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| author | Will Deacon <will.deacon@arm.com> | 2014-08-29 17:11:10 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-08-29 17:11:10 +0200 |
| commit | 3168a743461ecf86adf3e7dcfcd79271828fb263 (patch) | |
| tree | 023ea03c1e59f6ec198a1b2608fe8a920563956b /arch | |
| parent | arm64: Add brackets around user_stack_pointer() (diff) | |
| download | linux-3168a743461ecf86adf3e7dcfcd79271828fb263.tar.xz linux-3168a743461ecf86adf3e7dcfcd79271828fb263.zip | |
arm64: report correct stack pointer in KSTK_ESP for compat tasks
The KSTK_ESP macro is used to determine the user stack pointer for a
given task. In particular, this is used to to report the '[stack]' VMA
in /proc/self/maps, which is used by Android to determine the stack
location for children of the main thread.
This patch fixes the macro to use user_stack_pointer instead of directly
returning sp. This means that we report w13 instead of sp, since the
former is used as the stack pointer when executing in AArch32 state.
Cc: <stable@vger.kernel.org>
Reported-by: Serban Constantinescu <Serban.Constantinescu@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/processor.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 3df21feeabdd..286b1bec547c 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -139,7 +139,7 @@ extern struct task_struct *cpu_switch_to(struct task_struct *prev, ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) -#define KSTK_ESP(tsk) ((unsigned long)task_pt_regs(tsk)->sp) +#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) /* * Prefetching support |