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static-pie: Skip the empty PT_LOAD segment at offset 0 [BZ #32763]

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As shown in

https://sourceware.org/bugzilla/show_bug.cgi?id=25237

linker may generate an empty PT_LOAD segments at offset 0:

Elf file type is EXEC (Executable file)
Entry point 0x4000e8
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000400000 0x0000000000400000
                 0x00000000000000f0 0x00000000000000f0  R E    0x1000
  LOAD           0x0000000000000000 0x0000000000410000 0x0000000000410000
                 0x0000000000000000 0x0000000000b5dce8  RW     0x10000
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text
   01     .bss
   02

Skip the empty PT_LOAD segment at offset 0 to support such binaries.
This fixes BZ #32763.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
H.J. Lu 2025-03-05 10:19:59 +08:00
parent 50351e0570
commit 596130591a
4 changed files with 56 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
elf/Makefile
View file

@ -1137,12 +1137,14 @@ tests += \
tst-dlopen-pie \
tst-dlopen-self-pie \
tst-dlopen-tlsmodid-pie \
tst-pie-bss \
tst-pie1 \
tst-pie2 \
# tests
tests-pie += \
tst-dlopen-self-pie \
tst-dlopen-tlsmodid-pie \
tst-pie-bss \
tst-pie1 \
tst-pie2 \
# tests-pie
@ -1157,9 +1159,11 @@ LDFLAGS-tst-pie-address += $(load-address-ldflag)=$(pde-load-address)
ifeq (yes,$(enable-static-pie))
tests += \
tst-pie-address-static \
tst-pie-bss-static \
# tests
tests-static += \
tst-pie-address-static \
tst-pie-bss-static \
# tests-static
LDFLAGS-tst-pie-address-static += \
$(load-address-ldflag)=$(pde-load-address)
@ -2082,6 +2086,7 @@ $(objpfx)tst-array5-static-cmp.out: tst-array5-static.exp \
CFLAGS-tst-pie1.c += $(pie-ccflag)
CFLAGS-tst-pie2.c += $(pie-ccflag)
CFLAGS-tst-pie-bss.c += $(pie-ccflag)
CFLAGS-tst-pie-address.c += $(pie-ccflag)
$(objpfx)tst-piemod1.so: $(libsupport)

3
elf/dl-reloc-static-pie.c
View file

@ -51,7 +51,8 @@ _dl_relocate_static_pie (void)
switch (ph->p_type)
{
case PT_LOAD:
if (ph->p_offset == 0)
/* Skip the empty PT_LOAD segment at offset 0. */
if (ph->p_filesz != 0 && ph->p_offset == 0)
file_p_vaddr = ph->p_vaddr;
break;
case PT_DYNAMIC:

19
elf/tst-pie-bss-static.c Normal file
View file

@ -0,0 +1,19 @@
/* Test static PIE with an empty PT_LOAD segment at offset 0.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-pie-bss.c"

30
elf/tst-pie-bss.c Normal file
View file

@ -0,0 +1,30 @@
/* Test PIE with an empty PT_LOAD segment at offset 0.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
char bss[0xb5dce8] __attribute__ ((aligned (65536)));
static int
do_test (void)
{
printf ("Hello\n");
return 0;
}
#include <support/test-driver.c>