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From: Harald Hoyer <harald@redhat.com>
To: musl@lists.openwall.com
Subject: Re: [musl] [PATCH] Enable linking to a static position independent executable
Date: Thu, 23 Apr 2020 13:59:20 +0200	[thread overview]
Message-ID: <90b5cc62-a3b5-7808-5a81-fcb43d647df3@redhat.com> (raw)
In-Reply-To: <20200407131707.1220892-1-harald@redhat.com>

Hello,

currently this patch version is in Fedora's musl-gcc rpm and seems to work just fine.

Any more changes needed? Any concerns?

Do I need to do additional tasks to submit that as a PR?

Stay healthy!

Harald


Am 07.04.20 um 15:17 schrieb harald@redhat.com:
> From: Harald Hoyer <harald@redhat.com>
> 
> 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     .note.gnu.build-id .gnu.hash .dynsym .dynstr .rela.dyn
>    01     .init .plt .text .fini
>    02     .rodata .eh_frame_hdr .eh_frame
>    03     .init_array .fini_array .data.rel.ro .dynamic .got .got.plt .data .bss
>    04     .dynamic
>    05     .note.gnu.build-id
>    06     .eh_frame_hdr
>    07
>    08     .init_array .fini_array .data.rel.ro .dynamic .got
> ---
>  tools/musl-gcc.specs.sh | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>  mode change 100644 => 100755 tools/musl-gcc.specs.sh
> 
> diff --git a/tools/musl-gcc.specs.sh b/tools/musl-gcc.specs.sh
> old mode 100644
> new mode 100755
> index 30492574..4d93626a
> --- a/tools/musl-gcc.specs.sh
> +++ b/tools/musl-gcc.specs.sh
> @@ -17,13 +17,13 @@ cat <<EOF
>  libgcc.a%s %:if-exists(libgcc_eh.a%s)
>  
>  *startfile:
> -%{!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}
>  
>  *endfile:
> -crtendS.o%s $libdir/crtn.o
> +%{static:crtend.o%s; shared|static-pie|pie:crtendS.o%s; :crtend.o%s} $libdir/crtn.o%s
>  
>  *link:
> --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}}
>  
>  *esp_link:
>  
> 


  reply	other threads:[~2020-04-23 11:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-06 18:07 [musl] [PATCH] V2 " harald
2020-04-06 22:04 ` Fangrui Song
2020-04-07  8:42   ` Szabolcs Nagy
2020-04-07 13:17   ` [musl] [PATCH] " harald
2020-04-23 11:59     ` Harald Hoyer [this message]
2020-04-24 15:08     ` Rich Felker
2020-04-27 12:24       ` Harald Hoyer
2020-04-27 12:32         ` harald
2020-05-08  9:05           ` Harald Hoyer
2020-08-25 10:52           ` Harald Hoyer
  -- strict thread matches above, loose matches on Subject: below --
2020-04-06 17:58 harald
2020-04-06 18:35 ` Harald Hoyer

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