| Message ID | 20191127220959.6208-1-msuchanek@suse.de (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | powerpc: add link stack flush mitigation status in debugfs. | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch powerpc/merge (2ec2260ce7bce5eb6a8ced0bb78d75c1b3eca306) |
| snowpatch_ozlabs/build-ppc64le | fail | build failed! |
| snowpatch_ozlabs/build-ppc64be | fail | build failed! |
| snowpatch_ozlabs/build-ppc64e | success | Build succeeded |
| snowpatch_ozlabs/build-pmac32 | success | Build succeeded |
| snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 26 lines checked |
| snowpatch_ozlabs/needsstable | success | Patch has no Fixes tags |
On Wed, 27 Nov 2019 23:09:59 +0100, Michal Suchanek wrote: > 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. > > Applied to powerpc/next. [1/1] powerpc: add link stack flush mitigation status in debugfs. https://git.kernel.org/powerpc/c/b2a6f6043577e09d51a4b5577fff9fc9f5b14b1c cheers
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);
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 <msuchanek@suse.de> --- arch/powerpc/kernel/security.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)