| commit | e463a09af2f0677b9485a7e8e4e70b396b2ffb6f | [log] [tgz] |
|---|---|---|
| author | Peter Zijlstra <peterz@infradead.org> | Sat Dec 04 14:43:44 2021 +0100 |
| committer | Borislav Petkov <bp@suse.de> | Thu Dec 09 13:32:25 2021 +0100 |
| tree | 169cdec1cc953df3619ae2e08e662784211fbc24 | |
| parent | 26c44b776dba4ac692a0bf5a3836feb8a63fea6b [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