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arm64: Drop unneeded stackleak_check_alloca() 

Drop stackleak_check_alloca() for arm64 since the STACKLEAK gcc plugin now
doesn't track stack depth overflow caused by alloca().

Signed-off-by: Alexander Popov <alex.popov@linux.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Alexander Popov 2018-08-17 01:17:04 +03:00 committed by Kees Cook
parent 964c9dff00
commit 6fcde90466
1 changed files with 0 additions and 22 deletions
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22
arch/arm64/kernel/process.c
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@ -493,25 +493,3 @@ void arch_setup_new_exec(void)
{
current->mm->context.flags = is_compat_task() ? MMCF_AARCH32 : 0;
}
#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
void __used stackleak_check_alloca(unsigned long size)
{
unsigned long stack_left;
unsigned long current_sp = current_stack_pointer;
struct stack_info info;
BUG_ON(!on_accessible_stack(current, current_sp, &info));
stack_left = current_sp - info.low;
/*
* There's a good chance we're almost out of stack space if this
* is true. Using panic() over BUG() is more likely to give
* reliable debugging output.
*/
if (size >= stack_left)
panic("alloca() over the kernel stack boundary\n");
}
EXPORT_SYMBOL(stackleak_check_alloca);
#endif