100 lines
3.3 KiB
Diff
100 lines
3.3 KiB
Diff
From 0d79e34e6da9d9827cfb7c787e90524176248d67 Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Mon, 27 Apr 2020 14:32:07 +0200
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Bug-Debian: https://bugs.debian.org/996326
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Origin: https://www.openwall.com/lists/musl/2020/04/27/2
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Subject: [PATCH] Enable linking to a static position independent executable
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This also enables address space layout randomization (ASLR).
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$ cat hello.c
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int main()
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{
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printf("main = 0x%lxd\n", main);
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return 0;
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}
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$ gcc -fPIE -static-pie -o hello hello.c -specs musl-gcc.specs
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$ ldd hello
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statically linked
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$ file hello
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hello: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), statically linked, with debug_info, not stripped, too many notes (256)
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$ ./hello
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main = 0x7f858c4e72b9d
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$ ./hello
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main = 0x7f0854d312b9d
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$ ./hello
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main = 0x7f7179a1d2b9d
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$ ./hello
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main = 0x7f37f981b2b9d
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$ readelf -l hello
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Elf file type is DYN (Shared object file)
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Entry point 0x104f
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There are 7 program headers, starting at offset 64
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Program Headers:
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Type Offset VirtAddr PhysAddr
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FileSiz MemSiz Flags Align
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LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
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0x0000000000000308 0x0000000000000308 R 0x1000
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LOAD 0x0000000000001000 0x0000000000001000 0x0000000000001000
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0x0000000000003eb7 0x0000000000003eb7 R E 0x1000
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LOAD 0x0000000000005000 0x0000000000005000 0x0000000000005000
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0x000000000000136c 0x000000000000136c R 0x1000
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LOAD 0x0000000000006e50 0x0000000000007e50 0x0000000000007e50
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0x00000000000002e0 0x00000000000009a0 RW 0x1000
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DYNAMIC 0x0000000000006e70 0x0000000000007e70 0x0000000000007e70
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0x0000000000000180 0x0000000000000180 RW 0x8
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GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
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0x0000000000000000 0x0000000000000000 RW 0x10
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GNU_RELRO 0x0000000000006e50 0x0000000000007e50 0x0000000000007e50
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0x00000000000001b0 0x00000000000001b0 R 0x1
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Section to Segment mapping:
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Segment Sections...
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00 .hash .gnu.hash .dynsym .dynstr .rela.dyn
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01 .init .plt .text .fini
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02 .rodata .eh_frame
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03 .init_array .fini_array .data.rel.ro .dynamic .got .got.plt .data .bss
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04 .dynamic
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05
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06 .init_array .fini_array .data.rel.ro .dynamic .got
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---
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tools/musl-gcc.specs.sh | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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mode change 100644 => 100755 tools/musl-gcc.specs.sh
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diff --git a/tools/musl-gcc.specs.sh b/tools/musl-gcc.specs.sh
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old mode 100644
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new mode 100755
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index 30492574..ed584ed3
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--- a/tools/musl-gcc.specs.sh
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+++ b/tools/musl-gcc.specs.sh
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@@ -17,13 +17,13 @@ cat <<EOF
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libgcc.a%s %:if-exists(libgcc_eh.a%s)
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*startfile:
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-%{!shared: $libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
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+%{shared:;static-pie:$libdir/rcrt1.o; :$libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
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*endfile:
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crtendS.o%s $libdir/crtn.o
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*link:
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--dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static} %{rdynamic:-export-dynamic}
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+-dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static} %{static-pie:-static -pie --no-dynamic-linker} %{rdynamic:-export-dynamic}
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*esp_link:
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--
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2.26.2
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