pstore/ram: Should zap persistent zone on unlink

Otherwise, unlinked file will reappear on the next boot.

Reported-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 16ff7332eae0a99db545598fcbdf4443e4fa9cfa..453030f9c5bc2a68523cafc26c6d331d86855949 100644 (file)
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -186,6 +186,7 @@ static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
                return -EINVAL;
 
        persistent_ram_free_old(cxt->przs[id]);
+       persistent_ram_zap(cxt->przs[id]);
 
        return 0;
 }