GNU C Library master sources branch gentoo/2.23 updated. glibc-2.23-65-g7331d98

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=7331d984691b31a1c43bae54f4596a37fd9e7dcb

commit 7331d984691b31a1c43bae54f4596a37fd9e7dcb
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 1 07:14:42 2016 +0200

    fork in libpthread cannot use IFUNC resolver [BZ #19861]
    
    This commit only addresses the fork case, the vfork case has to be a
    tail call, which is why the generic code needs an IFUNC resolver
    there.
    
    (cherry picked from commit f06f3f05b48c72e2c9b0fa78671f94fd22d67da8)
    (cherry picked from commit 1915d6d182a55d1eb852643a78ac24bc17783fb0)

diff --git a/nptl/pt-fork.c b/nptl/pt-fork.c
index b65d6b4..db9b61d 100644
--- a/nptl/pt-fork.c
+++ b/nptl/pt-fork.c
@@ -25,33 +25,14 @@
    the historical ABI requires it.  For static linking, there is no need to
    provide anything here--the libc version will be linked in.  For shared
    library ABI compatibility, there must be __fork and fork symbols in
-   libpthread.so; so we define them using IFUNC to redirect to the libc
-   function.  */
+   libpthread.so.
 
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
-
-# if HAVE_IFUNC
-
-static __typeof (fork) *
-__attribute__ ((used))
-fork_resolve (void)
-{
-  return &__libc_fork;
-}
+   With an IFUNC resolver, it would be possible to avoid the
+   indirection, but the IFUNC resolver might run before the
+   __libc_fork symbol has been relocated, in which case the IFUNC
+   resolver would not be able to provide the correct address.  */
 
-#  ifdef HAVE_ASM_SET_DIRECTIVE
-#   define DEFINE_FORK(name) \
-  asm (".set " #name ", fork_resolve\n" \
-       ".globl " #name "\n" \
-       ".type " #name ", %gnu_indirect_function");
-#  else
-#   define DEFINE_FORK(name) \
-  asm (#name " = fork_resolve\n" \
-       ".globl " #name "\n" \
-       ".type " #name ", %gnu_indirect_function");
-#  endif
-
-# else  /* !HAVE_IFUNC */
+#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
 
 static pid_t __attribute__ ((used))
 fork_compat (void)
@@ -59,14 +40,10 @@ fork_compat (void)
   return __libc_fork ();
 }
 
-# define DEFINE_FORK(name) strong_alias (fork_compat, name)
-
-# endif  /* HAVE_IFUNC */
-
-DEFINE_FORK (fork_ifunc)
-compat_symbol (libpthread, fork_ifunc, fork, GLIBC_2_0);
+strong_alias (fork_compat, fork_alias)
+compat_symbol (libpthread, fork_alias, fork, GLIBC_2_0);
 
-DEFINE_FORK (__fork_ifunc)
-compat_symbol (libpthread, __fork_ifunc, __fork, GLIBC_2_0);
+strong_alias (fork_compat, __fork_alias)
+compat_symbol (libpthread, __fork_alias, __fork, GLIBC_2_0);
 
 #endif

-----------------------------------------------------------------------

Summary of changes:
 nptl/pt-fork.c |   43 ++++++++++---------------------------------
 1 files changed, 10 insertions(+), 33 deletions(-)


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