diff mbox series

[uclibc-ng-devel] Fix TLS allocation and loading in !SHARED case

Message ID 20190411102157.7522-1-ysionneau@kalray.eu
State Accepted
Headers show
Series [uclibc-ng-devel] Fix TLS allocation and loading in !SHARED case | expand

Commit Message

Yann Sionneau April 11, 2019, 10:21 a.m. UTC
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>
 libc/misc/internals/__uClibc_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/libc/misc/internals/__uClibc_main.c b/libc/misc/internals/__uClibc_main.c
index 849bca8..affa0ce 100644
--- a/libc/misc/internals/__uClibc_main.c
+++ b/libc/misc/internals/__uClibc_main.c
@@ -370,7 +370,7 @@  void __uClibc_main(int (*main)(int, char **, char **), int argc,
 		    char **argv, void (*app_init)(void), void (*app_fini)(void),
 		    void (*rtld_fini)(void), void *stack_end attribute_unused)
-#if !defined __ARCH_HAS_NO_LDSO__ && !defined SHARED
+#ifndef SHARED
     unsigned long *aux_dat;
     ElfW(auxv_t) auxvt[AT_EGID + 1];
@@ -396,7 +396,7 @@  void __uClibc_main(int (*main)(int, char **, char **), int argc,
 	__environ = &argv[argc];
-#if !defined __ARCH_HAS_NO_LDSO__ && !defined SHARED
+#ifndef SHARED
     /* Pull stuff from the ELF header when possible */
     memset(auxvt, 0x00, sizeof(auxvt));
     aux_dat = (unsigned long*)__environ;