CRED: Use RCU to access another task's creds and to release a task's own creds
Use RCU to access another task's creds and to release a task's own creds.
This means that it will be possible for the credentials of a task to be
replaced without another task (a) requiring a full lock to read them, and (b)
seeing deallocated memory.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 62fe9b2..7e4877d 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -159,6 +159,7 @@
struct group_info *group_info;
int g;
struct fdtable *fdt = NULL;
+ const struct cred *cred;
pid_t ppid, tpid;
rcu_read_lock();
@@ -170,6 +171,7 @@
if (tracer)
tpid = task_pid_nr_ns(tracer, ns);
}
+ cred = get_cred((struct cred *) __task_cred(p));
seq_printf(m,
"State:\t%s\n"
"Tgid:\t%d\n"
@@ -182,8 +184,8 @@
task_tgid_nr_ns(p, ns),
pid_nr_ns(pid, ns),
ppid, tpid,
- p->cred->uid, p->cred->euid, p->cred->suid, p->cred->fsuid,
- p->cred->gid, p->cred->egid, p->cred->sgid, p->cred->fsgid);
+ cred->uid, cred->euid, cred->suid, cred->fsuid,
+ cred->gid, cred->egid, cred->sgid, cred->fsgid);
task_lock(p);
if (p->files)
@@ -194,13 +196,12 @@
fdt ? fdt->max_fds : 0);
rcu_read_unlock();
- group_info = p->cred->group_info;
- get_group_info(group_info);
+ group_info = cred->group_info;
task_unlock(p);
for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
seq_printf(m, "%d ", GROUP_AT(group_info, g));
- put_group_info(group_info);
+ put_cred(cred);
seq_printf(m, "\n");
}
@@ -262,7 +263,7 @@
blocked = p->blocked;
collect_sigign_sigcatch(p, &ignored, &caught);
num_threads = atomic_read(&p->signal->count);
- qsize = atomic_read(&p->cred->user->sigpending);
+ qsize = atomic_read(&__task_cred(p)->user->sigpending);
qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
unlock_task_sighand(p, &flags);
}
@@ -293,12 +294,21 @@
static inline void task_cap(struct seq_file *m, struct task_struct *p)
{
- struct cred *cred = p->cred;
+ const struct cred *cred;
+ kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
- render_cap_t(m, "CapInh:\t", &cred->cap_inheritable);
- render_cap_t(m, "CapPrm:\t", &cred->cap_permitted);
- render_cap_t(m, "CapEff:\t", &cred->cap_effective);
- render_cap_t(m, "CapBnd:\t", &cred->cap_bset);
+ rcu_read_lock();
+ cred = __task_cred(p);
+ cap_inheritable = cred->cap_inheritable;
+ cap_permitted = cred->cap_permitted;
+ cap_effective = cred->cap_effective;
+ cap_bset = cred->cap_bset;
+ rcu_read_unlock();
+
+ render_cap_t(m, "CapInh:\t", &cap_inheritable);
+ render_cap_t(m, "CapPrm:\t", &cap_permitted);
+ render_cap_t(m, "CapEff:\t", &cap_effective);
+ render_cap_t(m, "CapBnd:\t", &cap_bset);
}
static inline void task_context_switch_counts(struct seq_file *m,
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6862b36..cf42c42 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1406,6 +1406,7 @@
{
struct inode * inode;
struct proc_inode *ei;
+ const struct cred *cred;
/* We need a new inode */
@@ -1428,8 +1429,11 @@
inode->i_uid = 0;
inode->i_gid = 0;
if (task_dumpable(task)) {
- inode->i_uid = task->cred->euid;
- inode->i_gid = task->cred->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
}
security_task_to_inode(task, inode);
@@ -1445,6 +1449,8 @@
{
struct inode *inode = dentry->d_inode;
struct task_struct *task;
+ const struct cred *cred;
+
generic_fillattr(inode, stat);
rcu_read_lock();
@@ -1454,8 +1460,9 @@
if (task) {
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
task_dumpable(task)) {
- stat->uid = task->cred->euid;
- stat->gid = task->cred->egid;
+ cred = __task_cred(task);
+ stat->uid = cred->euid;
+ stat->gid = cred->egid;
}
}
rcu_read_unlock();
@@ -1483,11 +1490,16 @@
{
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
+ const struct cred *cred;
+
if (task) {
if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
task_dumpable(task)) {
- inode->i_uid = task->cred->euid;
- inode->i_gid = task->cred->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
} else {
inode->i_uid = 0;
inode->i_gid = 0;
@@ -1649,6 +1661,7 @@
struct task_struct *task = get_proc_task(inode);
int fd = proc_fd(inode);
struct files_struct *files;
+ const struct cred *cred;
if (task) {
files = get_files_struct(task);
@@ -1658,8 +1671,11 @@
rcu_read_unlock();
put_files_struct(files);
if (task_dumpable(task)) {
- inode->i_uid = task->cred->euid;
- inode->i_gid = task->cred->egid;
+ rcu_read_lock();
+ cred = __task_cred(task);
+ inode->i_uid = cred->euid;
+ inode->i_gid = cred->egid;
+ rcu_read_unlock();
} else {
inode->i_uid = 0;
inode->i_gid = 0;