[Bug ld/21997] New: GNU_PROPERTY_NO_COPY_ON_PROTECTED is ignored by linker

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21997

            Bug ID: 21997
           Summary: GNU_PROPERTY_NO_COPY_ON_PROTECTED is ignored by linker
           Product: binutils
           Version: 2.30 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

When GNU_PROPERTY_NO_COPY_ON_PROTECTED is set on a shared object,
linker shouldn't generate copy relocation on protected symbol defined
in such shared object:

address@hidden protected-3]$ cat foo.c
 __attribute__ ((visibility ("protected")))
int protected = 1;

int
get_protected ()
{
  return protected;
}

int *
get_protected_p ()
{
  return &protected;
}
address@hidden protected-3]$ cat shared.S
        .section ".note.gnu.property", "a"
        .p2align 3
        .long 1f - 0f           /* name length.  */
        .long 3f - 2f           /* data length.  */
        /* NT_GNU_PROPERTY_TYPE_0 */
        .long 5                 /* note type.  */
0:      .asciz "GNU"            /* vendor name.  */
1:
        .p2align 3
2:
        /* GNU_PROPERTY_NO_COPY_ON_PROTECTED */
        .long 2                 /* pr_type.  */
        .long 0                 /* pr_datasz.  */
        .p2align 3
3:
address@hidden protected-3]$ cat main.c
#include <stdlib.h>

extern int protected;
extern int get_protected (void);
extern int* get_protected_p (void);

int main()
{

  if (protected != get_protected ())
    abort ();

  if (&protected != get_protected_p ())
    abort ();

  return 0;
}
address@hidden protected-3]$ make
gcc -B./  -O -c main.c
gcc -B./     -c -o shared.o shared.S
gcc -B./  -O -fPIE -c foo.c
./ld -shared  -o libfoo.so shared.o foo.o
gcc -B./   -o foo main.o libfoo.so -Wl,-rpath,.
for f in foo; do echo "Running: $f"; ./$f; \
  if [ $? != 0 ]; then echo Failed; fi; done
Running: foo
/bin/sh: line 1: 28249 Aborted                 ./$f
Failed
address@hidden protected-3]$

-- 
You are receiving this mail because:
You are on the CC list for the bug.