Fix stack buffer overflow in aarch64_extract_return_value

Hi,
I build GDB with -fsanitize=address, and run testsuite.  In
gdb.base/callfuncs.exp, I see the following error,

p/c fun1()
=================================================================^M
==9601==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffee858530 at pc 0x6df079 bp 0x7fffee8583a0 sp 0x7fffee858398
WRITE of size 16 at 0x7fffee858530 thread T0
    #0 0x6df078 in regcache_raw_read /home/yao/SourceCode/gnu/gdb/git/gdb/regcache.c:673
    #1 0x6dfe1e in regcache_cooked_read /home/yao/SourceCode/gnu/gdb/git/gdb/regcache.c:751
    #2 0x4696a3 in aarch64_extract_return_value /home/yao/SourceCode/gnu/gdb/git/gdb/aarch64-tdep.c:1708
    #3 0x46ae57 in aarch64_return_value /home/yao/SourceCode/gnu/gdb/git/gdb/aarch64-tdep.c:1918

We are extracting return value from V registers (128 bit), but only
allocate X_REGISTER_SIZE-byte array, which isn't sufficient.  This
patch changes the array to V_REGISTER_SIZE.

gdb:

2015-11-16  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_extract_return_value):  Change array
	buf's length to V_REGISTER_SIZE.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 30ae510..fd2ac45 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2015-11-16  Yao Qi  <yao.qi@linaro.org>
 
+       * aarch64-tdep.c (aarch64_extract_return_value):  Change array
+       buf's length to V_REGISTER_SIZE.
+
+2015-11-16  Yao Qi  <yao.qi@linaro.org>
+
        * aarch64-tdep.c (pass_in_x_or_stack): Change argument type
        from bfd_byte * to value *.  Caller updated.
        (pass_in_x): Likewise.

diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index b025eba..de045e6 100644 (file)
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -1620,7 +1620,7 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs,
       for (i = 0; i < elements; i++)
        {
          int regno = AARCH64_V0_REGNUM + i;
-         bfd_byte buf[X_REGISTER_SIZE];
+         bfd_byte buf[V_REGISTER_SIZE];
 
          if (aarch64_debug)
            {