summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorThomas Cedeno <thomascedeno@google.com>2020-06-09 19:22:13 +0200
committerMicah Morton <mortonm@chromium.org>2020-06-14 19:52:02 +0200
commit39030e1351aa1aa7443bb2da24426573077c83da (patch)
treef593d47dfb088f59bf3db1ce3be5ddc475af6218 /include
parentLinux 5.7 (diff)
downloadlinux-39030e1351aa1aa7443bb2da24426573077c83da.tar.xz
linux-39030e1351aa1aa7443bb2da24426573077c83da.zip
security: Add LSM hooks to set*gid syscalls
The SafeSetID LSM uses the security_task_fix_setuid hook to filter set*uid() syscalls according to its configured security policy. In preparation for adding analagous support in the LSM for set*gid() syscalls, we add the requisite hook here. Tested by putting print statements in the security_task_fix_setgid hook and seeing them get hit during kernel boot. Signed-off-by: Thomas Cedeno <thomascedeno@google.com> Signed-off-by: Micah Morton <mortonm@chromium.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/lsm_hook_defs.h2
-rw-r--r--include/linux/lsm_hooks.h9
-rw-r--r--include/linux/security.h9
3 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 5616b2567aa7..2a5a53a83ecb 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -190,6 +190,8 @@ LSM_HOOK(int, 0, kernel_post_read_file, struct file *file, char *buf,
loff_t size, enum kernel_read_file_id id)
LSM_HOOK(int, 0, task_fix_setuid, struct cred *new, const struct cred *old,
int flags)
+LSM_HOOK(int, 0, task_fix_setgid, struct cred *new, const struct cred * old,
+ int flags)
LSM_HOOK(int, 0, task_setpgid, struct task_struct *p, pid_t pgid)
LSM_HOOK(int, 0, task_getpgid, struct task_struct *p)
LSM_HOOK(int, 0, task_getsid, struct task_struct *p)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 988ca0df7824..b20132bcea2d 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -651,6 +651,15 @@
* @old is the set of credentials that are being replaces
* @flags contains one of the LSM_SETID_* values.
* Return 0 on success.
+ * @task_fix_setgid:
+ * Update the module's state after setting one or more of the group
+ * identity attributes of the current process. The @flags parameter
+ * indicates which of the set*gid system calls invoked this hook.
+ * @new is the set of credentials that will be installed. Modifications
+ * should be made to this rather than to @current->cred.
+ * @old is the set of credentials that are being replaced.
+ * @flags contains one of the LSM_SETID_* values.
+ * Return 0 on success.
* @task_setpgid:
* Check permission before setting the process group identifier of the
* process @p to @pgid.
diff --git a/include/linux/security.h b/include/linux/security.h
index a8d9310472df..88749bf0d1d7 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -389,6 +389,8 @@ int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
enum kernel_read_file_id id);
int security_task_fix_setuid(struct cred *new, const struct cred *old,
int flags);
+int security_task_fix_setgid(struct cred *new, const struct cred *old,
+ int flags);
int security_task_setpgid(struct task_struct *p, pid_t pgid);
int security_task_getpgid(struct task_struct *p);
int security_task_getsid(struct task_struct *p);
@@ -1027,6 +1029,13 @@ static inline int security_task_fix_setuid(struct cred *new,
return cap_task_fix_setuid(new, old, flags);
}
+static inline int security_task_fix_setgid(struct cred *new,
+ const struct cred *old,
+ int flags)
+{
+ return 0;
+}
+
static inline int security_task_setpgid(struct task_struct *p, pid_t pgid)
{
return 0;