From bd6060a1c661b37b3f39a8b92ddea8725ae34fb1 Mon Sep 17 00:00:00 2001 From: Konstantin Belousov Date: Sat, 29 Aug 2015 14:25:01 +0000 Subject: Switch libc from using _sig{procmask,action,suspend} symbols, which are aliases for the syscall stubs and are plt-interposed, to the libc-private aliases of internally interposed sigprocmask() etc. Since e.g. _sigaction is not interposed by libthr, calling signal() removes thr_sighandler() from the handler slot etc. The result was breaking signal semantic and rtld locking. The added __libc_sigprocmask and other symbols are hidden, they are not exported and cannot be called through PLT. The setjmp/longjmp functions for x86 were changed to use direct calls, and since PIC_PROLOGUE only needed for functional PLT indirection on i386, it is removed as well. The PowerPC bug of calling the syscall directly in the setjmp/longjmp implementation is kept as is. Reported by: Pete French Tested by: Michiel Boland Reviewed by: jilles (previous version) Sponsored by: The FreeBSD Foundation MFC after: 1 week --- lib/libc/include/libc_private.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'lib/libc/include') diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h index a670d63e0854..5caf9a362550 100644 --- a/lib/libc/include/libc_private.h +++ b/lib/libc/include/libc_private.h @@ -359,6 +359,11 @@ __pid_t __sys_wait6(enum idtype, __id_t, int *, int, __ssize_t __sys_write(int, const void *, __size_t); __ssize_t __sys_writev(int, const struct iovec *, int); +int __libc_sigaction(int, const struct sigaction *, + struct sigaction *) __hidden; +int __libc_sigprocmask(int, const __sigset_t *, __sigset_t *) + __hidden; +int __libc_sigsuspend(const __sigset_t *) __hidden; int __libc_sigwait(const __sigset_t * __restrict, int * restrict sig); int __libc_system(const char *); -- cgit v1.3