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After the addition of a configuration option for
enabling the support of /etc/ld.so.cache, I thought
it might be a good idea to add one for the support
of the /etc/ld.so.preload file too. So here it is.
While doing this, I also noticed that the dynamic
linker would hang indefinitely if either LD_PRELOAD
or /etc/ld.so.preload contained a library which was
already loaded, so I made a patch for that too.
And of course, I could not resist from doing a little
clean up of comments and indentation, so here is a
patch for that too.
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This needs testing with apps that have complex dependencies.
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Now all functions and vaiables can be made static to reduce relocs.
Basicly, all variables should be merged into one struct variable
and then export that struct. Exported functions should be exported
as functions pointers in the above struct. This will reduce the
number of relocs inside ldso to a handful.
Add -Bsymbolic to linker for ldso. This will resolve all functions
(all JMP_SLOT goes away) and the remaining relocs are transformed into
RELATIVE relocs.
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misread this code and removed it, sorry.
I printed the values of _dl_brkp and _dl_envp in ldso and
got this when executing:
ls:
__curbrk: 0x300c16e0
__environ: 0x1008372c
ldd:
__curbrk: 0x300776e0
__environ: 0x3007759c
why is__environ in the app when executing ls but not ldd?
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the whole lot in a single pass.
-Erik
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This removes some crap in libdl.c(and future libs which needs
to access ldso functions).
What do you think?
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only the global GOT entry relocations for the loaded shared libs were being
handled. This made applications segfault when using un-fixedup symbols. After
many hours debugging to track down the problem, this patch makes the mips port
happy again.
-Erik
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Remove unused function parameter in ldso.
Remove echo option '-e' since it is not supported on Solaris.
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to use '_dl_pagesize'
-Erik
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is needed if ldso should use libcs malloc whenever possible.
Fix RTLD_LAZY propagation to RTLD_NOW relocation when requested by
libdl.
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Don't' use atexit in libdl.
Make destrutor in libdl actually run and to dlclose all
dlopened libs.
Remove dlclosed libs from the _dl_symbol_tables list.
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However RTLD_LOCAL still doesn't work. Everything is RTLD_GLOBAL.
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Some utilities, such as valgrind, have a legitimate reason to know the address
of the current brk. Since we know such utils will peek under our skirt, we
might as well give them what they expect and not use a gratuitously different
symbol name.
-Erik
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rather than _dl_malloc, fprintf rather than _dl_printf, etc.
-Erik
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tree. Bad boy, No doughnut.
-Erik
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aligned pointer that may be aligned up to page_size. Also add _dl_free,
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useful syscall failure diagnostics.
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hard coded 4096 instead of PAGE_SIZE. Because I'm an idiot.
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by extracting the value from the ELF header.
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lookup on 'atexit' got me excited and I started fixing the same
problem elsewhere. Except these were correct as-was, and were
not a problem....
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Hi it is me again.
This is the latest ldso patch. the NEW weak symbol handling works now
with a little special handling in _dl_find_hash(). You get to chose
if you want the new or old handling :)
There was 2 missing _dl_check_if_named_library_is_loaded() calls in _dlopen().
I then disabled the _dl_check_if_named_library_is_loaded() in dl-elf.c since
it is rendundant.
Question, why does some _dl_linux_resolver(), like i386, have 2 calls
to _dl_find_hash()? I think that is wrong, isn't it?
I really hope you can check this out soon ...
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till I properly finish the next step in my evil plan.
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location for this stuff
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to make it easier to treat it specially while not bothering the
rest of the code with the same constraints.
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Hello,
the attached patch fixes ldso compilation on sparc-linux (at least with
sparc32 userland). It was made against uClibc 0.9.21, but it's still OK
with 0.9.26.
There were three problems:
- missing __NR_getpid definition
- conflicting prototypes in elfinterp.c
- syntax error (missing semicolon) in ldso.c
With this patch shared libraries and ldso can be built on sparc.
It contains also ldso.c syntax fix for m68k - there was the same
mistake two lines earlier; but I didn't test build on m68k.
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do both operations in a single pass.
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Hello Erik!
I have made some cosmetical changes to the files, removed the added
SCRT=-fPIC option from building the crt0.S file (but it is a requirement
to build them with -fPIC), and changed some comments. I have left the
ldso.c patch with PIE_SUPPORT ifdefs, but consider applying it w/o them
(see some earlier comment from PaX Team on this issue, as it is considered
a bug). To have it work correctly, you'll also need removing
COMPLETELY_PIC.
One thing is missing: PIE_SUPPORT should be usable only for i386 (for
now).
Also added the support for propolice protection (that works for me and
catches memcpy/strcpy attacks (but needs a special gcc version).
Thanks, Peter
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For sh64 we need implicit access to the symtab, primarily to get at the
->st_other value. This presently isn't possible, as PERFORM_BOOTSTRAP_RELOC()
is invoked as such:
PERFORM_BOOTSTRAP_RELOC(rpnt, reloc_addr, symbol_addr, load_addr);
while we can easily get the symtab_index value from rpnt->r_info, this still
doesn't buy us easy access to the actual table. As such, I've modified
PERFORM_BOOTSTRAP_RELOC() to take an additional SYMTAB argument. Most
architectures aren't going to care about this, but unfortunately we don't
have any other options for sh64.
The following patch fixes up the API for what we need for sh64, and updates
the other architectures appropriately.
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chance of actually working
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path to the target library
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