diff options
author | Eric Paris <eparis@redhat.com> | 2009-08-13 09:44:57 -0400 |
---|---|---|
committer | James Morris <jmorris@namei.org> | 2009-08-13 21:18:37 -0400 |
commit | 9188499cdb117d86a1ea6b04374095b098d56936 (patch) | |
tree | 7c0dd23f2c98630c426cbd0bfbf5e46cc689091e /include | |
parent | a8f80e8ff94ecba629542d9b4b5f5a8ee3eb565c (diff) |
security: introducing security_request_module
Calling request_module() will trigger a userspace upcall which will load a
new module into the kernel. This can be a dangerous event if the process
able to trigger request_module() is able to control either the modprobe
binary or the module binary. This patch adds a new security hook to
request_module() which can be used by an LSM to control a processes ability
to call request_module().
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/security.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/security.h b/include/linux/security.h index 57ead99d2593..1e3dd86eea99 100644 --- a/include/linux/security.h +++ b/include/linux/security.h | |||
@@ -678,6 +678,9 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) | |||
678 | * @inode points to the inode to use as a reference. | 678 | * @inode points to the inode to use as a reference. |
679 | * The current task must be the one that nominated @inode. | 679 | * The current task must be the one that nominated @inode. |
680 | * Return 0 if successful. | 680 | * Return 0 if successful. |
681 | * @kernel_module_request: | ||
682 | * Ability to trigger the kernel to automatically upcall to userspace for | ||
683 | * userspace to load a kernel module with the given name. | ||
681 | * @task_setuid: | 684 | * @task_setuid: |
682 | * Check permission before setting one or more of the user identity | 685 | * Check permission before setting one or more of the user identity |
683 | * attributes of the current process. The @flags parameter indicates | 686 | * attributes of the current process. The @flags parameter indicates |
@@ -1489,6 +1492,7 @@ struct security_operations { | |||
1489 | void (*cred_commit)(struct cred *new, const struct cred *old); | 1492 | void (*cred_commit)(struct cred *new, const struct cred *old); |
1490 | int (*kernel_act_as)(struct cred *new, u32 secid); | 1493 | int (*kernel_act_as)(struct cred *new, u32 secid); |
1491 | int (*kernel_create_files_as)(struct cred *new, struct inode *inode); | 1494 | int (*kernel_create_files_as)(struct cred *new, struct inode *inode); |
1495 | int (*kernel_module_request)(void); | ||
1492 | int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags); | 1496 | int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags); |
1493 | int (*task_fix_setuid) (struct cred *new, const struct cred *old, | 1497 | int (*task_fix_setuid) (struct cred *new, const struct cred *old, |
1494 | int flags); | 1498 | int flags); |
@@ -1741,6 +1745,7 @@ int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); | |||
1741 | void security_commit_creds(struct cred *new, const struct cred *old); | 1745 | void security_commit_creds(struct cred *new, const struct cred *old); |
1742 | int security_kernel_act_as(struct cred *new, u32 secid); | 1746 | int security_kernel_act_as(struct cred *new, u32 secid); |
1743 | int security_kernel_create_files_as(struct cred *new, struct inode *inode); | 1747 | int security_kernel_create_files_as(struct cred *new, struct inode *inode); |
1748 | int security_kernel_module_request(void); | ||
1744 | int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags); | 1749 | int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags); |
1745 | int security_task_fix_setuid(struct cred *new, const struct cred *old, | 1750 | int security_task_fix_setuid(struct cred *new, const struct cred *old, |
1746 | int flags); | 1751 | int flags); |
@@ -2292,6 +2297,11 @@ static inline int security_kernel_create_files_as(struct cred *cred, | |||
2292 | return 0; | 2297 | return 0; |
2293 | } | 2298 | } |
2294 | 2299 | ||
2300 | static inline int security_kernel_module_request(void) | ||
2301 | { | ||
2302 | return 0; | ||
2303 | } | ||
2304 | |||
2295 | static inline int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, | 2305 | static inline int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, |
2296 | int flags) | 2306 | int flags) |
2297 | { | 2307 | { |