diff options
Diffstat (limited to 'meta/recipes-core/glibc/glibc/0027-Acquire-ld.so-lock-before-switching-to-malloc_atfork.patch')
| -rw-r--r-- | meta/recipes-core/glibc/glibc/0027-Acquire-ld.so-lock-before-switching-to-malloc_atfork.patch | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/meta/recipes-core/glibc/glibc/0027-Acquire-ld.so-lock-before-switching-to-malloc_atfork.patch b/meta/recipes-core/glibc/glibc/0027-Acquire-ld.so-lock-before-switching-to-malloc_atfork.patch deleted file mode 100644 index 9ec234bd51..0000000000 --- a/meta/recipes-core/glibc/glibc/0027-Acquire-ld.so-lock-before-switching-to-malloc_atfork.patch +++ /dev/null @@ -1,70 +0,0 @@ -From 94225ab4bcc1613531558a632270b5edce779bc9 Mon Sep 17 00:00:00 2001 -From: Khem Raj <raj.khem@gmail.com> -Date: Sat, 27 Jan 2018 10:08:04 -0800 -Subject: [PATCH 27/27] Acquire ld.so lock before switching to malloc_atfork - -The patch is from - https://sourceware.org/bugzilla/show_bug.cgi?id=4578 - -If a thread happens to hold dl_load_lock and have r_state set to RT_ADD or -RT_DELETE at the time another thread calls fork(), then the child exit code -from fork (in nptl/sysdeps/unix/sysv/linux/fork.c in our case) re-initializes -dl_load_lock but does not restore r_state to RT_CONSISTENT. If the child -subsequently requires ld.so functionality before calling exec(), then the -assertion will fire. - -The patch acquires dl_load_lock on entry to fork() and releases it on exit -from the parent path. The child path is initialized as currently done. -This is essentially pthreads_atfork, but forced to be first because the -acquisition of dl_load_lock must happen before malloc_atfork is active -to avoid a deadlock. - -The patch has not yet been integrated upstream. - -Upstream-Status: Pending [ Not Author See bugzilla] - -Signed-off-by: Raghunath Lolur <Raghunath.Lolur@kpit.com> -Signed-off-by: Yuanjie Huang <yuanjie.huang@windriver.com> -Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com> -Signed-off-by: Khem Raj <raj.khem@gmail.com> ---- - sysdeps/nptl/fork.c | 9 +++++++++ - 1 file changed, 9 insertions(+) - -diff --git a/sysdeps/nptl/fork.c b/sysdeps/nptl/fork.c -index f87506f398..225e7b51f8 100644 ---- a/sysdeps/nptl/fork.c -+++ b/sysdeps/nptl/fork.c -@@ -25,6 +25,7 @@ - #include <tls.h> - #include <hp-timing.h> - #include <ldsodefs.h> -+#include <libc-lock.h> - #include <stdio-lock.h> - #include <atomic.h> - #include <nptl/pthreadP.h> -@@ -60,6 +61,10 @@ __libc_fork (void) - but our current fork implementation is not. */ - bool multiple_threads = THREAD_GETMEM (THREAD_SELF, header.multiple_threads); - -+ /* grab ld.so lock BEFORE switching to malloc_atfork */ -+ __rtld_lock_lock_recursive (GL(dl_load_lock)); -+ __rtld_lock_lock_recursive (GL(dl_load_write_lock)); -+ - /* Run all the registered preparation handlers. In reverse order. - While doing this we build up a list of all the entries. */ - struct fork_handler *runp; -@@ -246,6 +251,10 @@ __libc_fork (void) - - allp = allp->next; - } -+ -+ /* unlock ld.so last, because we locked it first */ -+ __rtld_lock_unlock_recursive (GL(dl_load_write_lock)); -+ __rtld_lock_unlock_recursive (GL(dl_load_lock)); - } - - return pid; --- -2.16.1 - |