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arm64: Add stack information to on_accessible_stack

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In preparation for enabling the stackleak plugin on arm64,
we need a way to get the bounds of the current stack. Extend
on_accessible_stack to get this information.

Acked-by: Alexander Popov <alex.popov@linux.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
[will: folded in fix for allmodconfig build breakage w/ sdei]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Laura Abbott
2018-07-20 14:41:53 -07:00
committed by Will Deacon
parent 2c870e6113
commit 8a1ccfbc9e
5 changed files with 111 additions and 26 deletions
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51
arch/arm64/kernel/sdei.c
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@@ -13,6 +13,7 @@
#include <asm/mmu.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/stacktrace.h>
#include <asm/sysreg.h>
#include <asm/vmap_stack.h>
@@ -88,23 +89,55 @@ static int init_sdei_stacks(void)
return err;
}
bool _on_sdei_stack(unsigned long sp)
bool on_sdei_normal_stack(unsigned long sp,
struct stack_info *info)
{
unsigned long low, high;
unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
unsigned long high = low + SDEI_STACK_SIZE;
if (sp < low || sp >= high)
return false;
if (info) {
info->low = low;
info->high = high;
info->type = STACK_TYPE_SDEI_NORMAL;
}
return true;
}
bool on_sdei_critical_stack(unsigned long sp,
struct stack_info *info)
{
unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
unsigned long high = low + SDEI_STACK_SIZE;
if (sp < low || sp >= high)
return false;
if (info) {
info->low = low;
info->high = high;
info->type = STACK_TYPE_SDEI_CRITICAL;
}
return true;
}
bool _on_sdei_stack(unsigned long sp,
struct stack_info *info)
{
if (!IS_ENABLED(CONFIG_VMAP_STACK))
return false;
low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
high = low + SDEI_STACK_SIZE;
if (low <= sp && sp < high)
if (on_sdei_critical_stack(sp, info))
return true;
low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
high = low + SDEI_STACK_SIZE;
if (on_sdei_normal_stack(sp, info))
return true;
return (low <= sp && sp < high);
return false;
}
unsigned long sdei_arch_get_entry_point(int conduit)