[Bug libc/27902] New: The x86-64 clone wrapper fails to align child stack

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27902

            Bug ID: 27902
           Summary: The x86-64 clone wrapper fails to align child stack
           Product: glibc
           Version: 2.34
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
            Target: x86-64

This patch aligns the child stack:

diff --git a/sysdeps/unix/sysv/linux/x86_64/clone.S
b/sysdeps/unix/sysv/linux/x86_64/clone.S
index 31ac12da0c..5f52ce7813 100644
--- a/sysdeps/unix/sysv/linux/x86_64/clone.S
+++ b/sysdeps/unix/sysv/linux/x86_64/clone.S
@@ -57,6 +57,9 @@ ENTRY (__clone)
   testq %rsi,%rsi      /* no NULL stack pointers */
   jz SYSCALL_ERROR_LABEL

+  /* Align stack to 16 bytes per the x86-64 psABI.  */
+  andq  $-16, %rsi
+
   /* Insert the argument onto the new stack.  */
   subq  $16,%rsi
   movq  %rcx,8(%rsi)

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