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* elf: Rework exception handling in the dynamic loader [BZ #25486]Florian Weimer2022-11-031-5/+0
| | | | | | | | | | | | | | | | | | | | | | | The old exception handling implementation used function interposition to replace the dynamic loader implementation (no TLS support) with the libc implementation (TLS support). This results in problems if the link order between the dynamic loader and libc is reversed (bug 25486). The new implementation moves the entire implementation of the exception handling functions back into the dynamic loader, using THREAD_GETMEM and THREAD_SETMEM for thread-local data support. These depends on Hurd support for these macros, added in commit b65a82e4e757c1e6cb7073916 ("hurd: Add THREAD_GET/SETMEM/_NC"). One small obstacle is that the exception handling facilities are used before the TCB has been set up, so a check is needed if the TCB is available. If not, a regular global variable is used to store the exception handling information. Also rename dl-error.c to dl-catch.c, to avoid confusion with the dlerror function. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Fix build a chec failures after b05fae4d8e34Adhemerval Zanella2021-11-091-1/+0
| | | | | | | | | | The include cleanup on dl-minimal.c removed too much for some targets. Also for Hurd, __sbrk is removed from localplt.data now that tunables allocated memory through mmap. Checked with a build for all affected architectures.
* mtrace: Wean away from malloc hooksSiddhesh Poyarekar2021-07-221-1/+0
| | | | | | | | | | | | | Wean mtrace away from the malloc hooks and move them into the debug DSO. Split the API away from the implementation so that we can add the API to libc.so as well as libc_malloc_debug.so, with the libc implementations being empty. Update localplt data since memalign no longer has any callers after this change. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* hurd: Move {,f,l}xstat{,at} and xmknod{at} to compat symbolsSamuel Thibault2020-11-111-2/+2
| | | | | | We do not actually need them, so we can move their implementations into the standard {,f,l}stat{,at} variants and only keep compatibility wrappers.
* hurd: keep only required PLTs in ld.soSamuel Thibault2020-11-111-14/+1
| | | | | | | | | | | | | | | | | | | | | We need NO_RTLD_HIDDEN because of the need for PLT calls in ld.so. See Roland's comment in https://sourceware.org/bugzilla/show_bug.cgi?id=15605 "in the Hurd it's crucial that calls like __mmap be the libc ones instead of the rtld-local ones after the bootstrap phase, when the dynamic linker is being used for dlopen and the like." We used to just avoid all hidden use in the rtld ; this commit switches to keeping only those that should use PLT calls, i.e. essentially those defined in sysdeps/mach/hurd/dl-sysdep.c: __assert_fail __assert_perror_fail __*stat64 _exit This fixes a few startup issues, notably the call to __tunable_get_val that is made before PLTs are set up.
* hurd: make close a cancellation pointSamuel Thibault2020-06-281-1/+2
| | | | | | | | | | | | | | and add _nocancel variant. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add close_nocancel. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE, ld.GLIBC_PRIVATE): Add __close_nocancel. * sysdeps/mach/hurd/i386/localplt.data (__close_nocancel): Allow PLT. * sysdeps/mach/hurd/close.c: Include <sysdep-cancel.h> (__libc_close): Surround _hurd_fd_close with enabling async cancel. * sysdeps/mach/hurd/close_nocancel.c: New file. * sysdeps/mach/hurd/not-cancel.h (__close_nocancel): Replace macro with declaration with hidden proto.
* hurd: make open and openat cancellation pointsSamuel Thibault2020-06-281-1/+2
| | | | | | | | | | | | | | | | | | | | | and add _nocancel variants. * sysdeps/mach/hurd/Makefile [io] (sysdep_routines): Add open_nocancel openat_nocancel. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE, ld.GLIBC_PRIVATE): Add __open_nocancel. * sysdeps/mach/hurd/dl-sysdep.c (__open_nocancel): Add alias, check it is not hidden. * sysdeps/mach/hurd/i386/localplt.data (__open_nocancel): Allow PLT. * sysdeps/mach/hurd/not-cancel.h (__open_nocancel, __openat_nocancel: Replace macros with declarations with hidden proto. (__open64_nocancel, __openat64_nocancel): Call __open_nocancel and __openat_nocancel instead of __open64 and __openat64. * sysdeps/mach/hurd/open.c: Include <sysdep-cancel.h> (__libc_open): Surround __file_name_lookup with enabling async cancel. * sysdeps/mach/hurd/openat.c: Likewise. * sysdeps/mach/hurd/open_nocancel.c, sysdeps/mach/hurd/openat_nocancel.c: New files.
* hurd: Make write and pwrite64 cancellation pointsSamuel Thibault2020-06-141-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | and add _nocancel variants. * sysdeps/mach/hurd/write.c (__libc_write): Call __write_nocancel surrounded by enabling async cancel, to replace implementation moved to... * sysdeps/mach/hurd/write_nocancel.c (__write_nocancel): ... here. * sysdeps/mach/hurd/pwrite64.c (__libc_pwrite64): Call __pwrite64_nocancel surrounded by enabling async cancel, to replace implementation moved to... * sysdeps/mach/hurd/pwrite64_nocancel.c (__pwrite64_nocancel): ... here. * sysdeps/mach/hurd/Makefile (sysdep_routines): Add write_nocancel and pwrite64_nocancel. * sysdeps/mach/hurd/not-cancel.h (__write_nocancel, __pwrite64_nocancel): Replace macros with prototypes with a hidden proto on libc. * sysdeps/mach/hurd/dl-sysdep.c (__write_nocancel): New alias, check that it is not hidden. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE): Add __write_nocancel. (ld.GLIBC_PRIVATE): Add __write_nocancel. * sysdeps/mach/hurd/i386/localplt.data (__write_nocancel): Add reference.
* hurd: Make read and pread64 cancellableSamuel Thibault2020-06-071-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | and add _nocancel variants. * sysdeps/mach/hurd/pread64.c (__libc_pread64): Call __pread64_nocancel surrounded by enabling async cancel, to replace implementation moved to... * sysdeps/mach/hurd/pread64_nocancel.c (__pread64_nocancel): ... here. * sysdeps/mach/hurd/read.c (__libc_read): Call __read_nocancel surrounded by enabling async cancel, to replace implementation moved to... * sysdeps/mach/hurd/read_nocancel.c (__read_nocancel): ... here. * sysdeps/mach/hurd/Makefile (sysdep_routines): Add read_nocancel and pread64_nocancel. * sysdeps/mach/hurd/not-cancel.h (__read_nocancel, __pread64_nocancel): Replace macros with prototypes with a hidden proto on libc. * sysdeps/mach/hurd/dl-sysdep.c: Include <not-cancel.h>. (__pread64_nocancel): New alias, check that it is not hidden. (__read_nocancel): New alias, check that it is not hidden. * sysdeps/mach/hurd/Versions (libc.GLIBC_PRIVATE): Add __read_nocancel and __pread64_nocancel. (ld.GLIBC_2.1): Add __pread64. (ld.GLIBC_PRIVATE): Add __read_nocancel and __pread64_nocancel. * sysdeps/mach/hurd/i386/ld.abilist (__pread64): Add symbol. * sysdeps/mach/hurd/i386/localplt.data (__read_nocancel, __pread64, __pread64_nocancel): Add references.
* elf: Turn _dl_printf, _dl_error_printf, _dl_fatal_printf into functionsFlorian Weimer2020-05-251-0/+1
| | | | | | | | | | | | | | This change makes it easier to set a breakpoint on these calls. This also addresses the issue that including <ldsodefs.h> without <unistd.h> does not result usable _dl_*printf macros because of the use of the STD*_FILENO macros there. (The private symbol for _dl_fatal_printf will go away again once the exception handling implementation is unified between libc and ld.so.) Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486]Florian Weimer2020-02-151-6/+0
| | | | | | | | | | | | | | | | | | | Exporting functions and relying on symbol interposition from libc.so makes the choice of implementation dependent on DT_NEEDED order, which is not what some compiler drivers expect. This commit replaces one magic mechanism (symbol interposition) with another one (preprocessor-/compiler-based redirection). This makes the hand-over from the minimal malloc to the full malloc more explicit. Removing the ABI symbols is backwards-compatible because libc.so is always in scope, and the dynamic loader will find the malloc-related symbols there since commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so: Support moving versioned symbols between sonames [BZ #24741]"). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* hurd: Do not make sigprocmask available in ld.soFlorian Weimer2019-12-181-1/+0
| | | | | | | | | | | After commit f7649d5780aa4682393b9daedd653e4d9c12784c ("dlopen: Do not block signals"), the dynamic linker no longer uses sigprocmask, which means that it does not have to be made available explicitly on hurd. This reverts commit 892badc9bbcd4a6f8c2eb6c8a99be3aa22517532 ("hurd: Make __sigprocmask GLIBC_PRIVATE") and commit d5ed9ba29a3c818b3433a1784862494968abda45 ("hurd: Fix ld.so link"), but keeps the comment changes from the second commit.
* hurd: Fix ld.so __access override from libcSamuel Thibault2019-12-011-1/+1
| | | | | | ld.so symbols to be overriden by libc need to be extern to really get overriden. __access happens to have never been exposed, putting it to GLIBC_PRIVATE.
* hurd: Fix ld.so __getcwd override from libcSamuel Thibault2019-12-011-1/+1
| | | | | | ld.so symbols to be overriden by libc need to be extern to really get overriden. __getcwd happens to have never been exposed, putting it to GLIBC_PRIVATE.
* hurd: Fix ld.so linkSamuel Thibault2019-12-011-0/+1
| | | | | Since a2e8aa0d9ea6 ("Block signals during the initial part of dlopen") dl_open uses sigprocmask, so we need a stub implementation.
* hurd: Fix some ld.so symbol override from libcSamuel Thibault2018-07-281-1/+1
| | | | | | | | ld.so symbols to be overriden by libc need to be extern to really get overriden. * sysdeps/mach/hurd/not-errno.h: New file. * sysdeps/mach/hurd/i386/localplt.data: Update accordingly.
* hurd: Fix some ld.so symbol override from libcSamuel Thibault2018-07-281-4/+4
| | | | | | | | | | ld.so symbols to be overriden by libc need to be extern to really get overriden. * sysdeps/mach/hurd/dl-unistd.h (__access, __brk, __lseek, __read, __sbrk): Do not set attribute_hidden. * sysdeps/mach/hurd/i386/ld.abilist: Update accordingly. * sysdeps/mach/hurd/i386/localplt.data: Update accordingly.
* hurd: Fix some ld.so symbol override from libcSamuel Thibault2018-07-271-2/+2
| | | | | | | | | | | | | | ld.so symbols to be overriden by libc need to be extern to really get overriden. More fixes are needed to avoid the hidden attribute. * sysdeps/mach/hurd/Versions (libc): Make __access and __access_noerrno external so they can override the ld symbols. (ld): Make __access, __read, __sbrk, __strtoul_internal, __write, __writev, __open64, __access_noerrno extern so they can be overrided. * sysdeps/mach/hurd/i386/libc.abilist: Update accordingly. * sysdeps/mach/hurd/i386/ld.abilist: Update accordingly.
* hurd: fix localplt.data formatSamuel Thibault2018-06-191-1/+1
| | | | * sysdeps/mach/hurd/i386/localplt.data: Drop empty line.
* hurd: Fix "Missing required PLT reference"Samuel Thibault2018-06-191-0/+64
* sysdeps/mach/hurd/localplt.data: Move to... * sysdeps/mach/hurd/i386/localplt.data: new file. Add + REL R_386_GLOB_DAT like on Linux i386.
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