| Age | Commit message (Collapse) | Author |
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Nowadays modern libcs like Glibc and musl currently
support processing of RELATIVE relocations compressed
with DT_RELR format. However I have noticed that uClibc-ng
doesn't support this feature and if the source will be linked with
`-Wl,-z,pack-relative-relos` (bfd) or `-Wl,--pack-dyn-relocs=relr`
(lld) then ld.so cannot properly load the produced DSO.
This patch is intended to fix this issue and adds applying
of DT_RELR relative relocation.
Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>
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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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When uclibc is built with static PIE support the _dl_load_base variable
shared between the libc-tls.c and reloc_static_pie.c creates the
dependency that requires linking reloc_static_pie.o into static
position-dependent executables resulting in the following build errors:
gcc -static test.c -o test
...ld:
...usr/lib/libc.a(reloc_static_pie.os):(.text+0x0):
undefined reference to `_DYNAMIC'
Move _dl_load_base definition to libc-tls.c to resolve this dependency
and fix static PDE build.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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on mips
Updated config to allow compilation of rcrt1.o for mips and modified it's crt1.S to perform relocates in __start.
The mips architecture performs relocations differently then most other architectures. reloc_static_pie was rewritten, taking code from dl-startup.c, in order to perfrom the additional relocations. Modifications were made to mips' dl-startup.h to allow for the use of contained macros without including _start definition.
Signed-off-by: linted <linted@users.noreply.github.com>
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on aarch64
Updated config to allow compilation of rcrt1.o for aarch64 and modified it's crt1.S to relocate dynamic section prior to __uClibc_main.
Disabled stack protector when compiling reloc_static_pie.c to avoid TLS access prior to it being setup.
Signed-off-by: linted <linted@users.noreply.github.com>
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on i386, x86_64, and arm.
This patch adds the generation of rcrt1.o which is used by gcc when compiling with the --static-pie flag.
rcrt1.o differs from crt1.o and Scrt1.o in that it the executable has a dynamic section but no relocations have been performed prior to _start being called.
crt1.o assumes there to be no dynamic relocations, and Scrt1.o has all relocations performed prior to execution by lsdo.
The new reloc_static_pie function handles parsing the dynamic section, and performing the relocations in a architecture agnostic method.
It also sets _dl_load_base which is used when initalizing TLS to ensure loading from the proper location.
This allows for easier porting of static-pie support to additional architectures as only modifications to crt1.S to find the load address are required.
Signed-off-by: linted <linted@users.noreply.github.com>
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Fixes this:
libc/misc/internals/tempname.c: In function 'brain_damaged_fillrand':
libc/misc/internals/tempname.c:155:0: warning: "L" redefined
#define L ((UINT32_MAX % NUM_LETTERS + 1) % NUM_LETTERS)
In file included from ./libpthread/nptl/sysdeps/unix/sysv/linux/lowlevellock.h:24:0,
from ./include/bits/libc-lock.h:35,
from ./include/bits/stdio-lock.h:22,
from ./include/bits/uClibc_mutex.h:73,
from ./include/bits/uClibc_stdio.h:83,
from ./include/stdio.h:71,
from libc/misc/internals/tempname.c:35:
./libc/sysdeps/linux/kvx/sysdep.h:40:0: note: this is the location of the previous definition
# define L(name) $L##name
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
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For ARCH where shared lib are not supported:
- SHARED is not set (!SHARED is true)
- __ARCH_HAS_NO_LDSO__ is set
so code inside #if !defined __ARCH_HAS_NO_LDSO__ && !defined SHARED
is compiled-out.
But without a call do _dl_aux_init(), _dl_phdr stays NULL and
__libc_setup_tls won't be able to allocate memory for the in-executable TLS
and also won't be able to load the initimage from ELF TLS segment.
This results in segfault when doing things like "errno = 0" like
in tst-cancel15.c for instance in uClibc-ng testsuite.
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
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In case __nptl_nthreads is not defined in the final binary then avoid
dereferencing the address since it's null. Anyway this means there is
no other thread and so we must exit.
* libc/misc/internals/__uClibc_main.c (__uClibc_main): Handle case
where &__nptl_nthreads is null.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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* libc/misc/internals/__uClibc_main.c (funcdesc_value): New.
(fdpic_init_array_jump): New.
(__uClibc_fini): Support __FDPIC__.
(__uClibc_main): Likewise.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Signed-off-by: mirabilos <m@mirbsd.org>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
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Revert the removal of the weak pthread functions and
guarantee a link order so that single threaded applications
doesn't link in all the pthread functions they don't use.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
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Similar to musl libc a single libc has many benefits and solves
some open issues with uClibc-ng.
- no pthread_mutex_* weak symbols exported anymore
- applications no longer failing to link when either
-lrt or -lpthread are missing for dynamic and static linking mode
- smaller C library
- slightly better runtime performance
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Nobody should use gcc 3.3 nowadays.
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Move TLS initialization for static builds up to the calling
function as suggested by Daniel Fahlgren.
Reported-By: Daniel Fahlgren <daniel@fahlgren.se>
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Change __gen_tempname() prototype in order to pass the additional
suffix lenght. In __gen_tempname() add a new check for suffixlen.
Update some comments in the code.
Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
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mkostemp(char *template, int flags) generates a unique temporary
filename from a template. The flags parameter accepts three of
the same flags as open(2): O_APPEND, O_CLOEXEC, and O_SYNC. The
current implementation of mkostemp(3) does not respect the flags
and in fact confuses the flags with the file mode which should
always be S_IRUSR | S_IWUSR. This patch corrects this issue.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
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issetugid() returns 1 if the process environment or memory address space
is considered tainted, and returns 0 otherwise. This happens, for example,
when a process's privileges are elevated by the setuid or setgid flags on
an executable belonging to root. This function first appeard in OpenBSD 2.0
and is needed for the LibreSSL.
This patch follows the same logic as the equivalent musl commit. For more
information see the commit message at
http://git.musl-libc.org/cgit/musl/commit/?id=ddddec106fd17c3aca3287005d21e92f742aa9d4
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Patch "LT.old: Make __errno_location/__h_errno_location thread safe"
uncovered yet another bug with static linking and errno (hopefully this
is last of them all).
Currently, __errno_location is declared weak but is defined strong.
While this provides with the desired weak semantics in dso, it
is subtly broken in static links.
Quoting Joern Rennecke (ARC gcc expert):
| I think the issue is that you declare the function as weak in the
| header file. That is a rare instance where you want the reference
| use declaration that differs a bit from the definition.
| If the reference uses a weakly declared function, that creates a
| weakref, i.e. the linker won't bother to look for this symbol at
| all - if it gets linked in for some other reason, fine,
| otherwise, it stays zero.
So the solution to declare strong, define weak.
Supporting data
-----------------
orig code: ARM mmap wrapper (LT.old build + my prev patch for errno)
_mmap:
@ args = 8, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
stmfd sp!, {r4, r5, r7, lr}
ldr r5, [sp, #20]
movs ip, r5, asl #20
beq .L2
bl __errno_location(PLT)
mov r3, #22
str r3, [r0, #0]
mvn r0, #0
...
...
.weak __errno_location
A statically linked hello world program which uses mmap too.
As we can see__errno_location is completely gone - which is
semantically wrong - we need functional errno.
00008274 <__GI_mmap>:
8274: e92d40b0 push {r4, r5, r7, lr}
8278: e59d5014 ldr r5, [sp, #20]
827c: e1b0ca05 lsls ip, r5, #20
8280: 0a000004 beq 8298
8284: e320f000 nop {0}
^^^^^^^^^^
8288: e3a03016 mov r3, #22
828c: e5803000 str r3, [r0]
8290: e3e00000 mvn r0, #0
This in turn is due to a fixup in ARM ld which transforms branch-to-null
into a nop. It is better than crashing but still wrong since errno
handling is removed.
With the patch, errno_location is restored back in test program.
00008274 <__GI_mmap>:
8274: e92d40b0 push {r4, r5, r7, lr}
8278: e59d5014 ldr r5, [sp, #20]
827c: e1b0ca05 lsls ip, r5, #20
8280: 0a000004 beq 8298 <__GI_mmap+0x24>
8284: eb000010 bl 82cc <__errno_location>
8288: e3a03016 mov r3, #22
828c: e5803000 str r3, [r0]
Cc: Christian Ruppert <christian.ruppert@abilis.com>
CC: Francois Bedard <Francois.Bedard@synopsys.com>
Cc: Anton Kolesov <Anton.Kolesov@synopsys.com>
Cc: Joern Rennecke <joern.rennecke@embecosm.com>
Cc: Jeremy Bennett <jeremy.bennett@embecosm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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WHY: errno in uClibc is not thread safe
HOW: __errno_location and it's sibling __h_errno_location need to be called
via PLT - even from within libc. That way when linked with pthread,
intra-uClibc callers will also use the thread safe version.
This is achieved by removing the GI alias for these functions,
ensuring that they get called normally (via PLT)
Verified with ARC LT.old and ARM cubieboard2 buildroot (LT.old)
NPTL is unaffected by this bug.
------------ History behind this patch ---------------------
This is a long standing bug (https://bugs.busybox.net/show_bug.cgi?id=2089)
Others have tried to fix it in past (alteast Peter Korsgaard's patch in 2010),
but somehow failed to be merged (or were backed out afterwards).
http://lists.uclibc.org/pipermail/uclibc/2010-July/044176.html
One of the causes could be side effect of atleast one more bug related to
pthreads and static link which has now been fixed.
http://lists.uclibc.org/pipermail/uclibc/2013-October/047958.html
I have solved this w/o looking at other pacthes but would like to give
credit to Peter and others for confirming that it makes sense.
Cc: Christian Ruppert <christian.ruppert@abilis.com>
CC: Francois Bedard <Francois.Bedard@synopsys.com>
Cc: Joern Rennecke <joern.rennecke@embecosm.com>
Cc: Jeremy Bennett <jeremy.bennett@embecosm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: buildroot@busybox.net
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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A simple statically linked hello world program was segfaulting for ARC
in linuxthreads.old configuration (although the root casue applies
cross-arch for NPTL as well as linuxthreads.old as described)
The crash was due to branch to NULL in _stdio_init
0001026c <_stdio_init>:
1026c: push_s blink
1026e: st.a r13,[sp,-8]
10272: bl.d 0 --> supposed call to __errno_location
The call was NOT getting patched to libc internal only alias
__GI___errno_location, because it was weak while it's exported cousin,
__errno_location was strong/normal.
arc-linux-uclibc-nm libc/misc/internals/__errno_location.os
00000000 W __GI___errno_location
00000000 T __errno_location
This is exactly opposite to what is expected.
Quoting Peter S. Mazinger, commit 87936cd013041 "errno and *_init cleanup"
| The rule adopted:
| for enabled threads we make in libc the __GI_x() variants strong, x() weak
| and (should) provide another strong x() in libpthread.
| If threads are disabled, even the __GI_x() variants are weak.
With the fix, we see the right settings as below
00000000 T __GI___errno_location
00000000 W __errno_location
Note that problem won't show up in a static busybox build as it references
errno and that seems to elide the issue.
I can confirm the same/more issues with latest ARM buildroot builds w/o
my fix.
(1). linuxthreads.old (broken just like ARC)
arm-linux-nm uclibc-snapshot/libc/misc/internals/__errno_location.os
00000000 W __GI___errno_location
00000000 T __errno_location
But presumably the issue there is NOT catestrophic because ARM linker is
likely smarter and patches a NOP instead of NULL branch.
00008388 <_stdio_init>:
8388: e92d4038 push {r3, r4, r5, lr}
838c: e320f000 nop {0}
(2) NPTL build (exported version is not weak)
00000000 T __GI___errno_location
00000000 T __errno_location
This causes a static link with libpthread and test program
referencing errno to fail to link.
#include <errno.h>
int main(void)
{
printf("%d\n", errno);
}
arm-linux-gcc -static -pthread -o tst tst.o
arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libc.a(__errno_location.os):
In function `__errno_location': __errno_location.c:(.text+0x0):
multiple definition of `__errno_location'
arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libpthread.a
(errno_location.os):errno_location.c:(.text+0x0): first defined here
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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It's not safe to use the aux vect inside __uClibc_main if we are running
with shared libraries, because it could have been already modified.
For example, if some constructor plays with environment variables by
using unsetenv, the modifications done into the stack to unset an
environment variable, have impacts on the aux vect due to the extra NULL
entries added.
Due to this, __uClibc_main is not able to detect where the aux vect
starts, so all the entries that are used by __uClibc_main (AT_UID,
AT_EUID, AT_GID, AT_EGID, AT_PAGESZ and possibly other arch specific)
are impacted.
Same side effect on the aux vect is caused by the ld.so when running a
SUID program with some of the unsecure environment variables set, that
will be unset by the ld.so itself.
In order to fix this issue, it needs to handle aux vect entries into
__uClibc_main only if SHARED is not defined.
In SHARED case, libc refers to __dl_secure and _dl_pagesize as initialised
by the ld.so where the aux vext is still untouched.
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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This matches a similar change made to glibc.
No functional changes here.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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test post-receive hook
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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independent options
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Move h_errno related stuff to separate file.
Do not hide errno and h_errno for non-TLS, else it keeps being 0.
Make __[h_]errno_location weak for non-TLS.
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Remove unneeded headers.
Guard inclusion of fcntl.h.
While there, remove an obsoleted comment.
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Define a common view of __errno_location, __h_errno_location in common header
and use that everywhere, __uClibc_main.c is no special.
The rule adopted:
for enabled threads we make in libc the __GI_x() variants strong, x() weak
and (should) provide another strong x() in libpthread.
If threads are disabled, even the __GI_x() variants are weak.
_stdio_init,_stdio_term,_locale_init: make all hidden weak in common header
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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The linker can cope with it if it is hidden.
No need for the __GI___uClibc_init.
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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No need for a visible version
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Handle _dl_skip_args in the asm part of the dynamic linker startup,
to skip the ldso arguments, so we can keep this symbol hidden as other archs do.
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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and shuffle tokens memsetting around.
No obj-code changes.
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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fix signed vs. unsigned comparison warnings while at it
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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* origin/master: (137 commits)
utils/ldd: Check for returned pointer from strrchr not the value it holds
cris: add provide arch-specific vfork implementation
lutimes.c, stubs.c: fix compiling lutimes, if __NR_utimensat is not defined
bump version to 0.9.32-rc3-git
release 0.9.32-rc3
memalign: include sys/param.h for MAX
arm/bits/atomic.h: Include common/bit/atomic.h for thumb1
wctype.h: fix libc_hidden_proto for iswupper and add it for iswspace
add libc_hidden_proto for wcs[n]casecmp_l
really fix missing __libc_drand48_data
Revert "missing prototype of __libc_drand48_data fixed"
missing prototype of __libc_drand48_data fixed
time.c, time.h: remove unused hidden strftime/strptime
nanosleep.c: remove duplicated libc_hidden_proto
ctype.c, ctype.h: remove commented parts that were banned for removal after 0.9.31
_wctype.c, wctype.h: remove unused isw* and wctype_l hidden functions
time.c, wchar.h: remove unused hidden wcsftime
str[n]casecmp.c: fix hidden usage
remove unused hidden functions
frv/memset.S: add missing libc_hidden_def
...
Conflicts:
ldso/ldso/ldso.c
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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Avoid using strong_alias in ssp, some archs dislike it.
Make stack_chk_guard static.
Export __stack_smash_handler only if compatibility option is enabled.
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
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Add some missing prototypes
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
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The printf precision takes an integer, not a size_t. Otherwise we get:
libc/misc/internals/tempname.c: In function '___path_search':
libc/misc/internals/tempname.c:116: warning:
field precision should have type 'int', but argument 3 has type 'size_t'
field precision should have type 'int', but argument 5 has type 'size_t'
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Conflicts:
ldso/include/dl-hash.h
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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If line is longer then size of given buffer and buffer is not allocated by
the config parser itself, then discard rest of line.
Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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We must always initialize line pointer since data pointer might
have changed due to a realloc (in getserv.c for example).
Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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We need to update the parser->line pointer on realloc and do not
initialize the token array til after the potensial realloc in
bb_get_chunk_with_continuation().
While here, also replace a realloc() with malloc() where pointer always
is NULL.
Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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The dynamic linker can be run either indirectly through running some
dynamically linked program or library (in which case no command line options
to the dynamic linker can be passed and, in the ELF case, the dynamic linker
which is stored in the .interp section of the program is executed)
or directly by running:
/lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
Stand-alone execution is a prerequisite for adding prelink capabilities
to uClibc dynamic linker, as well useful for testing an updated version
of the dynamic linker without breaking the whole system.
Currently supported option:
--library-path PATH use given PATH instead of content of the environment
variable LD_LIBRARY_PATH
(Mandatory for prelinking)
Not supported options:
--list list all dependencies and how they are resolved
--verify verify that given object really is a dynamically linked
object we can handle
--inhibit-rpath LIST ignore RUNPATH and RPATH information in object names
in LIST
This feature can be enabled by setting LDSO_STANDALONE_SUPPORT=y
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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