From 434eca873f14f618d6c2279b54fb809fb56f2c50 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Mon, 6 Nov 2023 17:25:40 -0300 Subject: elf: Fix _dl_debug_vdprintf to work before self-relocation The strlen might trigger and invalid GOT entry if it used before the process is self-relocated (for instance on dl-tunables if any error occurs). For i386, _dl_writev with PIE requires to use the old 'int $0x80' syscall mode because the calling the TLS register (gs) is not yet initialized. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- sysdeps/unix/sysv/linux/i386/dl-writev.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/i386/dl-writev.h (limited to 'sysdeps/unix/sysv/linux') diff --git a/sysdeps/unix/sysv/linux/i386/dl-writev.h b/sysdeps/unix/sysv/linux/i386/dl-writev.h new file mode 100644 index 0000000000..624d0e46b0 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/dl-writev.h @@ -0,0 +1,24 @@ +/* Message-writing for the dynamic linker. Linux/i386 version. + Copyright (C) 2013-2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#if BUILD_PIE_DEFAULT +/* Can't use "call *%gs:SYSINFO_OFFSET" during startup in static PIE. */ +# define I386_USE_SYSENTER 0 +#endif + +#include -- cgit v1.2.3