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Message-Id: <1534457824-7211-8-git-send-email-alex.popov@linux.com>
Date: Fri, 17 Aug 2018 01:17:04 +0300
From: Alexander Popov <alex.popov@...ux.com>
To: kernel-hardening@...ts.openwall.com,
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alex.popov@...ux.com
Subject: [PATCH v15 7/7] 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@...ux.com>
---
arch/arm64/kernel/process.c | 22 ----------------------
1 file changed, 22 deletions(-)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 7f1628e..740b31f 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -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
--
2.7.4
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