path: root/security
diff options
authorMimi Zohar <zohar@linux.vnet.ibm.com>2015-12-28 16:02:29 -0500
committerMimi Zohar <zohar@linux.vnet.ibm.com>2016-02-18 17:14:03 -0500
commitb44a7dfc6fa16e01f2497c9fa62c3926f94be174 (patch)
treeb48ced5b7c84986778ca4ac3b6bf3f13c74f2ef2 /security
parentfirmware: clean up filesystem load exit path (diff)
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 <zohar@linux.vnet.ibm.com> Reviewed-by: Luis R. Rodriguez <mcgrof@suse.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'security')
1 files changed, 8 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index e8ffd92ae2eb..c98dd6bf4ebd 100644
--- a/security/security.c
+++ b/security/security.c
@@ -910,6 +910,12 @@ int security_kernel_module_from_file(struct file *file)
return ima_module_check(file);
+int security_kernel_post_read_file(struct file *file, char *buf, loff_t size)
+ return call_int_hook(kernel_post_read_file, 0, file, buf, size);
int security_task_fix_setuid(struct cred *new, const struct cred *old,
int flags)
@@ -1697,6 +1703,8 @@ struct security_hook_heads security_hook_heads = {
.kernel_module_from_file =
+ .kernel_post_read_file =
+ LIST_HEAD_INIT(security_hook_heads.kernel_post_read_file),
.task_fix_setuid =
.task_setpgid = LIST_HEAD_INIT(security_hook_heads.task_setpgid),