Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Tue,  7 Apr 2020 15:17:07 +0200
Cc: Harald Hoyer <>
Subject: [PATCH] Enable linking to a static position independent executable

From: Harald Hoyer <>

This also enables address space layout randomization (ASLR).

$ cat hello.c

int main()
  printf("main = 0x%lxd\n", main);
  return 0;

$ gcc -static-pie -o hello hello.c -specs musl-gcc.specs

$ ldd hello
	statically linked

$ file hello
hello: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=24fe0d02b0558dc37b8ae2268878b118804ae72d, with debug_info, not stripped

$ ./hello
main = 0x7f858c4e72b9d

$ ./hello
main = 0x7f0854d312b9d

$ ./hello
main = 0x7f7179a1d2b9d

$ ./hello
main = 0x7f37f981b2b9d

$ readelf -l hello

Elf file type is DYN (Shared object file)
Entry point 0x1058
There are 9 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x00000000000003c0 0x00000000000003c0  R      0x1000
  LOAD           0x0000000000001000 0x0000000000001000 0x0000000000001000
                 0x0000000000002cce 0x0000000000002cce  R E    0x1000
  LOAD           0x0000000000004000 0x0000000000004000 0x0000000000004000
                 0x0000000000001550 0x0000000000001550  R      0x1000
  LOAD           0x0000000000005e50 0x0000000000006e50 0x0000000000006e50
                 0x00000000000002e0 0x00000000000009a0  RW     0x1000
  DYNAMIC        0x0000000000005e70 0x0000000000006e70 0x0000000000006e70
                 0x0000000000000170 0x0000000000000170  RW     0x8
  NOTE           0x0000000000000238 0x0000000000000238 0x0000000000000238
                 0x0000000000000024 0x0000000000000024  R      0x4
  GNU_EH_FRAME   0x0000000000004b60 0x0000000000004b60 0x0000000000004b60
                 0x00000000000001ec 0x00000000000001ec  R      0x4
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x10
  GNU_RELRO      0x0000000000005e50 0x0000000000006e50 0x0000000000006e50
                 0x00000000000001b0 0x00000000000001b0  R      0x1

 Section to Segment mapping:
  Segment Sections...
   00 .gnu.hash .dynsym .dynstr .rela.dyn
   01     .init .plt .text .fini
   02     .rodata .eh_frame_hdr .eh_frame
   03     .init_array .fini_array .dynamic .got .got.plt .data .bss
   04     .dynamic
   06     .eh_frame_hdr
   08     .init_array .fini_array .dynamic .got
 tools/ | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
 mode change 100644 => 100755 tools/

diff --git a/tools/ b/tools/
old mode 100644
new mode 100755
index 30492574..4d93626a
--- a/tools/
+++ b/tools/
@@ -17,13 +17,13 @@ cat <<EOF
 libgcc.a%s %:if-exists(libgcc_eh.a%s)
-%{!shared: $libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
+%{shared:;static:$libdir/crt1.o%s; static-pie:$libdir/rcrt1.o%s; pie:$libdir/Scrt1.o%s; :$libdir/crt1.o%s} $libdir/crti.o%s %{static:crtbeginT.o%s; shared|static-pie|pie:crtbeginS.o%s; :crtbegin.o%s}
-crtendS.o%s $libdir/crtn.o
+%{static:crtend.o%s; shared|static-pie|pie:crtendS.o%s; :crtend.o%s} $libdir/crtn.o%s
--dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static} %{rdynamic:-export-dynamic}
+%{!r:--build-id} --no-add-needed %{!static|static-pie:--eh-frame-hdr} --hash-style=gnu %{shared:-shared} %{!shared:%{!static:%{!static-pie:%{rdynamic:-export-dynamic} -dynamic-linker $ldso}} %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}

Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.