Re: PATCH: Update DF_1_XXX from Solaris

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Wed, Nov 21, 2012 at 10:23 AM, Markus Trippelsdorf
<markus@trippelsdorf.de> wrote:
> On 2012.11.16 at 08:49 -0800, H.J. Lu wrote:
>>
>> Here is the new patch.  However, I'd like to fix
>>
>> http://www.sourceware.org/bugzilla/show_bug.cgi?id=14853
>>
>> so that we can add DF_1_GLOBAL to supported bits.  To test
>> it, I need to add a "-z global" linker option to set DF_1_GLOBAL.
>
> This breaks valgrind on my system (Linux amd64):
>
> Inconsistency detected by ld.so: get-dynamic-info.h: 155: elf_get_dynamic_info: Assertion `(l->l_flags_1 & ~(0x00000001 | 0x00000008 | 0x00000020 | 0x00000040 | 0x00000080 | 0x00000800)) == 0' failed!
> ==18162== Jump to the invalid address stated on the next line
> ==18162==    at 0x546: ???
> ==18162==    by 0x40155C8: __assert_fail (dl-minimal.c:206)
> ==18162==    by 0x4006E29: _dl_map_object_from_fd (get-dynamic-info.h:155)
> ==18162==    by 0x4007EDC: _dl_map_object (dl-load.c:2365)
> ==18162==    by 0x40013FD: map_doit (rtld.c:626)
> ==18162==    by 0x400E445: _dl_catch_error (dl-error.c:177)
> ==18162==    by 0x4000F4D: do_preload (rtld.c:815)
> ==18162==    by 0x4003294: dl_main (rtld.c:1629)
> ==18162==    by 0x4014D3D: _dl_sysdep_start (dl-sysdep.c:241)
> ==18162==    by 0x4004A35: _dl_start (rtld.c:331)
> ==18162==    by 0x4001217: ??? (in /lib64/ld-2.16.90.so)
> ==18162==    by 0xF: ???
> ==18162==  Address 0x546 is not stack'd, malloc'd or (recently) free'd
> ==18162==
> ==18162==
> ==18162== Process terminating with default action of signal 11 (SIGSEGV)
> ==18162==  Bad permissions for mapped region at address 0x546
> ==18162==    at 0x546: ???
> ==18162==    by 0x40155C8: __assert_fail (dl-minimal.c:206)
> ==18162==    by 0x4006E29: _dl_map_object_from_fd (get-dynamic-info.h:155)
> ==18162==    by 0x4007EDC: _dl_map_object (dl-load.c:2365)
> ==18162==    by 0x40013FD: map_doit (rtld.c:626)
> ==18162==    by 0x400E445: _dl_catch_error (dl-error.c:177)
> ==18162==    by 0x4000F4D: do_preload (rtld.c:815)
> ==18162==    by 0x4003294: dl_main (rtld.c:1629)
> ==18162==    by 0x4014D3D: _dl_sysdep_start (dl-sysdep.c:241)
> ==18162==    by 0x4004A35: _dl_start (rtld.c:331)
> ==18162==    by 0x4001217: ??? (in /lib64/ld-2.16.90.so)
> ==18162==    by 0xF: ???
>

That is exactly the problem my patch tries to catch:

[hjl@gnu-6 valgrind]$ readelf -d
/usr/lib64/valgrind/vgpreload_memcheck-x86-linux.so | grep FLAGS_1
 0x6ffffffb (FLAGS_1)                    Flags: INITFIRST INTERPOSE
[hjl@gnu-6 valgrind]$

We don't support INTERPOSE.  We used to ignore it.  What should we
do when seeing an unsupported DF_1_XXX bit?


-- 
H.J.