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nptl: Remove vfork IFUNC-based forwarder from libpthread [BZ #20188]

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With commit f0b2132b35 ("ld.so:
Support moving versioned symbols between sonames [BZ #24741]"), the
dynamic linker will find the definition of vfork in libc and binds
a vfork reference to that symbol, even if the soname in the version
reference says that the symbol should be located in libpthread.

As a result, the forwarder (whether it's IFUNC-based or a duplicate
of the libc implementation) is no longer necessary.

On older architectures, a placeholder symbol is required, to make sure
that the GLIBC_2.1.2 symbol version does not go away, or is turned in
to a weak symbol definition by the link editor.  (The symbol version
needs to preserved so that the symbol coverage check in
elf/dl-version.c does not fail for old binaries.)

mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the
baseline is GLIBC_2.0.  Since there are other @@GLIBC_2.2 symbols,
the placeholder symbol is not needed there.
This commit is contained in:
Florian Weimer
2019-07-02 15:12:20 +02:00
parent 27cec9aed9
commit 41d6f74e6c
40 changed files with 129 additions and 397 deletions
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1
sysdeps/unix/sysv/linux/sparc/pt-vfork.S
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/alpha/pt-vfork.S>

3
sysdeps/unix/sysv/linux/sparc/sparc32/libpthread.abilist
View File

@ -114,7 +114,6 @@ GLIBC_2.0 siglongjmp F
GLIBC_2.0 sigwait F
GLIBC_2.0 system F
GLIBC_2.0 tcdrain F
GLIBC_2.0 vfork F
GLIBC_2.0 wait F
GLIBC_2.0 waitpid F
GLIBC_2.0 write F
@ -155,7 +154,7 @@ GLIBC_2.1 sem_wait F
GLIBC_2.1.1 sem_close F
GLIBC_2.1.1 sem_open F
GLIBC_2.1.1 sem_unlink F
GLIBC_2.1.2 __vfork F
GLIBC_2.1.2 __libpthread_version_placeholder F
GLIBC_2.11 pthread_sigqueue F
GLIBC_2.12 pthread_getname_np F
GLIBC_2.12 pthread_mutex_consistent F

2
sysdeps/unix/sysv/linux/sparc/sparc64/libpthread.abilist
View File

@ -46,7 +46,6 @@ GLIBC_2.2 __read F
GLIBC_2.2 __res_state F
GLIBC_2.2 __send F
GLIBC_2.2 __sigaction F
GLIBC_2.2 __vfork F
GLIBC_2.2 __wait F
GLIBC_2.2 __write F
GLIBC_2.2 _pthread_cleanup_pop F
@ -192,7 +191,6 @@ GLIBC_2.2 siglongjmp F
GLIBC_2.2 sigwait F
GLIBC_2.2 system F
GLIBC_2.2 tcdrain F
GLIBC_2.2 vfork F
GLIBC_2.2 wait F
GLIBC_2.2 waitpid F
GLIBC_2.2 write F