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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:40 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 434eca873f14f618d6c2279b54fb809fb56f2c50 (patch) | |
| tree | 9894611373fc3fa1e0ba24d89df0b4767beefd19 /sysdeps/unix/sysv/linux | |
| parent | 680c597e9c363bc74d1495b08f7a0593a80f8921 (diff) | |
| download | glibc-434eca873f14f618d6c2279b54fb809fb56f2c50.tar.gz glibc-434eca873f14f618d6c2279b54fb809fb56f2c50.tar.xz glibc-434eca873f14f618d6c2279b54fb809fb56f2c50.zip | |
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 <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/dl-writev.h | 24 |
1 files changed, 24 insertions, 0 deletions
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 + <https://www.gnu.org/licenses/>. */ + +#if BUILD_PIE_DEFAULT +/* Can't use "call *%gs:SYSINFO_OFFSET" during startup in static PIE. */ +# define I386_USE_SYSENTER 0 +#endif + +#include <sysdeps/unix/sysv/linux/dl-writev.h> |