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Date: Fri, 5 Apr 2024 00:26:57 +0000 (UTC)
From: Thorsten Glaser <tg@...bsd.de>
To: musl@...ts.openwall.com
cc: 1068350@...s.debian.org, debian-glibc@...ts.debian.org, doko@...ian.org
Subject: Re: Bug#1068350: musl: miscompiles (runtime problems) on riscv64 and s390x with static-pie → seems to be a toolchain bug after all, it does too hit glibc
Dixi quod…
>Now I (or someone) is going to have to reduce that to a testcase, so
No success with that, unfortunately.
>But this does seem to be a toolchain bug: adding -static-pie to the
>glibc dynamic-pie link command and…
>
>(gdb) print initcoms
>$1 = {0xda494 "typeset", 0x0, 0x0, 0x0, 0xda494 "typeset", 0x0, 0xd942c "HOME", 0xda7d8 "PATH",
Wait, what?
(gdb) b main
Breakpoint 1 at 0xd820: file ../../main.c, line 785.
(gdb) print initcoms
$1 = {0xda494 "typeset", 0x0, 0x0, 0x0, 0xda494 "typeset", 0x0, 0xd942c "HOME", 0xda7d8 "PATH",
[…]
(gdb) r
Starting program: /home/tg/mksh-59c/builddir/full/mksh
Breakpoint 1, main (argc=1, argv=0x3ffffffa4d8) at ../../main.c:785
785 {
(gdb) print initcoms
$2 = {0x3fff7eda494 "typeset", 0x3fff7ee4548 <u_ops+128> "-r",
0x3fff7ee4ae0 <initvsn> "KSH_VERSION=@(#)MIRBSD KSH R59 2024/02/01 +Debian", 0x0, 0x3fff7eda494 "typeset",
[…]
While in musl:
(gdb) print initcoms
$1 = {0x414a4 "typeset", 0x0, 0x0, 0x0, 0x414a4 "typeset", 0x0, 0x40478 "HOME", 0x41d42 "PATH",
[…]
(gdb) r
Starting program: /home/tg/mksh-59c/builddir/static-musl/mksh
Breakpoint 1, main (argc=1, argv=0x3ffffffa498) at ../../main.c:785
785 {
(gdb) print initcoms
$2 = {0x3fff7fc14a4 "typeset", 0x0, 0x0, 0x0, 0x3fff7fc14a4 "typeset", 0x0, 0x3fff7fc0478 "HOME",
[…]
So the existing ones did get relocated, but the nullptrs stayed thusly.
Apparently, it *is* supported on glibc on s390x, mjt (qemu maintainer)
also said so in 2023.
bye,
//mirabilos
--
22:20⎜<asarch> The crazy that persists in his craziness becomes a master
22:21⎜<asarch> And the distance between the craziness and geniality is
only measured by the success 18:35⎜<asarch> "Psychotics are consistently
inconsistent. The essence of sanity is to be inconsistently inconsistent
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