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Subject[tip: x86/core] x86/ibt,entry: Sprinkle ENDBR dust
The following commit has been merged into the x86/core branch of tip:

Commit-ID: 8f93402b92d443573d310250efa0b7f352fec992
Gitweb: https://git.kernel.org/tip/8f93402b92d443573d310250efa0b7f352fec992
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 08 Mar 2022 16:30:24 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:35 +01:00

x86/ibt,entry: Sprinkle ENDBR dust

Kernel entry points should be having ENDBR on for IBT configs.

The SYSCALL entry points are found through taking their respective
address in order to program them in the MSRs, while the exception
entry points are found through UNWIND_HINT_IRET_REGS.

The rule is that any UNWIND_HINT_IRET_REGS at sym+0 should have an
ENDBR, see the later objtool ibt validation patch.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154317.933157479@infradead.org
---
arch/x86/entry/entry_64.S | 7 +++++++
arch/x86/entry/entry_64_compat.S | 3 +++
arch/x86/include/asm/idtentry.h | 20 +++++++++++---------
arch/x86/include/asm/segment.h | 3 ++-
arch/x86/kernel/head_64.S | 4 +++-
arch/x86/kernel/idt.c | 5 +++--
6 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 3fd3828..50b6118 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -86,6 +86,7 @@

SYM_CODE_START(entry_SYSCALL_64)
UNWIND_HINT_EMPTY
+ ENDBR

swapgs
/* tss.sp2 is scratch space. */
@@ -350,6 +351,7 @@ SYM_CODE_END(ret_from_fork)
.macro idtentry vector asmsym cfunc has_error_code:req
SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS offset=\has_error_code*8
+ ENDBR
ASM_CLAC

.if \has_error_code == 0
@@ -417,6 +419,7 @@ SYM_CODE_END(\asmsym)
.macro idtentry_mce_db vector asmsym cfunc
SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS
+ ENDBR
ASM_CLAC

pushq $-1 /* ORIG_RAX: no syscall to restart */
@@ -472,6 +475,7 @@ SYM_CODE_END(\asmsym)
.macro idtentry_vc vector asmsym cfunc
SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS
+ ENDBR
ASM_CLAC

/*
@@ -533,6 +537,7 @@ SYM_CODE_END(\asmsym)
.macro idtentry_df vector asmsym cfunc
SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS offset=8
+ ENDBR
ASM_CLAC

/* paranoid_entry returns GS information for paranoid_exit in EBX. */
@@ -1069,6 +1074,7 @@ SYM_CODE_END(error_return)
*/
SYM_CODE_START(asm_exc_nmi)
UNWIND_HINT_IRET_REGS
+ ENDBR

/*
* We allow breakpoints in NMIs. If a breakpoint occurs, then
@@ -1427,6 +1433,7 @@ SYM_CODE_END(asm_exc_nmi)
*/
SYM_CODE_START(ignore_sysret)
UNWIND_HINT_EMPTY
+ ENDBR
mov $-ENOSYS, %eax
sysretl
SYM_CODE_END(ignore_sysret)
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 0051cf5..35a0e69 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -48,6 +48,7 @@
*/
SYM_CODE_START(entry_SYSENTER_compat)
UNWIND_HINT_EMPTY
+ ENDBR
/* Interrupts are off on entry. */
SWAPGS

@@ -198,6 +199,7 @@ SYM_CODE_END(entry_SYSENTER_compat)
*/
SYM_CODE_START(entry_SYSCALL_compat)
UNWIND_HINT_EMPTY
+ ENDBR
/* Interrupts are off on entry. */
swapgs

@@ -340,6 +342,7 @@ SYM_CODE_END(entry_SYSCALL_compat)
*/
SYM_CODE_START(entry_INT80_compat)
UNWIND_HINT_EMPTY
+ ENDBR
/*
* Interrupts are off on entry.
*/
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 1345088..f84280a 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -5,6 +5,8 @@
/* Interrupts/Exceptions */
#include <asm/trapnr.h>

+#define IDT_ALIGN (8 * (1 + HAS_KERNEL_IBT))
+
#ifndef __ASSEMBLY__
#include <linux/entry-common.h>
#include <linux/hardirq.h>
@@ -480,7 +482,7 @@ __visible noinstr void func(struct pt_regs *regs, \

/*
* ASM code to emit the common vector entry stubs where each stub is
- * packed into 8 bytes.
+ * packed into IDT_ALIGN bytes.
*
* Note, that the 'pushq imm8' is emitted via '.byte 0x6a, vector' because
* GCC treats the local vector variable as unsigned int and would expand
@@ -492,33 +494,33 @@ __visible noinstr void func(struct pt_regs *regs, \
* point is to mask off the bits above bit 7 because the push is sign
* extending.
*/
- .align 8
+ .align IDT_ALIGN
SYM_CODE_START(irq_entries_start)
vector=FIRST_EXTERNAL_VECTOR
.rept NR_EXTERNAL_VECTORS
UNWIND_HINT_IRET_REGS
0 :
+ ENDBR
.byte 0x6a, vector
jmp asm_common_interrupt
- nop
- /* Ensure that the above is 8 bytes max */
- . = 0b + 8
+ /* Ensure that the above is IDT_ALIGN bytes max */
+ .fill 0b + IDT_ALIGN - ., 1, 0xcc
vector = vector+1
.endr
SYM_CODE_END(irq_entries_start)

#ifdef CONFIG_X86_LOCAL_APIC
- .align 8
+ .align IDT_ALIGN
SYM_CODE_START(spurious_entries_start)
vector=FIRST_SYSTEM_VECTOR
.rept NR_SYSTEM_VECTORS
UNWIND_HINT_IRET_REGS
0 :
+ ENDBR
.byte 0x6a, vector
jmp asm_spurious_interrupt
- nop
- /* Ensure that the above is 8 bytes max */
- . = 0b + 8
+ /* Ensure that the above is IDT_ALIGN bytes max */
+ .fill 0b + IDT_ALIGN - ., 1, 0xcc
vector = vector+1
.endr
SYM_CODE_END(spurious_entries_start)
diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 3a31d4e..656ed65 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -4,6 +4,7 @@

#include <linux/const.h>
#include <asm/alternative.h>
+#include <asm/ibt.h>

/*
* Constructor for a conventional segment GDT (or LDT) entry.
@@ -275,7 +276,7 @@ static inline void vdso_read_cpunode(unsigned *cpu, unsigned *node)
* vector has no error code (two bytes), a 'push $vector_number' (two
* bytes), and a jump to the common entry code (up to five bytes).
*/
-#define EARLY_IDT_HANDLER_SIZE 9
+#define EARLY_IDT_HANDLER_SIZE (9 + ENDBR_INSN_SIZE)

/*
* xen_early_idt_handler_array is for Xen pv guests: for each entry in
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 990960a..9b6fa76 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -371,9 +371,11 @@ SYM_CODE_START(early_idt_handler_array)
.rept NUM_EXCEPTION_VECTORS
.if ((EXCEPTION_ERRCODE_MASK >> i) & 1) == 0
UNWIND_HINT_IRET_REGS
+ ENDBR
pushq $0 # Dummy error code, to make stack frame uniform
.else
UNWIND_HINT_IRET_REGS offset=8
+ ENDBR
.endif
pushq $i # 72(%rsp) Vector number
jmp early_idt_handler_common
@@ -381,11 +383,11 @@ SYM_CODE_START(early_idt_handler_array)
i = i + 1
.fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc
.endr
- UNWIND_HINT_IRET_REGS offset=16
SYM_CODE_END(early_idt_handler_array)
ANNOTATE_NOENDBR // early_idt_handler_array[NUM_EXCEPTION_VECTORS]

SYM_CODE_START_LOCAL(early_idt_handler_common)
+ UNWIND_HINT_IRET_REGS offset=16
/*
* The stack is the hardware frame, an error code or zero, and the
* vector number.
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index df0fa69..7676e34 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -10,6 +10,7 @@
#include <asm/proto.h>
#include <asm/desc.h>
#include <asm/hw_irq.h>
+#include <asm/idtentry.h>

#define DPL0 0x0
#define DPL3 0x3
@@ -272,7 +273,7 @@ void __init idt_setup_apic_and_irq_gates(void)
idt_setup_from_table(idt_table, apic_idts, ARRAY_SIZE(apic_idts), true);

for_each_clear_bit_from(i, system_vectors, FIRST_SYSTEM_VECTOR) {
- entry = irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR);
+ entry = irq_entries_start + IDT_ALIGN * (i - FIRST_EXTERNAL_VECTOR);
set_intr_gate(i, entry);
}

@@ -283,7 +284,7 @@ void __init idt_setup_apic_and_irq_gates(void)
* system_vectors bitmap. Otherwise they show up in
* /proc/interrupts.
*/
- entry = spurious_entries_start + 8 * (i - FIRST_SYSTEM_VECTOR);
+ entry = spurious_entries_start + IDT_ALIGN * (i - FIRST_SYSTEM_VECTOR);
set_intr_gate(i, entry);
}
#endif
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