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lsm: constify the 'target' parameter in security_capget()

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Three LSMs register the implementations for the "capget" hook: AppArmor,
SELinux, and the normal capability code. Looking at the function
implementations we may observe that the first parameter "target" is not
changing.

Mark the first argument "target" of LSM hook security_capget() as
"const" since it will not be changing in the LSM hook.

cap_capget() LSM hook declaration exceeds the 80 characters per line
limit. Split the function declaration to multiple lines to decrease the
line length.

Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
Acked-by: John Johansen <john.johansen@canonical.com>
[PM: align the cap_capget() declaration, spelling fixes]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Khadija Kamran 2023-08-07 11:59:29 +05:00 committed by Paul Moore
parent bd1f5934e4
commit 6672efbb68
7 changed files with 10 additions and 9 deletions
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2
include/linux/lsm_hook_defs.h
View File

@ -36,7 +36,7 @@ LSM_HOOK(int, 0, binder_transfer_file, const struct cred *from,
LSM_HOOK(int, 0, ptrace_access_check, struct task_struct *child,
unsigned int mode)
LSM_HOOK(int, 0, ptrace_traceme, struct task_struct *parent)
LSM_HOOK(int, 0, capget, struct task_struct *target, kernel_cap_t *effective,
LSM_HOOK(int, 0, capget, const struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
LSM_HOOK(int, 0, capset, struct cred *new, const struct cred *old,
const kernel_cap_t *effective, const kernel_cap_t *inheritable,

7
include/linux/security.h
View File

@ -145,7 +145,8 @@ extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
extern int cap_settime(const struct timespec64 *ts, const struct timezone *tz);
extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);
extern int cap_ptrace_traceme(struct task_struct *parent);
extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
extern int cap_capget(const struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted);
extern int cap_capset(struct cred *new, const struct cred *old,
const kernel_cap_t *effective,
const kernel_cap_t *inheritable,
@ -271,7 +272,7 @@ int security_binder_transfer_file(const struct cred *from,
const struct cred *to, struct file *file);
int security_ptrace_access_check(struct task_struct *child, unsigned int mode);
int security_ptrace_traceme(struct task_struct *parent);
int security_capget(struct task_struct *target,
int security_capget(const struct task_struct *target,
kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted);
@ -553,7 +554,7 @@ static inline int security_ptrace_traceme(struct task_struct *parent)
return cap_ptrace_traceme(parent);
}
static inline int security_capget(struct task_struct *target,
static inline int security_capget(const struct task_struct *target,
kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted)

2
kernel/capability.c
View File

@ -112,7 +112,7 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
int ret;
if (pid && (pid != task_pid_vnr(current))) {
struct task_struct *target;
const struct task_struct *target;
rcu_read_lock();

2
security/apparmor/lsm.c
View File

@ -144,7 +144,7 @@ static int apparmor_ptrace_traceme(struct task_struct *parent)
}
/* Derived from security/commoncap.c:cap_capget */
static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
static int apparmor_capget(const struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
struct aa_label *label;

2
security/commoncap.c
View File

@ -197,7 +197,7 @@ out:
* This function retrieves the capabilities of the nominated task and returns
* them to the caller.
*/
int cap_capget(struct task_struct *target, kernel_cap_t *effective,
int cap_capget(const struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
const struct cred *cred;

2
security/security.c
View File

@ -894,7 +894,7 @@ int security_ptrace_traceme(struct task_struct *parent)
*
* Return: Returns 0 if the capability sets were successfully obtained.
*/
int security_capget(struct task_struct *target,
int security_capget(const struct task_struct *target,
kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted)

2
security/selinux/hooks.c
View File

@ -2082,7 +2082,7 @@ static int selinux_ptrace_traceme(struct task_struct *parent)
SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
}
static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
static int selinux_capget(const struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
return avc_has_perm(current_sid(), task_sid_obj(target),