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Fix illegal memory accesses by readelf when parsing corrupt IA64 unwind information. 

PR 24247
	* unwind-ia64.c: Include sysdep.h.
	(unw_decode_x1): Check current pointer against end pointer before
	accessing memory.
	(unw_decode_x2): Likewise.
	(unw_decode_x3): Likewise.
	(unw_decode_x4): Likewise.
	(unw_decode_r2): Likewise.
	(unw_decode_p2_p5): Likewise.
	(unw_decode_p7_p10): Likewise.
	(unw_decode): Likewise.
This commit is contained in:
Nick Clifton 2019-02-21 10:54:12 +00:00
parent 160eba9301
commit 5cacf1c88f
2 changed files with 94 additions and 6 deletions
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14
binutils/ChangeLog
View File

@ -1,3 +1,17 @@
2019-02-21 Nick Clifton <nickc@redhat.com>
PR 24247
* unwind-ia64.c: Include sysdep.h.
(unw_decode_x1): Check current pointer against end pointer before
accessing memory.
(unw_decode_x2): Likewise.
(unw_decode_x3): Likewise.
(unw_decode_x4): Likewise.
(unw_decode_r2): Likewise.
(unw_decode_p2_p5): Likewise.
(unw_decode_p7_p10): Likewise.
(unw_decode): Likewise.
2019-02-20 Nick Clifton <nickc@redhat.com>
PR 24246

86
binutils/unwind-ia64.c
View File

@ -21,9 +21,8 @@
MA 02110-1301, USA. */
#include "config.h"
#include "sysdep.h"
#include "unwind-ia64.h"
#include <stdio.h>
#include <string.h>
#if __GNUC__ >= 2
/* Define BFD64 here, even if our default architecture is 32 bit ELF
@ -174,7 +173,7 @@ unw_print_xyreg (char *cp, unsigned int x, unsigned int ytreg)
typedef bfd_vma unw_word;
#define UNW_DEC_BAD_CODE(code) \
printf ("Unknown code 0x%02x\n", code)
printf (_("Unknown code 0x%02x\n"), code)
#define UNW_DEC_PROLOGUE(fmt, body, rlen, arg) \
do \
@ -360,7 +359,7 @@ typedef bfd_vma unw_word;
/* PR 18420. */ \
if ((dp + (unw_rlen / 4)) > end) \
{ \
printf ("\nERROR: unwind length too long (0x%lx > 0x%lx)\n\n",\
printf (_("\nERROR: unwind length too long (0x%lx > 0x%lx)\n\n"), \
(long) (unw_rlen / 4), (long)(end - dp)); \
/* FIXME: Should we reset unw_rlen ? */ \
break; \
@ -571,6 +570,12 @@ unw_decode_x1 (const unsigned char *dp, unsigned int code ATTRIBUTE_UNUSED,
unsigned char byte1, abreg;
unw_word t, off;
if ((end - dp) < 3)
{
printf (_("\t<corrupt X1>\n"));
return end;
}
byte1 = *dp++;
t = unw_decode_uleb128 (&dp, end);
off = unw_decode_uleb128 (&dp, end);
@ -589,6 +594,12 @@ unw_decode_x2 (const unsigned char *dp, unsigned int code ATTRIBUTE_UNUSED,
unsigned char byte1, byte2, abreg, x, ytreg;
unw_word t;
if ((end - dp) < 3)
{
printf (_("\t<corrupt X2>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
t = unw_decode_uleb128 (&dp, end);
@ -609,6 +620,12 @@ unw_decode_x3 (const unsigned char *dp, unsigned int code ATTRIBUTE_UNUSED,
unsigned char byte1, byte2, abreg, qp;
unw_word t, off;
if ((end - dp) < 4)
{
printf (_("\t<corrupt X3>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
t = unw_decode_uleb128 (&dp, end);
@ -631,6 +648,12 @@ unw_decode_x4 (const unsigned char *dp, unsigned int code ATTRIBUTE_UNUSED,
unsigned char byte1, byte2, byte3, qp, abreg, x, ytreg;
unw_word t;
if ((end - dp) < 4)
{
printf (_("\t<corrupt X4>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
byte3 = *dp++;
@ -667,6 +690,12 @@ unw_decode_r2 (const unsigned char *dp, unsigned int code, void *arg,
unsigned char byte1, mask, grsave;
unw_word rlen;
if ((end - dp) < 2)
{
printf (_("\t<corrupt R2>\n"));
return end;
}
byte1 = *dp++;
mask = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
@ -705,14 +734,30 @@ unw_decode_p2_p5 (const unsigned char *dp, unsigned int code,
{
if ((code & 0x10) == 0)
{
unsigned char byte1 = *dp++;
unsigned char byte1;
if ((end - dp) < 1)
{
printf (_("\t<corrupt P2>\n"));
return end;
}
byte1 = *dp++;
UNW_DEC_BR_GR ("P2", ((code & 0xf) << 1) | ((byte1 >> 7) & 1),
(byte1 & 0x7f), arg);
}
else if ((code & 0x08) == 0)
{
unsigned char byte1 = *dp++, r, dst;
unsigned char byte1, r, dst;
if ((end - dp) < 1)
{
printf (_("\t<corrupt P3>\n"));
return end;
}
byte1 = *dp++;
r = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
dst = (byte1 & 0x7f);
@ -765,6 +810,11 @@ unw_decode_p2_p5 (const unsigned char *dp, unsigned int code,
{
unw_word grmask, frmask, byte1, byte2, byte3;
if ((end - dp) < 3)
{
printf (_("\t<corrupt P5>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
byte3 = *dp++;
@ -867,6 +917,12 @@ unw_decode_p7_p10 (const unsigned char *dp, unsigned int code, void *arg,
{
case 0x0: /* p8 */
{
if ((end - dp) < 2)
{
printf (_("\t<corrupt P8>\n"));
return end;
}
r = *dp++;
t = unw_decode_uleb128 (&dp, end);
switch (r)
@ -936,12 +992,24 @@ unw_decode_p7_p10 (const unsigned char *dp, unsigned int code, void *arg,
break;
case 0x1:
if ((end - dp) < 2)
{
printf (_("\t<corrupt P9>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
UNW_DEC_GR_GR ("P9", (byte1 & 0xf), (byte2 & 0x7f), arg);
break;
case 0xf: /* p10 */
if ((end - dp) < 2)
{
printf (_("\t<corrupt P10>\n"));
return end;
}
byte1 = *dp++;
byte2 = *dp++;
UNW_DEC_ABI ("P10", byte1, byte2, arg);
@ -1067,6 +1135,12 @@ unw_decode (const unsigned char *dp, int inside_body,
unw_decoder decoder;
unsigned char code;
if ((end - dp) < 1)
{
printf (_("\t<corrupt IA64 descriptor>\n"));
return end;
}
code = *dp++;
decoder = unw_decode_table[inside_body][code >> 5];
return (*decoder) (dp, code, ptr_inside_body, end);