* linux-next: build warnings after merge of the tip tree
@ 2022-05-20 7:49 Stephen Rothwell
2022-05-20 8:26 ` [PATCH] x86/entry: Fixup objtool/ibt validation Peter Zijlstra
0 siblings, 1 reply; 3+ messages in thread
From: Stephen Rothwell @ 2022-05-20 7:49 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, H. Peter Anvin, Peter Zijlstra
Cc: Linux Kernel Mailing List, Linux Next Mailing List
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Hi all,
After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
produced these warnings:
vmlinux.o: warning: objtool: vc_switch_off_ist+0x76: relocation to !ENDBR: entry_SYSCALL_64+0x15c
vmlinux.o: warning: objtool: vc_switch_off_ist+0x8e: relocation to !ENDBR: entry_SYSCALL_compat+0xa5
vmlinux.o: warning: objtool: vc_switch_off_ist+0x96: relocation to !ENDBR: .entry.text+0x21ca
vmlinux.o: warning: objtool: vc_switch_off_ist+0xee: relocation to !ENDBR: .entry.text+0x162
vmlinux.o: warning: objtool: __sev_es_ist_enter+0x5f: relocation to !ENDBR: entry_SYSCALL_64+0x15c
vmlinux.o: warning: objtool: __sev_es_ist_enter+0x6b: relocation to !ENDBR: .entry.text+0x162
vmlinux.o: warning: objtool: __sev_es_ist_enter+0x89: relocation to !ENDBR: entry_SYSCALL_compat+0xa5
vmlinux.o: warning: objtool: __sev_es_ist_enter+0xc0: relocation to !ENDBR: .entry.text+0x21ca
I don't know what caused this.
--
Cheers,
Stephen Rothwell
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] x86/entry: Fixup objtool/ibt validation
2022-05-20 7:49 linux-next: build warnings after merge of the tip tree Stephen Rothwell
@ 2022-05-20 8:26 ` Peter Zijlstra
2022-05-20 10:33 ` [tip: x86/sev] " tip-bot2 for Peter Zijlstra
0 siblings, 1 reply; 3+ messages in thread
From: Peter Zijlstra @ 2022-05-20 8:26 UTC (permalink / raw)
To: Stephen Rothwell
Cc: Thomas Gleixner, Ingo Molnar, H. Peter Anvin,
Linux Kernel Mailing List, Linux Next Mailing List,
jiangshan.ljs, bp
On Fri, May 20, 2022 at 05:49:54PM +1000, Stephen Rothwell wrote:
> Hi all,
>
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> produced these warnings:
>
> vmlinux.o: warning: objtool: vc_switch_off_ist+0x76: relocation to !ENDBR: entry_SYSCALL_64+0x15c
> vmlinux.o: warning: objtool: vc_switch_off_ist+0x8e: relocation to !ENDBR: entry_SYSCALL_compat+0xa5
> vmlinux.o: warning: objtool: vc_switch_off_ist+0x96: relocation to !ENDBR: .entry.text+0x21ca
> vmlinux.o: warning: objtool: vc_switch_off_ist+0xee: relocation to !ENDBR: .entry.text+0x162
> vmlinux.o: warning: objtool: __sev_es_ist_enter+0x5f: relocation to !ENDBR: entry_SYSCALL_64+0x15c
> vmlinux.o: warning: objtool: __sev_es_ist_enter+0x6b: relocation to !ENDBR: .entry.text+0x162
> vmlinux.o: warning: objtool: __sev_es_ist_enter+0x89: relocation to !ENDBR: entry_SYSCALL_compat+0xa5
> vmlinux.o: warning: objtool: __sev_es_ist_enter+0xc0: relocation to !ENDBR: .entry.text+0x21ca
>
> I don't know what caused this.
It's commit 47f33de4aafb ("x86/sev: Mark the code returning to user space as syscall gap")
that added a bunch of text references.
Lai, Boris, can we please be careful with that?
---
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 <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
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 5ec42bf86a61..221f82b4abc2 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -215,9 +215,12 @@ 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 84ffcf504554..95d23364a131 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -245,6 +245,7 @@ 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
@@ -263,6 +264,8 @@ 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)
/*
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [tip: x86/sev] x86/entry: Fixup objtool/ibt validation
2022-05-20 8:26 ` [PATCH] x86/entry: Fixup objtool/ibt validation Peter Zijlstra
@ 2022-05-20 10:33 ` tip-bot2 for Peter Zijlstra
0 siblings, 0 replies; 3+ messages in thread
From: tip-bot2 for Peter Zijlstra @ 2022-05-20 10:33 UTC (permalink / raw)
To: linux-tip-commits
Cc: Stephen Rothwell, Peter Zijlstra (Intel),
Borislav Petkov, x86, linux-kernel
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@infradead.org>
AuthorDate: Fri, 20 May 2022 10:26:04 +02:00
Committer: Borislav Petkov <bp@suse.de>
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@canb.auug.org.au>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220520082604.GQ2578@worktop.programming.kicks-ass.net
---
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)
/*
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2022-05-20 7:49 linux-next: build warnings after merge of the tip tree Stephen Rothwell
2022-05-20 8:26 ` [PATCH] x86/entry: Fixup objtool/ibt validation Peter Zijlstra
2022-05-20 10:33 ` [tip: x86/sev] " tip-bot2 for Peter Zijlstra
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