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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2016-12-31 23:32:17 +0530 |
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| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2016-12-31 23:49:24 +0530 |
| commit | 67e58f39412ecd4467034761f3f074283c90f3c8 (patch) | |
| tree | 1498c4ac17e0606ba3f38ac59296793fb0cc1dd5 /elf/dl-support.c | |
| parent | bbe989ee87ee81f45a4f6450bff468f7a193e79e (diff) | |
| download | glibc-67e58f39412ecd4467034761f3f074283c90f3c8.tar.gz glibc-67e58f39412ecd4467034761f3f074283c90f3c8.tar.xz glibc-67e58f39412ecd4467034761f3f074283c90f3c8.zip | |
Add framework for tunables
The tunables framework allows us to uniformly manage and expose global variables inside glibc as switches to users. tunables/README has instructions for glibc developers to add new tunables. Tunables support can be enabled by passing the --enable-tunables configure flag to the configure script. This patch only adds a framework and does not pose any limitations on how tunable values are read from the user. It also adds environment variables used in malloc behaviour tweaking to the tunables framework as a PoC of the compatibility interface. * manual/install.texi: Add --enable-tunables option. * INSTALL: Regenerate. * README.tunables: New file. * Makeconfig (CPPFLAGS): Define TOP_NAMESPACE. (before-compile): Generate dl-tunable-list.h early. * config.h.in: Add HAVE_TUNABLES. * config.make.in: Add have-tunables. * configure.ac: Add --enable-tunables option. * configure: Regenerate. * csu/init-first.c (__libc_init_first): Move __libc_init_secure earlier... * csu/init-first.c (LIBC_START_MAIN):... to here. Include dl-tunables.h, libc-internal.h. (LIBC_START_MAIN) [!SHARED]: Initialize tunables for static binaries. * elf/Makefile (dl-routines): Add dl-tunables. * elf/Versions (ld): Add __tunable_set_val to GLIBC_PRIVATE namespace. * elf/dl-support (_dl_nondynamic_init): Unset MALLOC_CHECK_ only when !HAVE_TUNABLES. * elf/rtld.c (process_envvars): Likewise. * elf/dl-sysdep.c [HAVE_TUNABLES]: Include dl-tunables.h (_dl_sysdep_start): Call __tunables_init. * elf/dl-tunable-types.h: New file. * elf/dl-tunables.c: New file. * elf/dl-tunables.h: New file. * elf/dl-tunables.list: New file. * malloc/tst-malloc-usable-static.c: New test case. * malloc/Makefile (tests-static): Add it. * malloc/arena.c [HAVE_TUNABLES]: Include dl-tunables.h. Define TUNABLE_NAMESPACE. (DL_TUNABLE_CALLBACK (set_mallopt_check)): New function. (DL_TUNABLE_CALLBACK_FNDECL): New macro. Use it to define callback functions. (ptmalloc_init): Set tunable values. * scripts/gen-tunables.awk: New file. * sysdeps/mach/hurd/dl-sysdep.c: Include dl-tunables.h. (_dl_sysdep_start): Call __tunables_init.
Diffstat (limited to 'elf/dl-support.c')
| -rw-r--r-- | elf/dl-support.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index c30194c7b7..d350d6d0d0 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -354,8 +354,10 @@ _dl_non_dynamic_init (void) cp = (const char *) __rawmemchr (cp, '\0') + 1; } +#if !HAVE_TUNABLES if (__access ("/etc/suid-debug", F_OK) != 0) __unsetenv ("MALLOC_CHECK_"); +#endif } #ifdef DL_PLATFORM_INIT |