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Diffstat (limited to 'kernel/capability.c')
-rw-r--r--kernel/capability.c200
1 files changed, 99 insertions, 101 deletions
diff --git a/kernel/capability.c b/kernel/capability.c
index 4e350a36ed6..efbd9cdce13 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -3,20 +3,18 @@
*
* Copyright (C) 1997 Andrew Main <zefram@fysh.org>
*
- * Integrated into 2.1.97+, Andrew G. Morgan <morgan@transmeta.com>
+ * Integrated into 2.1.97+, Andrew G. Morgan <morgan@kernel.org>
* 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
- */
+ */
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/security.h>
#include <linux/syscalls.h>
+#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
-unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
-kernel_cap_t cap_bset = CAP_INIT_EFF_SET;
-
/*
* This lock protects task->cap_* for all tasks including current.
* Locking rule: acquire this prior to tasklist_lock.
@@ -40,49 +38,49 @@ static DEFINE_SPINLOCK(task_capability_lock);
*/
asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
{
- int ret = 0;
- pid_t pid;
- __u32 version;
- struct task_struct *target;
- struct __user_cap_data_struct data;
-
- if (get_user(version, &header->version))
- return -EFAULT;
-
- if (version != _LINUX_CAPABILITY_VERSION) {
- if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
- return -EFAULT;
- return -EINVAL;
- }
+ int ret = 0;
+ pid_t pid;
+ __u32 version;
+ struct task_struct *target;
+ struct __user_cap_data_struct data;
+
+ if (get_user(version, &header->version))
+ return -EFAULT;
+
+ if (version != _LINUX_CAPABILITY_VERSION) {
+ if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
+ return -EFAULT;
+ return -EINVAL;
+ }
- if (get_user(pid, &header->pid))
- return -EFAULT;
+ if (get_user(pid, &header->pid))
+ return -EFAULT;
- if (pid < 0)
- return -EINVAL;
+ if (pid < 0)
+ return -EINVAL;
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
+ spin_lock(&task_capability_lock);
+ read_lock(&tasklist_lock);
- if (pid && pid != current->pid) {
- target = find_task_by_pid(pid);
- if (!target) {
- ret = -ESRCH;
- goto out;
- }
- } else
- target = current;
+ if (pid && pid != task_pid_vnr(current)) {
+ target = find_task_by_vpid(pid);
+ if (!target) {
+ ret = -ESRCH;
+ goto out;
+ }
+ } else
+ target = current;
- ret = security_capget(target, &data.effective, &data.inheritable, &data.permitted);
+ ret = security_capget(target, &data.effective, &data.inheritable, &data.permitted);
out:
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
+ read_unlock(&tasklist_lock);
+ spin_unlock(&task_capability_lock);
- if (!ret && copy_to_user(dataptr, &data, sizeof data))
- return -EFAULT;
+ if (!ret && copy_to_user(dataptr, &data, sizeof data))
+ return -EFAULT;
- return ret;
+ return ret;
}
/*
@@ -98,7 +96,7 @@ static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
int found = 0;
struct pid *pgrp;
- pgrp = find_pid(pgrp_nr);
+ pgrp = find_vpid(pgrp_nr);
do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
target = g;
while_each_thread(g, target) {
@@ -115,7 +113,7 @@ static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
} while_each_pid_task(pgrp, PIDTYPE_PGID, g);
if (!found)
- ret = 0;
+ ret = 0;
return ret;
}
@@ -132,7 +130,7 @@ static inline int cap_set_all(kernel_cap_t *effective,
int found = 0;
do_each_thread(g, target) {
- if (target == current || is_init(target))
+ if (target == current || is_container_init(target->group_leader))
continue;
found = 1;
if (security_capset_check(target, effective, inheritable,
@@ -169,68 +167,68 @@ static inline int cap_set_all(kernel_cap_t *effective,
*/
asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
{
- kernel_cap_t inheritable, permitted, effective;
- __u32 version;
- struct task_struct *target;
- int ret;
- pid_t pid;
-
- if (get_user(version, &header->version))
- return -EFAULT;
-
- if (version != _LINUX_CAPABILITY_VERSION) {
- if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
- return -EFAULT;
- return -EINVAL;
- }
-
- if (get_user(pid, &header->pid))
- return -EFAULT;
-
- if (pid && pid != current->pid && !capable(CAP_SETPCAP))
- return -EPERM;
-
- if (copy_from_user(&effective, &data->effective, sizeof(effective)) ||
- copy_from_user(&inheritable, &data->inheritable, sizeof(inheritable)) ||
- copy_from_user(&permitted, &data->permitted, sizeof(permitted)))
- return -EFAULT;
-
- spin_lock(&task_capability_lock);
- read_lock(&tasklist_lock);
-
- if (pid > 0 && pid != current->pid) {
- target = find_task_by_pid(pid);
- if (!target) {
- ret = -ESRCH;
- goto out;
- }
- } else
- target = current;
-
- ret = 0;
-
- /* having verified that the proposed changes are legal,
- we now put them into effect. */
- if (pid < 0) {
- if (pid == -1) /* all procs other than current and init */
- ret = cap_set_all(&effective, &inheritable, &permitted);
-
- else /* all procs in process group */
- ret = cap_set_pg(-pid, &effective, &inheritable,
- &permitted);
- } else {
- ret = security_capset_check(target, &effective, &inheritable,
- &permitted);
- if (!ret)
- security_capset_set(target, &effective, &inheritable,
- &permitted);
- }
+ kernel_cap_t inheritable, permitted, effective;
+ __u32 version;
+ struct task_struct *target;
+ int ret;
+ pid_t pid;
+
+ if (get_user(version, &header->version))
+ return -EFAULT;
+
+ if (version != _LINUX_CAPABILITY_VERSION) {
+ if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
+ return -EFAULT;
+ return -EINVAL;
+ }
+
+ if (get_user(pid, &header->pid))
+ return -EFAULT;
+
+ if (pid && pid != task_pid_vnr(current) && !capable(CAP_SETPCAP))
+ return -EPERM;
+
+ if (copy_from_user(&effective, &data->effective, sizeof(effective)) ||
+ copy_from_user(&inheritable, &data->inheritable, sizeof(inheritable)) ||
+ copy_from_user(&permitted, &data->permitted, sizeof(permitted)))
+ return -EFAULT;
+
+ spin_lock(&task_capability_lock);
+ read_lock(&tasklist_lock);
+
+ if (pid > 0 && pid != task_pid_vnr(current)) {
+ target = find_task_by_vpid(pid);
+ if (!target) {
+ ret = -ESRCH;
+ goto out;
+ }
+ } else
+ target = current;
+
+ ret = 0;
+
+ /* having verified that the proposed changes are legal,
+ we now put them into effect. */
+ if (pid < 0) {
+ if (pid == -1) /* all procs other than current and init */
+ ret = cap_set_all(&effective, &inheritable, &permitted);
+
+ else /* all procs in process group */
+ ret = cap_set_pg(-pid, &effective, &inheritable,
+ &permitted);
+ } else {
+ ret = security_capset_check(target, &effective, &inheritable,
+ &permitted);
+ if (!ret)
+ security_capset_set(target, &effective, &inheritable,
+ &permitted);
+ }
out:
- read_unlock(&tasklist_lock);
- spin_unlock(&task_capability_lock);
+ read_unlock(&tasklist_lock);
+ spin_unlock(&task_capability_lock);
- return ret;
+ return ret;
}
int __capable(struct task_struct *t, int cap)
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 20:13:02 +0000