From ce6565282b3b16fd850c6a676f78c6bc76d0c235 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 20 May 2022 10:26:04 +0200 Subject: x86/entry: Fixup objtool/ibt validation Commit 47f33de4aafb ("x86/sev: Mark the code returning to user space as syscall gap") added a bunch of text references without annotating them, resulting in a spree of objtool complaints: vmlinux.o: warning: objtool: vc_switch_off_ist+0x77: relocation to !ENDBR: entry_SYSCALL_64+0x15c vmlinux.o: warning: objtool: vc_switch_off_ist+0x8f: relocation to !ENDBR: entry_SYSCALL_compat+0xa5 vmlinux.o: warning: objtool: vc_switch_off_ist+0x97: relocation to !ENDBR: .entry.text+0x21ea vmlinux.o: warning: objtool: vc_switch_off_ist+0xef: relocation to !ENDBR: .entry.text+0x162 vmlinux.o: warning: objtool: __sev_es_ist_enter+0x60: relocation to !ENDBR: entry_SYSCALL_64+0x15c vmlinux.o: warning: objtool: __sev_es_ist_enter+0x6c: relocation to !ENDBR: .entry.text+0x162 vmlinux.o: warning: objtool: __sev_es_ist_enter+0x8a: relocation to !ENDBR: entry_SYSCALL_compat+0xa5 vmlinux.o: warning: objtool: __sev_es_ist_enter+0xc1: relocation to !ENDBR: .entry.text+0x21ea Since these text references are used to compare against IP, and are not an indirect call target, they don't need ENDBR so annotate them away. Fixes: 47f33de4aafb ("x86/sev: Mark the code returning to user space as syscall gap") Reported-by: Stephen Rothwell Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Borislav Petkov Link: https://lore.kernel.org/r/20220520082604.GQ2578@worktop.programming.kicks-ass.net --- arch/x86/entry/entry_64_compat.S | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/entry/entry_64_compat.S') diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 3c0e14960e2b..8011021d7ce8 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -298,6 +298,7 @@ sysret32_from_system_call: */ movq RSP-ORIG_RAX(%rsp), %rsp SYM_INNER_LABEL(entry_SYSRETL_compat_unsafe_stack, SYM_L_GLOBAL) + ANNOTATE_NOENDBR /* * The original userspace %rsp (RSP-ORIG_RAX(%rsp)) is stored @@ -316,6 +317,8 @@ SYM_INNER_LABEL(entry_SYSRETL_compat_unsafe_stack, SYM_L_GLOBAL) swapgs sysretl SYM_INNER_LABEL(entry_SYSRETL_compat_end, SYM_L_GLOBAL) + ANNOTATE_NOENDBR + int3 SYM_CODE_END(entry_SYSCALL_compat) /* -- cgit v1.2.3