Re: libsanitizer merge from upstream r208536

[Ramana Radhakrishnan <ramana dot radhakrishnan at arm dot com>]

On 05/23/14 08:50, Yury Gribov wrote:
>   > On ARM the asan tests have always been a random generator of PASS /
>   > FAIL on qemu despite efforts to "nobble" qemu for /proc/self/maps
>   > outputs.
>
> This should improve once upstream Asan sets up an ARM build bot. This
> has been discussed recently but noone has yet volunteered to do the
> server installation and setup.
>
>   > After the merge I see these new failures instead
>
> A pity that gcc-testresults does not report mismatched lines.
>
> My guess is this is caused by some unwinding failures when reporting
> heap allocations:

Ok, so we need to fix that if there is a bug.

> $ grep -R 'allocated by thread' ./gcc/testsuite/c-c++-common/asan -l
> ./gcc/testsuite/c-c++-common/asan/strncpy-overflow-1.c
> ./gcc/testsuite/c-c++-common/asan/heap-overflow-1.c
> ./gcc/testsuite/c-c++-common/asan/use-after-free-1.c

This is what I see from the log and all failures look identical.

==14627==ERROR: AddressSanitizer: heap-buffer-overflow on address 
0x41a007fa at pc 0x88c4 bp 0xbebd0084 sp 0xbebd007c
READ of size 1 at 0x41a007fa thread T0
    #0 0x88c3 in main 
/work/gcc/gcc/testsuite/c-c++-common/asan/heap-overflow-1.c:21
    #1 0x40626631 in __libc_start_main 
(/lib/arm-linux-gnueabihf/libc.so.6+0x17631)

0x41a007fa is located 0 bytes to the right of 10-byte region 
[0x41a007f0,0x41a007fa)
allocated by thread T0 here:
    #0 0x400cd587 in __interceptor_malloc 
/work/gcc/libsanitizer/asan/asan_malloc_linux.cc:73

SUMMARY: AddressSanitizer: heap-buffer-overflow 
/work/gcc/gcc/testsuite/c-c++-common/asan/heap-overflow-1.c:21 main
Shadow bytes around the buggy address:
  0x283400a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x283400b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x283400c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x283400d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x283400e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x283400f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa 00[02]
  0x28340100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x28340110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x28340120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x28340130: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x28340140: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  ASan internal:           fe
==14627==ABORTING




> -Y