https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102952
--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to peterz from comment #13) > (In reply to H.J. Lu from comment #12) > > (In reply to peterz from comment #9) > > > Created attachment 51683 [details] > > > kernel patch to test -mharden-sls=all > > > > > > $ make O=defconfig CC=gcc-12.0.0 arch/x86/entry/common.o > > > ... > > > arch/x86/entry/common.o: warning: objtool: do_SYSENTER_32()+0x1b: > > > unreachable instruction > > > > Please try the v2 patch. > > Per comment #6 this should be v3, no? Anyway, the good news is that I now > seem to have a kernel image with lots of extra int3 instructions, but all in > the right place. > > *However*, I seem to be missing a few: > > 36f4: 41 5f pop %r15 > 36f6: e9 00 00 00 00 jmp 36fb > <__do_set_cpus_allowed+0x5b> > 36f7: R_X86_64_PLT32 __x86_indirect_thunk_rax-0x4 This is a direct branch. > 36fb: 48 8b 87 90 02 00 00 mov 0x290(%rdi),%rax > > There should be one after the jmp __x86_indirect_thunk_* thingy. I'll do an > objtool patch to search for missing int3, but that'll have to wait until > tomorrow, it's past midnight.
