The following commit has been merged into the x86/sev branch of tip:
Commit-ID: ce6565282b3b16fd850c6a676f78c6bc76d0c235
Gitweb: https://git.kernel.org/tip/ce6565282b3b16fd850c6a676f78c6bc76d0c235
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Fri, 20 May 2022 10:26:04 +02:00
Committer: Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 20 May 2022 12:04:56 +02:00
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 <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lore.kernel.org/r/20220520082604.GQ2578@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
---
arch/x86/entry/entry_64.S | 3 +++
arch/x86/entry/entry_64_compat.S | 3 +++
2 files changed, 6 insertions(+)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 2fd8a5c..58a2d76 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -216,9 +216,12 @@ syscall_return_via_sysret:
popq %rdi
popq %rsp
SYM_INNER_LABEL(entry_SYSRETQ_unsafe_stack, SYM_L_GLOBAL)
+ ANNOTATE_NOENDBR
swapgs
sysretq
SYM_INNER_LABEL(entry_SYSRETQ_end, SYM_L_GLOBAL)
+ ANNOTATE_NOENDBR
+ int3
SYM_CODE_END(entry_SYSCALL_64)
/*
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 3c0e149..8011021 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)
/*
|