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Subject[patch V3 30/32] x86/irq/64: Split the IRQ stack into its own pages
From: Andy Lutomirski <luto@kernel.org>

Currently the IRQ stack is hardcoded as the first page of the percpu area,
and the stack canary lives on the IRQ stack. The former gets in the way of
adding an IRQ stack guard page, and the latter is a potential weakness in
the stack canary mechanism.

Split the IRQ stack into its own private percpu pages.

[ tglx: Make 64 and 32 bit share struct irq_stack ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/entry/entry_64.S | 4 ++--
arch/x86/include/asm/processor.h | 32 ++++++++++++++------------------
arch/x86/include/asm/stackprotector.h | 6 +++---
arch/x86/kernel/asm-offsets_64.c | 2 +-
arch/x86/kernel/cpu/common.c | 8 ++++----
arch/x86/kernel/head_64.S | 2 +-
arch/x86/kernel/irq_64.c | 5 ++++-
arch/x86/kernel/setup_percpu.c | 5 -----
arch/x86/kernel/vmlinux.lds.S | 7 ++++---
arch/x86/tools/relocs.c | 2 +-
arch/x86/xen/xen-head.S | 10 +++++-----
11 files changed, 39 insertions(+), 44 deletions(-)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -298,7 +298,7 @@ ENTRY(__switch_to_asm)

#ifdef CONFIG_STACKPROTECTOR
movq TASK_stack_canary(%rsi), %rbx
- movq %rbx, PER_CPU_VAR(irq_stack_union)+stack_canary_offset
+ movq %rbx, PER_CPU_VAR(fixed_percpu_data) + stack_canary_offset
#endif

#ifdef CONFIG_RETPOLINE
@@ -430,7 +430,7 @@ END(irq_entries_start)
* it before we actually move ourselves to the IRQ stack.
*/

- movq \old_rsp, PER_CPU_VAR(irq_stack_union + IRQ_STACK_SIZE - 8)
+ movq \old_rsp, PER_CPU_VAR(irq_stack_backing_store + IRQ_STACK_SIZE - 8)
movq PER_CPU_VAR(hardirq_stack_ptr), %rsp

#ifdef CONFIG_DEBUG_ENTRY
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -367,6 +367,13 @@ DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_
#define __KERNEL_TSS_LIMIT \
(IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)

+/* Per CPU interrupt stacks */
+struct irq_stack {
+ char stack[IRQ_STACK_SIZE];
+} __aligned(IRQ_STACK_SIZE);
+
+DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
+
#ifdef CONFIG_X86_32
DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
#else
@@ -375,28 +382,24 @@ DECLARE_PER_CPU(unsigned long, cpu_curre
#endif

#ifdef CONFIG_X86_64
-union irq_stack_union {
- char irq_stack[IRQ_STACK_SIZE];
+struct fixed_percpu_data {
/*
* GCC hardcodes the stack canary as %gs:40. Since the
* irq_stack is the object at %gs:0, we reserve the bottom
* 48 bytes of the irq stack for the canary.
*/
- struct {
- char gs_base[40];
- unsigned long stack_canary;
- };
+ char gs_base[40];
+ unsigned long stack_canary;
};

-DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __visible;
-DECLARE_INIT_PER_CPU(irq_stack_union);
+DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
+DECLARE_INIT_PER_CPU(fixed_percpu_data);

static inline unsigned long cpu_kernelmode_gs_base(int cpu)
{
- return (unsigned long)per_cpu(irq_stack_union.gs_base, cpu);
+ return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
}

-DECLARE_PER_CPU(char *, hardirq_stack_ptr);
DECLARE_PER_CPU(unsigned int, irq_count);
extern asmlinkage void ignore_sysret(void);

@@ -418,14 +421,7 @@ struct stack_canary {
};
DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
#endif
-/*
- * per-CPU IRQ handling stacks
- */
-struct irq_stack {
- char stack[IRQ_STACK_SIZE];
-} __aligned(IRQ_STACK_SIZE);
-
-DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
+/* Per CPU softirq stack pointer */
DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
#endif /* X86_64 */

--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -13,7 +13,7 @@
* On x86_64, %gs is shared by percpu area and stack canary. All
* percpu symbols are zero based and %gs points to the base of percpu
* area. The first occupant of the percpu area is always
- * irq_stack_union which contains stack_canary at offset 40. Userland
+ * fixed_percpu_data which contains stack_canary at offset 40. Userland
* %gs is always saved and restored on kernel entry and exit using
* swapgs, so stack protector doesn't add any complexity there.
*
@@ -64,7 +64,7 @@ static __always_inline void boot_init_st
u64 tsc;

#ifdef CONFIG_X86_64
- BUILD_BUG_ON(offsetof(union irq_stack_union, stack_canary) != 40);
+ BUILD_BUG_ON(offsetof(struct fixed_percpu_data, stack_canary) != 40);
#endif
/*
* We both use the random pool and the current TSC as a source
@@ -79,7 +79,7 @@ static __always_inline void boot_init_st

current->stack_canary = canary;
#ifdef CONFIG_X86_64
- this_cpu_write(irq_stack_union.stack_canary, canary);
+ this_cpu_write(fixed_percpu_data.stack_canary, canary);
#else
this_cpu_write(stack_canary.canary, canary);
#endif
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -73,7 +73,7 @@ int main(void)
BLANK();

#ifdef CONFIG_STACKPROTECTOR
- DEFINE(stack_canary_offset, offsetof(union irq_stack_union, stack_canary));
+ DEFINE(stack_canary_offset, offsetof(struct fixed_percpu_data, stack_canary));
BLANK();
#endif

--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1498,9 +1498,9 @@ static __init int setup_clearcpuid(char
__setup("clearcpuid=", setup_clearcpuid);

#ifdef CONFIG_X86_64
-DEFINE_PER_CPU_FIRST(union irq_stack_union,
- irq_stack_union) __aligned(PAGE_SIZE) __visible;
-EXPORT_PER_CPU_SYMBOL_GPL(irq_stack_union);
+DEFINE_PER_CPU_FIRST(struct fixed_percpu_data,
+ fixed_percpu_data) __aligned(PAGE_SIZE) __visible;
+EXPORT_PER_CPU_SYMBOL_GPL(fixed_percpu_data);

/*
* The following percpu variables are hot. Align current_task to
@@ -1510,7 +1510,7 @@ DEFINE_PER_CPU(struct task_struct *, cur
&init_task;
EXPORT_PER_CPU_SYMBOL(current_task);

-DEFINE_PER_CPU(char *, hardirq_stack_ptr);
+DEFINE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
DEFINE_PER_CPU(unsigned int, irq_count) __visible = -1;

DEFINE_PER_CPU(int, __preempt_count) = INIT_PREEMPT_COUNT;
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -265,7 +265,7 @@ ENDPROC(start_cpu0)
GLOBAL(initial_code)
.quad x86_64_start_kernel
GLOBAL(initial_gs)
- .quad INIT_PER_CPU_VAR(irq_stack_union)
+ .quad INIT_PER_CPU_VAR(fixed_percpu_data)
GLOBAL(initial_stack)
/*
* The SIZEOF_PTREGS gap is a convention which helps the in-kernel
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -23,6 +23,9 @@
#include <asm/io_apic.h>
#include <asm/apic.h>

+DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;
+DECLARE_INIT_PER_CPU(irq_stack_backing_store);
+
int sysctl_panic_on_stackoverflow;

/*
@@ -90,7 +93,7 @@ bool handle_irq(struct irq_desc *desc, s

static int map_irq_stack(unsigned int cpu)
{
- void *va = per_cpu_ptr(irq_stack_union.irq_stack, cpu);
+ void *va = per_cpu_ptr(&irq_stack_backing_store, cpu);

per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE;
return 0;
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -244,11 +244,6 @@ void __init setup_per_cpu_areas(void)
per_cpu(x86_cpu_to_logical_apicid, cpu) =
early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
#endif
-#ifdef CONFIG_X86_64
- per_cpu(hardirq_stack_ptr, cpu) =
- per_cpu(irq_stack_union.irq_stack, cpu) +
- IRQ_STACK_SIZE;
-#endif
#ifdef CONFIG_NUMA
per_cpu(x86_cpu_to_node_map, cpu) =
early_per_cpu_map(x86_cpu_to_node_map, cpu);
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -403,7 +403,8 @@ SECTIONS
*/
#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x) + __per_cpu_load
INIT_PER_CPU(gdt_page);
-INIT_PER_CPU(irq_stack_union);
+INIT_PER_CPU(fixed_percpu_data);
+INIT_PER_CPU(irq_stack_backing_store);

/*
* Build-time check on the image size:
@@ -412,8 +413,8 @@ INIT_PER_CPU(irq_stack_union);
"kernel image bigger than KERNEL_IMAGE_SIZE");

#ifdef CONFIG_SMP
-. = ASSERT((irq_stack_union == 0),
- "irq_stack_union is not at start of per-cpu area");
+. = ASSERT((fixed_percpu_data == 0),
+ "fixed_percpu_data is not at start of per-cpu area");
#endif

#endif /* CONFIG_X86_32 */
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -738,7 +738,7 @@ static void percpu_init(void)
* __per_cpu_load
*
* The "gold" linker incorrectly associates:
- * init_per_cpu__irq_stack_union
+ * init_per_cpu__fixed_percpu_data
* init_per_cpu__gdt_page
*/
static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -40,13 +40,13 @@ ENTRY(startup_xen)
#ifdef CONFIG_X86_64
/* Set up %gs.
*
- * The base of %gs always points to the bottom of the irqstack
- * union. If the stack protector canary is enabled, it is
- * located at %gs:40. Note that, on SMP, the boot cpu uses
- * init data section till per cpu areas are set up.
+ * The base of %gs always points to fixed_percpu_data. If the
+ * stack protector canary is enabled, it is located at %gs:40.
+ * Note that, on SMP, the boot cpu uses init data section until
+ * the per cpu areas are set up.
*/
movl $MSR_GS_BASE,%ecx
- movq $INIT_PER_CPU_VAR(irq_stack_union),%rax
+ movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax
cdq
wrmsr
#endif

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