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authorPeter Zijlstra <peterz@infradead.org>2021-12-04 14:43:44 +0100
committerBorislav Petkov <bp@suse.de>2021-12-09 13:32:25 +0100
commite463a09af2f0677b9485a7e8e4e70b396b2ffb6f (patch)
tree169cdec1cc953df3619ae2e08e662784211fbc24 /scripts/link-vmlinux.sh
parent26c44b776dba4ac692a0bf5a3836feb8a63fea6b (diff)
x86: Add straight-line-speculation mitigation
Make use of an upcoming GCC feature to mitigate straight-line-speculation for x86: https://gcc.gnu.org/g:53a643f8568067d7700a9f2facc8ba39974973d3 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102952 https://bugs.llvm.org/show_bug.cgi?id=52323 It's built tested on x86_64-allyesconfig using GCC-12 and GCC-11. Maintenance overhead of this should be fairly low due to objtool validation. Size overhead of all these additional int3 instructions comes to: text data bss dec hex filename 22267751 6933356 2011368 31212475 1dc43bb defconfig-build/vmlinux 22804126 6933356 1470696 31208178 1dc32f2 defconfig-build/vmlinux.sls Or roughly 2.4% additional text. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211204134908.140103474@infradead.org
Diffstat (limited to 'scripts/link-vmlinux.sh')
-rwxr-xr-xscripts/link-vmlinux.sh3
1 files changed, 3 insertions, 0 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 5cdd9bc5c385..9716f285e404 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -139,6 +139,9 @@ objtool_link()
if [ -n "${CONFIG_X86_SMAP}" ]; then
objtoolopt="${objtoolopt} --uaccess"
fi
+ if [ -n "${CONFIG_SLS}" ]; then
+ objtoolopt="${objtoolopt} --sls"
+ fi
info OBJTOOL ${1}
tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
fi