[PATCH] powerpc: add link stack flush mitigation status in debugfs.
From: Michal Suchanek <hidden>
Date: 2019-11-27 22:10:06
The link stack flush status is not visible in debugfs. It can be enabled even when count cache flush is disabled. Add separate file for its status. Signed-off-by: Michal Suchanek <redacted> --- arch/powerpc/kernel/security.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 7d4b2080a658..56dce4798a4d 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c@@ -446,14 +446,26 @@ static int count_cache_flush_get(void *data, u64 *val) return 0; } +static int link_stack_flush_get(void *data, u64 *val) +{ + *val = link_stack_flush_enabled; + + return 0; +} + DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get, count_cache_flush_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get, + count_cache_flush_set, "%llu\n"); static __init int count_cache_flush_debugfs_init(void) { debugfs_create_file_unsafe("count_cache_flush", 0600, powerpc_debugfs_root, NULL, &fops_count_cache_flush); + debugfs_create_file_unsafe("link_stack_flush", 0600, + powerpc_debugfs_root, NULL, + &fops_link_stack_flush); return 0; } device_initcall(count_cache_flush_debugfs_init);
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2.23.0