Messages in this thread Patch in this message | | | Date | Thu, 26 May 2022 12:52:53 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 1/7] x86/entry: Anchor annotation |
| |
x86_64-allmodconfig gives:
vmlinux.o: warning: objtool: entry_SYSCALL_compat+0x0: ANNOTATE_NOENDBR on ENDBR
This is due to:
ANNOTATE_NOENDBR SYM_CODE_END(entry_SYSENTER_compat) SYM_CODE_START(entry_SYSCALL_compat) UNWIND_HINT_EMPTY ENDBR
And the hint then landing on the first instruction of the next symbol, which happens to be ENDBR. Stick in an int3 to anchor the annotation in the previous symbol.
Fixes: 3e3f06950434 ("x86/ibt: Annotate text references") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- arch/x86/entry/entry_64_compat.S | 1 + 1 file changed, 1 insertion(+)
--- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -124,6 +124,7 @@ SYM_INNER_LABEL(entry_SYSENTER_compat_af jmp .Lsysenter_flags_fixed SYM_INNER_LABEL(__end_entry_SYSENTER_compat, SYM_L_GLOBAL) ANNOTATE_NOENDBR // is_sysenter_singlestep + int3 SYM_CODE_END(entry_SYSENTER_compat) /*
| |