c8d126275a
Introduce CONFIG_STACKLEAK_METRICS providing STACKLEAK information about tasks via the /proc file system. In particular, /proc/<pid>/stack_depth shows the maximum kernel stack consumption for the current and previous syscalls. Although this information is not precise, it can be useful for estimating the STACKLEAK performance impact for your workloads. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Alexander Popov <alex.popov@linux.com> Tested-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org>
30 lines
746 B
C
30 lines
746 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_STACKLEAK_H
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#define _LINUX_STACKLEAK_H
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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/*
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* Check that the poison value points to the unused hole in the
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* virtual memory map for your platform.
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*/
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#define STACKLEAK_POISON -0xBEEF
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#define STACKLEAK_SEARCH_DEPTH 128
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#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
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#include <asm/stacktrace.h>
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static inline void stackleak_task_init(struct task_struct *t)
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{
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t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
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# ifdef CONFIG_STACKLEAK_METRICS
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t->prev_lowest_stack = t->lowest_stack;
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# endif
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}
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#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
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static inline void stackleak_task_init(struct task_struct *t) { }
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#endif
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#endif
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