commit 5891abdc66aa9578395bc8b8e5740f629a2694b7
author Elliott Hughes <enh@google.com> Fri Aug 07 18:27:47 2015 -0700
committer Elliott Hughes <enh@google.com> Fri Aug 07 19:44:12 2015 -0700
tree 7ce00a1c6da021bf09535dd0d287e76c9efd31fa
parent e80369ab0c484a99925a49a81ab0675538fab38a

Invalidate cached pid in vfork.

Bug: http://b/23008979
Change-Id: I1dd900ac988cdbe10aad3abc53240c5d352891d5

libc/arch-arm64/bionic/vfork.S

diff --git a/libc/arch-arm64/bionic/vfork.S b/libc/arch-arm64/bionic/vfork.S
index b6a672d..92fa333 100644
--- a/libc/arch-arm64/bionic/vfork.S
+++ b/libc/arch-arm64/bionic/vfork.S
@@ -31,6 +31,11 @@
 #include <linux/sched.h>
 
 ENTRY(vfork)
+    // __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
+    mrs     x0, tpidr_el0
+    ldr     x0, [x0, #8]
+    str     wzr, [x0, #20]
+
     mov     x0, #(CLONE_VM | CLONE_VFORK | SIGCHLD)
     mov     x1, xzr
     mov     x2, xzr