From 2039bda1fa8dad3f4275b29eeaffef545bcbc85d Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Fri, 2 Oct 2020 10:38:23 -0700 Subject: LSM: Add "contents" flag to kernel_read_file hook As with the kernel_load_data LSM hook, add a "contents" flag to the kernel_read_file LSM hook that indicates whether the LSM can expect a matching call to the kernel_post_read_file LSM hook with the full contents of the file. With the coming addition of partial file read support for kernel_read_file*() API, the LSM will no longer be able to always see the entire contents of a file during the read calls. For cases where the LSM must read examine the complete file contents, it will need to do so on its own every time the kernel_read_file hook is called with contents=false (or reject such cases). Adjust all existing LSMs to retain existing behavior. Signed-off-by: Kees Cook Reviewed-by: Mimi Zohar Link: https://lore.kernel.org/r/20201002173828.2099543-12-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman --- fs/kernel_read_file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/kernel_read_file.c') diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c index 2e29c38eb4df..d73bc3fa710a 100644 --- a/fs/kernel_read_file.c +++ b/fs/kernel_read_file.c @@ -39,7 +39,7 @@ int kernel_read_file(struct file *file, void **buf, if (ret) return ret; - ret = security_kernel_read_file(file, id); + ret = security_kernel_read_file(file, id, true); if (ret) goto out; -- cgit v1.2.3