From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: Re: Segmentation fault in static binaries built with recent binutils
Date: Wed, 18 Jul 2018 21:00:24 +0200 [thread overview]
Message-ID: <20180718190024.GL4418@port70.net> (raw)
In-Reply-To: <20180718181438.nl4e333zkzw36rzl@reiner-h.de>
* Reiner Herrmann <reiner@reiner-h.de> [2018-07-18 20:14:38 +0200]:
> > Can you attach a readelf -a of the binary that's crashing?
>
> The output is attached.
i could reproduce the crash in a debian:unstable docker image
i see incorrect auxv[AT_PHDR] value, not yet sure why.
Program received signal SIGSEGV, Segmentation fault.
static_init_tls (aux=aux@entry=0x7fffffffebc0) at ../src/env/__init_tls.c:88
88 if (phdr->p_type == PT_PHDR)
(gdb) disas
Dump of assembler code for function static_init_tls:
0x0000000000401404 <+0>: sub $0x8,%rsp
0x0000000000401408 <+4>: mov 0x18(%rdi),%r9
0x000000000040140c <+8>: mov 0x28(%rdi),%rsi
0x0000000000401410 <+12>: xor %ecx,%ecx
0x0000000000401412 <+14>: xor %eax,%eax
0x0000000000401414 <+16>: mov %r9,%rdx
0x0000000000401417 <+19>: test %rsi,%rsi
0x000000000040141a <+22>: je 0x401456 <static_init_tls+82>
=> 0x000000000040141c <+24>: mov (%rdx),%r8d
...
(gdb) p/x aux[3]
$4 = 0x400040
(gdb) i proc map
process 13499
Mapped address spaces:
Start Addr End Addr Size Offset objfile
0x401000 0x402000 0x1000 0x1000 /musl/build/a.out
0x402000 0x403000 0x1000 0x2000 /musl/build/a.out
0x403000 0x405000 0x2000 0x2000 /musl/build/a.out
0x7ffff7ffa000 0x7ffff7ffd000 0x3000 0x0 [vvar]
0x7ffff7ffd000 0x7ffff7fff000 0x2000 0x0 [vdso]
0x7ffffffde000 0x7ffffffff000 0x21000 0x0 [stack]
(gdb) i reg
rax 0x0 0
rbx 0x0 0
rcx 0x0 0
rdx 0x400040 4194368
rsi 0x5 5
rdi 0x7fffffffebc0 140737488350144
rbp 0x1 0x1
rsp 0x7fffffffeb90 0x7fffffffeb90
r8 0x4015a1 4199841
r9 0x400040 4194368
r10 0x0 0
r11 0x0 0
r12 0x7fffffffed58 140737488350552
r13 0x401127 4198695
r14 0x0 0
r15 0x0 0
rip 0x40141c 0x40141c <static_init_tls+24>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
next prev parent reply other threads:[~2018-07-18 19:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 16:39 Reiner Herrmann
2018-07-18 17:37 ` Rich Felker
2018-07-18 18:14 ` Reiner Herrmann
2018-07-18 19:00 ` Szabolcs Nagy [this message]
2018-07-18 19:38 ` Szabolcs Nagy
2018-07-18 20:19 ` Szabolcs Nagy
2018-07-18 20:24 ` Szabolcs Nagy
2018-07-18 20:50 ` Rich Felker
2018-07-18 20:53 ` Reiner Herrmann
2018-07-18 21:37 ` Szabolcs Nagy
2018-07-18 21:49 ` Reiner Herrmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180718190024.GL4418@port70.net \
--to=nsz@port70.net \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).