From a1db74209483a24c861c848b4bb79a4d945ef6fa Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Wed, 30 Dec 2015 07:35:30 -0500 Subject: module: replace copy_module_from_fd with kernel version Replace copy_module_from_fd() with kernel_read_file_from_fd(). Although none of the upstreamed LSMs define a kernel_module_from_file hook, IMA is called, based on policy, to prevent unsigned kernel modules from being loaded by the original kernel module syscall and to measure/appraise signed kernel modules. The security function security_kernel_module_from_file() was called prior to reading a kernel module. Preventing unsigned kernel modules from being loaded by the original kernel module syscall remains on the pre-read kernel_read_file() security hook. Instead of reading the kernel module twice, once for measuring/appraising and again for loading the kernel module, the signature validation is moved to the kernel_post_read_file() security hook. This patch removes the security_kernel_module_from_file() hook and security call. Signed-off-by: Mimi Zohar Acked-by: Kees Cook Acked-by: Luis R. Rodriguez Cc: Rusty Russell --- include/linux/ima.h | 6 ------ 1 file changed, 6 deletions(-) (limited to 'include/linux/ima.h') diff --git a/include/linux/ima.h b/include/linux/ima.h index 6adcaea8101c..e6516cbbe9bf 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -18,7 +18,6 @@ extern int ima_bprm_check(struct linux_binprm *bprm); extern int ima_file_check(struct file *file, int mask, int opened); extern void ima_file_free(struct file *file); extern int ima_file_mmap(struct file *file, unsigned long prot); -extern int ima_module_check(struct file *file); extern int ima_read_file(struct file *file, enum kernel_read_file_id id); extern int ima_post_read_file(struct file *file, void *buf, loff_t size, enum kernel_read_file_id id); @@ -44,11 +43,6 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot) return 0; } -static inline int ima_module_check(struct file *file) -{ - return 0; -} - static inline int ima_read_file(struct file *file, enum kernel_read_file_id id) { return 0; -- cgit