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author | Sami Tolvanen <samitolvanen@google.com> | 2019-04-15 09:49:56 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 19:41:22 +0200 |
commit | 3b51d71365e0801e19fe81b66b34f2f19935a9ed (patch) | |
tree | afc51af01a38835d38771ca4707b551a57c1a1a5 /arch/x86/kernel/reboot.c | |
parent | 8eb64692d6e2ce8cb558c34b7a96e3182a533ff2 (diff) | |
download | linux-stable-3b51d71365e0801e19fe81b66b34f2f19935a9ed.tar.gz linux-stable-3b51d71365e0801e19fe81b66b34f2f19935a9ed.tar.bz2 linux-stable-3b51d71365e0801e19fe81b66b34f2f19935a9ed.zip |
x86/build/lto: Fix truncated .bss with -fdata-sections
[ Upstream commit 6a03469a1edc94da52b65478f1e00837add869a3 ]
With CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y, we compile the kernel with
-fdata-sections, which also splits the .bss section.
The new section, with a new .bss.* name, which pattern gets missed by the
main x86 linker script which only expects the '.bss' name. This results
in the discarding of the second part and a too small, truncated .bss
section and an unhappy, non-working kernel.
Use the common BSS_MAIN macro in the linker script to properly capture
and merge all the generated BSS sections.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20190415164956.124067-1-samitolvanen@google.com
[ Extended the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86/kernel/reboot.c')
0 files changed, 0 insertions, 0 deletions