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authorAlexander Popov <alex.popov@linux.com>2018-08-17 01:17:03 +0300
committerKees Cook <keescook@chromium.org>2018-09-04 10:35:48 -0700
commit964c9dff0091893a9a74a88edf984c6da0b779f7 (patch)
tree162d45af3ac44401db524294e67e396ddee476f4 /include/linux/stackleak.h
parented535a2dae1836d15c71e250475952881265d244 (diff)
stackleak: Allow runtime disabling of kernel stack erasing
Introduce CONFIG_STACKLEAK_RUNTIME_DISABLE option, which provides 'stack_erasing' sysctl. It can be used in runtime to control kernel stack erasing for kernels built with CONFIG_GCC_PLUGIN_STACKLEAK. 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>
Diffstat (limited to 'include/linux/stackleak.h')
-rw-r--r--include/linux/stackleak.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/stackleak.h b/include/linux/stackleak.h
index b911b973d328..3d5c3271a9a8 100644
--- a/include/linux/stackleak.h
+++ b/include/linux/stackleak.h
@@ -22,6 +22,12 @@ static inline void stackleak_task_init(struct task_struct *t)
t->prev_lowest_stack = t->lowest_stack;
# endif
}
+
+#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
+int stack_erasing_sysctl(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif
+
#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
static inline void stackleak_task_init(struct task_struct *t) { }
#endif