               MEMCPY (wp, old, wpsize);                                   \
+-- 
+1.9.4
+