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| author | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2015-12-29 00:02:29 +0300 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2016-02-19 01:14:03 +0300 |
| commit | b44a7dfc6fa16e01f2497c9fa62c3926f94be174 (patch) | |
| tree | b48ced5b7c84986778ca4ac3b6bf3f13c74f2ef2 /security/security.c | |
| parent | 4b2530d819e179ae3352c38a1ceff929a922d070 (diff) | |
| download | linux-b44a7dfc6fa16e01f2497c9fa62c3926f94be174.tar.xz | |
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/security.c')
| -rw-r--r-- | security/security.c | 8 |
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); +} +EXPORT_SYMBOL_GPL(security_kernel_post_read_file); + 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 = { LIST_HEAD_INIT(security_hook_heads.kernel_module_request), .kernel_module_from_file = LIST_HEAD_INIT(security_hook_heads.kernel_module_from_file), + .kernel_post_read_file = + LIST_HEAD_INIT(security_hook_heads.kernel_post_read_file), .task_fix_setuid = LIST_HEAD_INIT(security_hook_heads.task_fix_setuid), .task_setpgid = LIST_HEAD_INIT(security_hook_heads.task_setpgid), |