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Commit 6fcde904 authored by Alexander Popov's avatar Alexander Popov Committed by Kees Cook
Browse files

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: default avatarAlexander Popov <alex.popov@linux.com>
Tested-by: default avatarLaura Abbott <labbott@redhat.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 964c9dff

arch/arm64/kernel/process.c

+0 −22
Original line number Diff line number Diff line
@@ -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