From b44a7dfc6fa16e01f2497c9fa62c3926f94be174 Mon Sep 17 00:00:00 2001 From: Mimi Zohar Date: Mon, 28 Dec 2015 16:02:29 -0500 Subject: vfs: define a generic function to read a file from the kernel For a while it was looked down upon to directly read files from Linux. These days there exists a few mechanisms in the kernel that do just this though to load a file into a local buffer. There are minor but important checks differences on each. This patch set is the first attempt at resolving some of these differences. This patch introduces a common function for reading files from the kernel with the corresponding security post-read hook and function. Changelog v4+: - export security_kernel_post_read_file() - Fengguang Wu v3: - additional bounds checking - Luis v2: - To simplify patch review, re-ordered patches Signed-off-by: Mimi Zohar Reviewed-by: Luis R. Rodriguez Acked-by: Kees Cook Cc: Al Viro --- include/linux/security.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux/security.h') diff --git a/include/linux/security.h b/include/linux/security.h index 4824a4ccaf1c..f30f5647d1e1 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -301,6 +301,7 @@ int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_fw_from_file(struct file *file, char *buf, size_t size); int security_kernel_module_request(char *kmod_name); int security_kernel_module_from_file(struct file *file); +int security_kernel_post_read_file(struct file *file, char *buf, loff_t size); int security_task_fix_setuid(struct cred *new, const struct cred *old, int flags); int security_task_setpgid(struct task_struct *p, pid_t pgid); @@ -866,6 +867,12 @@ static inline int security_kernel_module_from_file(struct file *file) return 0; } +static inline int security_kernel_post_read_file(struct file *file, + char *buf, loff_t size) +{ + return 0; +} + static inline int security_task_fix_setuid(struct cred *new, const struct cred *old, int flags) -- cgit v1.2.3