[yocto] [prelink-cross][PATCH 1/1] rtld.c: LD_PRELOAD bugfix
Maninder Singh
maninder1.s at samsung.com
Mon Nov 9 17:05:55 PST 2015
Hello,
>On 11/7/15 5:24 AM, Maninder Singh wrote:
>> Hi,
>> Ping....
>
>I'd gotten a msg after this to hold off and wait for an update. Is this the
>updated version of the fix?
>
>--Mark
Yes, we send message for update a fix for LD_PRELOAD implemntation in prelink:-
https://lists.yoctoproject.org/pipermail/yocto/2015-September/026431.html
(LD_PRELOAD implemntation patch, which is merged with prelink_cross project)
and this below patch fixes bug in LD_PRELOAD patch (yes this is updated version of fix).
>>> This patch do following things:-
>>> 1. Fixes bug of adding preloaded libs in search scope of dependent
>>> libraries which results in search scope of few symbols becomes
>>> same for executable and library, so conflict doesn't occur for
>>> those symbols and hence resulted in less number of conflicts.
>>> 2. Reduce code redundancy.
>>> 3. Buffer Overflow fix.
>>>
>>> Signed-off-by: Maninder Singh <maninder1.s at samsung.com>
>>> Signed-off-by: Vaneet Narang <v.narang at samsung.com>
>>> Reviewed-by: Doha Hwang <doha.hwang at samsung.com>
>>> ---
>>> trunk/src/rtld/rtld.c | 27 ++++++++++++++++-----------
>>> 1 files changed, 16 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/trunk/src/rtld/rtld.c b/trunk/src/rtld/rtld.c
>>> index 50461b6..8af5052 100644
>>> --- a/trunk/src/rtld/rtld.c
>>> +++ b/trunk/src/rtld/rtld.c
>>> @@ -606,7 +606,7 @@ load_dsos (DSO *dso, int host_paths)
>>> {
>>> struct dso_list *dso_list, *dso_list_tail, *cur_dso_ent, *new_dso_ent;
>>> struct stat64 st;
>>> - int total_preload = 0;
>>> + int total_preload = 0, temp_total_preload = 0;
>>> char * libname[MAX_PRELOADED_LIBS] = {NULL};
>>>
>>> /* Assume it's static unless we find DT_NEEDED entries */
>>> @@ -632,19 +632,19 @@ load_dsos (DSO *dso, int host_paths)
>>>
>>> if(dso->ehdr.e_type == ET_EXEC && ld_preload) {
>>> char *next_lib = ld_preload;
>>> - libname[total_preload] = ld_preload;
>>> - total_preload++;
>>> - next_lib=strchr(ld_preload,':');
>>> - while(next_lib!=NULL){
>>> - *next_lib = '\0';
>>> - next_lib++;
>>> - libname[total_preload] = next_lib;
>>> - total_preload++;
>>> - next_lib=strchr(next_lib,':');
>>> - }
>>> + while(*next_lib != '\0' && (total_preload < MAX_PRELOADED_LIBS)){
>>> + libname[total_preload++] = next_lib;
>>> + next_lib=strchrnul(next_lib,':');
>>> + if(*next_lib == '\0')
>>> + break;
>>> + *next_lib = '\0';
>>> + next_lib++;
>>> + }
>>> + temp_total_preload = total_preload;
>>> }
>>> else {
>>> total_preload = 0;
>>> + temp_total_preload = 0;
>>> }
>>> while (cur_dso_ent != NULL)
>>> {
>>> @@ -666,6 +666,11 @@ load_dsos (DSO *dso, int host_paths)
>>> {
>>> int ndx, maxndx;
>>> maxndx = data->d_size / cur_dso->shdr[cur_dso->dynamic].sh_entsize;
>>> + if(!(cur_dso->ehdr.e_type == ET_EXEC))
>>> + total_preload = 0;
>>> + else
>>> + total_preload = temp_total_preload;
>>> +
>>> for (ndx = 0; ndx < maxndx + total_preload; ++ndx)
>>> {
>>>
>>> --
>>> 1.7.1
This patch is a fix to a bug of below commit (addition of new --ld-preload option):-
http://git.yoctoproject.org/cgit/cgit.cgi/prelink-cross/commit/?h=cross_prelink&id=3199ee4ebfc37288391e169825b75fa80c6136a3
and applicable after this commit
Thanks,
Maninder Singh
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