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CRED: Use RCU to access another task's creds and to release a task's own creds

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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>
This commit is contained in:
David Howells 2008-11-14 10:39:19 +11:00 committed by James Morris
parent 86a264abe5
commit c69e8d9c01
28 changed files with 353 additions and 202 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/ia64/kernel/perfmon.c
View File

@ -2399,25 +2399,33 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
static int
pfm_bad_permissions(struct task_struct *task)
{
const struct cred *tcred;
uid_t uid = current_uid();
gid_t gid = current_gid();
int ret;
rcu_read_lock();
tcred = __task_cred(task);
/* inspired by ptrace_attach() */
DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
uid,
gid,
task->euid,
task->suid,
task->uid,
task->egid,
task->sgid));
tcred->euid,
tcred->suid,
tcred->uid,
tcred->egid,
tcred->sgid));
return (uid != task->euid)
|| (uid != task->suid)
|| (uid != task->uid)
|| (gid != task->egid)
|| (gid != task->sgid)
|| (gid != task->gid)) && !capable(CAP_SYS_PTRACE);
ret = ((uid != tcred->euid)
|| (uid != tcred->suid)
|| (uid != tcred->uid)
|| (gid != tcred->egid)
|| (gid != tcred->sgid)
|| (gid != tcred->gid)) && !capable(CAP_SYS_PTRACE);
rcu_read_unlock();
return ret;
}
static int

16
drivers/connector/cn_proc.c
View File

@ -106,6 +106,7 @@ void proc_id_connector(struct task_struct *task, int which_id)
struct proc_event *ev;
__u8 buffer[CN_PROC_MSG_SIZE];
struct timespec ts;
const struct cred *cred;
if (atomic_read(&proc_event_num_listeners) < 1)
return;
@ -115,14 +116,19 @@ void proc_id_connector(struct task_struct *task, int which_id)
ev->what = which_id;
ev->event_data.id.process_pid = task->pid;
ev->event_data.id.process_tgid = task->tgid;
rcu_read_lock();
cred = __task_cred(task);
if (which_id == PROC_EVENT_UID) {
ev->event_data.id.r.ruid = task->cred->uid;
ev->event_data.id.e.euid = task->cred->euid;
ev->event_data.id.r.ruid = cred->uid;
ev->event_data.id.e.euid = cred->euid;
} else if (which_id == PROC_EVENT_GID) {
ev->event_data.id.r.rgid = task->cred->gid;
ev->event_data.id.e.egid = task->cred->egid;
} else
ev->event_data.id.r.rgid = cred->gid;
ev->event_data.id.e.egid = cred->egid;
} else {
rcu_read_unlock();
return;
}
rcu_read_unlock();
get_seq(&msg->seq, &ev->cpu);
ktime_get_ts(&ts); /* get high res monotonic timestamp */
put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);

8
fs/binfmt_elf.c
View File

@ -1361,6 +1361,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct mm_struct *mm)
{
const struct cred *cred;
unsigned int i, len;
/* first copy the parameters from user space */
@ -1388,8 +1389,11 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
psinfo->pr_nice = task_nice(p);
psinfo->pr_flag = p->flags;
SET_UID(psinfo->pr_uid, p->cred->uid);
SET_GID(psinfo->pr_gid, p->cred->gid);
rcu_read_lock();
cred = __task_cred(p);
SET_UID(psinfo->pr_uid, cred->uid);
SET_GID(psinfo->pr_gid, cred->gid);
rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;

8
fs/binfmt_elf_fdpic.c
View File

@ -1414,6 +1414,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct mm_struct *mm)
{
const struct cred *cred;
unsigned int i, len;
/* first copy the parameters from user space */
@ -1441,8 +1442,11 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
psinfo->pr_nice = task_nice(p);
psinfo->pr_flag = p->flags;
SET_UID(psinfo->pr_uid, p->cred->uid);
SET_GID(psinfo->pr_gid, p->cred->gid);
rcu_read_lock();
cred = __task_cred(p);
SET_UID(psinfo->pr_uid, cred->uid);
SET_GID(psinfo->pr_gid, cred->gid);
rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;

15
fs/fcntl.c
View File

@ -401,10 +401,17 @@ static const long band_table[NSIGPOLL] = {
static inline int sigio_perm(struct task_struct *p,
struct fown_struct *fown, int sig)
{
return (((fown->euid == 0) ||
(fown->euid == p->cred->suid) || (fown->euid == p->cred->uid) ||
(fown->uid == p->cred->suid) || (fown->uid == p->cred->uid)) &&
!security_file_send_sigiotask(p, fown, sig));
const struct cred *cred;
int ret;
rcu_read_lock();
cred = __task_cred(p);
ret = ((fown->euid == 0 ||
fown->euid == cred->suid || fown->euid == cred->uid ||
fown->uid == cred->suid || fown->uid == cred->uid) &&
!security_file_send_sigiotask(p, fown, sig));
rcu_read_unlock();
return ret;
}
static void send_sigio_to_task(struct task_struct *p,

23
fs/fuse/dir.c
View File

@ -869,18 +869,25 @@ int fuse_update_attributes(struct inode *inode, struct kstat *stat,
*/
int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
{
const struct cred *cred;
int ret;
if (fc->flags & FUSE_ALLOW_OTHER)
return 1;
if (task->cred->euid == fc->user_id &&
task->cred->suid == fc->user_id &&
task->cred->uid == fc->user_id &&
task->cred->egid == fc->group_id &&
task->cred->sgid == fc->group_id &&
task->cred->gid == fc->group_id)
return 1;
rcu_read_lock();
ret = 0;
cred = __task_cred(task);
if (cred->euid == fc->user_id &&
cred->suid == fc->user_id &&
cred->uid == fc->user_id &&
cred->egid == fc->group_id &&
cred->sgid == fc->group_id &&
cred->gid == fc->group_id)
ret = 1;
rcu_read_unlock();
return 0;
return ret;
}
static int fuse_access(struct inode *inode, int mask)

14
fs/ioprio.c
View File

@ -31,10 +31,16 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
{
int err;
struct io_context *ioc;
const struct cred *cred = current_cred(), *tcred;
if (task->cred->uid != current_euid() &&
task->cred->uid != current_uid() && !capable(CAP_SYS_NICE))
rcu_read_lock();
tcred = __task_cred(task);
if (tcred->uid != cred->euid &&
tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
rcu_read_unlock();
return -EPERM;
}
rcu_read_unlock();
err = security_task_setioprio(task, ioprio);
if (err)
@ -131,7 +137,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
break;
do_each_thread(g, p) {
if (p->cred->uid != who)
if (__task_cred(p)->uid != who)
continue;
ret = set_task_ioprio(p, ioprio);
if (ret)
@ -224,7 +230,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
break;
do_each_thread(g, p) {
if (p->cred->uid != user->uid)
if (__task_cred(p)->uid != user->uid)
continue;
tmpio = get_task_ioprio(p);
if (tmpio < 0)

32
fs/proc/array.c
View File

@ -159,6 +159,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
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 void render_cap_t(struct seq_file *m, const char *header,
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,

32
fs/proc/base.c
View File

@ -1406,6 +1406,7 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
{
struct inode * inode;
struct proc_inode *ei;
const struct cred *cred;
/* We need a new inode */
@ -1428,8 +1429,11 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
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 @@ static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
{
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 @@ static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
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 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
{
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 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
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 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
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;

3
include/linux/cred.h
View File

@ -147,8 +147,9 @@ static inline struct cred *get_cred(struct cred *cred)
* Release a reference to a set of credentials, deleting them when the last ref
* is released.
*/
static inline void put_cred(struct cred *cred)
static inline void put_cred(const struct cred *_cred)
{
struct cred *cred = (struct cred *) _cred;
if (atomic_dec_and_test(&(cred)->usage))
__put_cred(cred);
}

33
kernel/auditsc.c
View File

@ -447,7 +447,7 @@ static int audit_filter_rules(struct task_struct *tsk,
struct audit_names *name,
enum audit_state *state)
{
struct cred *cred = tsk->cred;
const struct cred *cred = get_task_cred(tsk);
int i, j, need_sid = 1;
u32 sid;
@ -642,8 +642,10 @@ static int audit_filter_rules(struct task_struct *tsk,
break;
}
if (!result)
if (!result) {
put_cred(cred);
return 0;
}
}
if (rule->filterkey && ctx)
ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@ -651,6 +653,7 @@ static int audit_filter_rules(struct task_struct *tsk,
case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
}
put_cred(cred);
return 1;
}
@ -1229,7 +1232,7 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
struct cred *cred = tsk->cred;
const struct cred *cred;
int i, call_panic = 0;
struct audit_buffer *ab;
struct audit_aux_data *aux;
@ -1239,13 +1242,14 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->pid = tsk->pid;
if (!context->ppid)
context->ppid = sys_getppid();
context->uid = cred->uid;
context->gid = cred->gid;
context->euid = cred->euid;
context->suid = cred->suid;
cred = current_cred();
context->uid = cred->uid;
context->gid = cred->gid;
context->euid = cred->euid;
context->suid = cred->suid;
context->fsuid = cred->fsuid;
context->egid = cred->egid;
context->sgid = cred->sgid;
context->egid = cred->egid;
context->sgid = cred->sgid;
context->fsgid = cred->fsgid;
context->personality = tsk->personality;
@ -2088,7 +2092,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
task->pid, task->cred->uid,
task->pid, task_uid(task),
task->loginuid, loginuid,
task->sessionid, sessionid);
audit_log_end(ab);
@ -2471,7 +2475,7 @@ void __audit_ptrace(struct task_struct *t)
context->target_pid = t->pid;
context->target_auid = audit_get_loginuid(t);
context->target_uid = t->cred->uid;
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &context->target_sid);
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@ -2490,6 +2494,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
struct audit_aux_data_pids *axp;
struct task_struct *tsk = current;
struct audit_context *ctx = tsk->audit_context;
uid_t uid = current_uid(), t_uid = task_uid(t);
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@ -2497,7 +2502,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (tsk->loginuid != -1)
audit_sig_uid = tsk->loginuid;
else
audit_sig_uid = tsk->cred->uid;
audit_sig_uid = uid;
security_task_getsecid(tsk, &audit_sig_sid);
}
if (!audit_signals || audit_dummy_context())
@ -2509,7 +2514,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (!ctx->target_pid) {
ctx->target_pid = t->tgid;
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t->cred->uid;
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &ctx->target_sid);
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@ -2530,7 +2535,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
axp->target_pid[axp->pid_count] = t->tgid;
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
axp->target_uid[axp->pid_count] = t->cred->uid;
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);

16
kernel/cgroup.c
View File

@ -1279,7 +1279,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
{
struct task_struct *tsk;
uid_t euid;
const struct cred *cred = current_cred(), *tcred;
int ret;
if (pid) {
@ -1289,16 +1289,16 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
rcu_read_unlock();
return -ESRCH;
}
get_task_struct(tsk);
rcu_read_unlock();
euid = current_euid();
if (euid &&
euid != tsk->cred->uid &&
euid != tsk->cred->suid) {
put_task_struct(tsk);
tcred = __task_cred(tsk);
if (cred->euid &&
cred->euid != tcred->uid &&
cred->euid != tcred->suid) {
rcu_read_unlock();
return -EACCES;
}
get_task_struct(tsk);
rcu_read_unlock();
} else {
tsk = current;
get_task_struct(tsk);

14
kernel/exit.c
View File

@ -160,7 +160,10 @@ void release_task(struct task_struct * p)
int zap_leader;
repeat:
tracehook_prepare_release_task(p);
atomic_dec(&p->cred->user->processes);
/* don't need to get the RCU readlock here - the process is dead and
* can't be modifying its own credentials */
atomic_dec(&__task_cred(p)->user->processes);
proc_flush_task(p);
write_lock_irq(&tasklist_lock);
tracehook_finish_release_task(p);
@ -1267,12 +1270,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
unsigned long state;
int retval, status, traced;
pid_t pid = task_pid_vnr(p);
uid_t uid = __task_cred(p)->uid;
if (!likely(options & WEXITED))
return 0;
if (unlikely(options & WNOWAIT)) {
uid_t uid = p->cred->uid;
int exit_code = p->exit_code;
int why, status;
@ -1393,7 +1396,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
if (!retval && infop)
retval = put_user(pid, &infop->si_pid);
if (!retval && infop)
retval = put_user(p->cred->uid, &infop->si_uid);
retval = put_user(uid, &infop->si_uid);
if (!retval)
retval = pid;
@ -1458,7 +1461,8 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
if (!unlikely(options & WNOWAIT))
p->exit_code = 0;
uid = p->cred->uid;
/* don't need the RCU readlock here as we're holding a spinlock */
uid = __task_cred(p)->uid;
unlock_sig:
spin_unlock_irq(&p->sighand->siglock);
if (!exit_code)
@ -1532,10 +1536,10 @@ static int wait_task_continued(struct task_struct *p, int options,
}
if (!unlikely(options & WNOWAIT))
p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
uid = __task_cred(p)->uid;
spin_unlock_irq(&p->sighand->siglock);
pid = task_pid_vnr(p);
uid = p->cred->uid;
get_task_struct(p);
read_unlock(&tasklist_lock);

22
kernel/futex.c
View File

@ -439,15 +439,20 @@ static void free_pi_state(struct futex_pi_state *pi_state)
static struct task_struct * futex_find_get_task(pid_t pid)
{
struct task_struct *p;
uid_t euid = current_euid();
const struct cred *cred = current_cred(), *pcred;
rcu_read_lock();
p = find_task_by_vpid(pid);
if (!p || (euid != p->cred->euid &&
euid != p->cred->uid))
if (!p) {
p = ERR_PTR(-ESRCH);
else
get_task_struct(p);
} else {
pcred = __task_cred(p);
if (cred->euid != pcred->euid &&
cred->euid != pcred->uid)
p = ERR_PTR(-ESRCH);
else
get_task_struct(p);
}
rcu_read_unlock();
@ -1831,7 +1836,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
{
struct robust_list_head __user *head;
unsigned long ret;
uid_t euid = current_euid();
const struct cred *cred = current_cred(), *pcred;
if (!futex_cmpxchg_enabled)
return -ENOSYS;
@ -1847,8 +1852,9 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
if (!p)
goto err_unlock;
ret = -EPERM;
if (euid != p->cred->euid &&
euid != p->cred->uid &&
pcred = __task_cred(p);
if (cred->euid != pcred->euid &&
cred->euid != pcred->uid &&
!capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->robust_list;

7
kernel/futex_compat.c
View File

@ -135,7 +135,7 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
{
struct compat_robust_list_head __user *head;
unsigned long ret;
uid_t euid = current_euid();
const struct cred *cred = current_cred(), *pcred;
if (!futex_cmpxchg_enabled)
return -ENOSYS;
@ -151,8 +151,9 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
if (!p)
goto err_unlock;
ret = -EPERM;
if (euid != p->cred->euid &&
euid != p->cred->uid &&
pcred = __task_cred(p);
if (cred->euid != pcred->euid &&
cred->euid != pcred->uid &&
!capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->compat_robust_list;

22
kernel/ptrace.c
View File

@ -115,7 +115,7 @@ int ptrace_check_attach(struct task_struct *child, int kill)
int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
struct cred *cred = current->cred, *tcred = task->cred;
const struct cred *cred = current_cred(), *tcred;
/* May we inspect the given task?
* This check is used both for attaching with ptrace
@ -125,19 +125,23 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
* because setting up the necessary parent/child relationship
* or halting the specified task is impossible.
*/
uid_t uid = cred->uid;
gid_t gid = cred->gid;
int dumpable = 0;
/* Don't let security modules deny introspection */
if (task == current)
return 0;
if ((uid != tcred->euid ||
uid != tcred->suid ||
uid != tcred->uid ||
gid != tcred->egid ||
gid != tcred->sgid ||
gid != tcred->gid) && !capable(CAP_SYS_PTRACE))
rcu_read_lock();
tcred = __task_cred(task);
if ((cred->uid != tcred->euid ||
cred->uid != tcred->suid ||
cred->uid != tcred->uid ||
cred->gid != tcred->egid ||
cred->gid != tcred->sgid ||
cred->gid != tcred->gid) &&
!capable(CAP_SYS_PTRACE)) {
rcu_read_unlock();
return -EPERM;
}
rcu_read_unlock();
smp_rmb();
if (task->mm)
dumpable = get_dumpable(task->mm);

31
kernel/sched.c
View File

@ -345,7 +345,9 @@ static inline struct task_group *task_group(struct task_struct *p)
struct task_group *tg;
#ifdef CONFIG_USER_SCHED
tg = p->cred->user->tg;
rcu_read_lock();
tg = __task_cred(p)->user->tg;
rcu_read_unlock();
#elif defined(CONFIG_CGROUP_SCHED)
tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
struct task_group, css);
@ -5121,6 +5123,22 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
set_load_weight(p);
}
/*
* check the target process has a UID that matches the current process's
*/
static bool check_same_owner(struct task_struct *p)
{
const struct cred *cred = current_cred(), *pcred;
bool match;
rcu_read_lock();
pcred = __task_cred(p);
match = (cred->euid == pcred->euid ||
cred->euid == pcred->uid);
rcu_read_unlock();
return match;
}
static int __sched_setscheduler(struct task_struct *p, int policy,
struct sched_param *param, bool user)
{
@ -5128,7 +5146,6 @@ static int __sched_setscheduler(struct task_struct *p, int policy,
unsigned long flags;
const struct sched_class *prev_class = p->sched_class;
struct rq *rq;
uid_t euid;
/* may grab non-irq protected spin_locks */
BUG_ON(in_interrupt());
@ -5181,9 +5198,7 @@ static int __sched_setscheduler(struct task_struct *p, int policy,
return -EPERM;
/* can't change other user's priorities */
euid = current_euid();
if (euid != p->cred->euid &&
euid != p->cred->uid)
if (!check_same_owner(p))
return -EPERM;
}
@ -5394,7 +5409,6 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
cpumask_t cpus_allowed;
cpumask_t new_mask = *in_mask;
struct task_struct *p;
uid_t euid;
int retval;
get_online_cpus();
@ -5415,11 +5429,8 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
get_task_struct(p);
read_unlock(&tasklist_lock);
euid = current_euid();
retval = -EPERM;
if (euid != p->cred->euid &&
euid != p->cred->uid &&
!capable(CAP_SYS_NICE))
if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
goto out_unlock;
retval = security_task_setscheduler(p, 0, NULL);

49
kernel/signal.c
View File

@ -177,6 +177,11 @@ int next_signal(struct sigpending *pending, sigset_t *mask)
return sig;
}
/*
* allocate a new signal queue record
* - this may be called without locks if and only if t == current, otherwise an
* appopriate lock must be held to protect t's user_struct
*/
static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
int override_rlimit)
{
@ -184,11 +189,12 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
struct user_struct *user;
/*
* In order to avoid problems with "switch_user()", we want to make
* sure that the compiler doesn't re-load "t->user"
* We won't get problems with the target's UID changing under us
* because changing it requires RCU be used, and if t != current, the
* caller must be holding the RCU readlock (by way of a spinlock) and
* we use RCU protection here
*/
user = t->cred->user;
barrier();
user = __task_cred(t)->user;
atomic_inc(&user->sigpending);
if (override_rlimit ||
atomic_read(&user->sigpending) <=
@ -562,12 +568,13 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s)
/*
* Bad permissions for sending the signal
* - the caller must hold at least the RCU read lock
*/
static int check_kill_permission(int sig, struct siginfo *info,
struct task_struct *t)
{
const struct cred *cred = current_cred(), *tcred;
struct pid *sid;
uid_t uid, euid;
int error;
if (!valid_signal(sig))
@ -580,10 +587,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
if (error)
return error;
uid = current_uid();
euid = current_euid();
if ((euid ^ t->cred->suid) && (euid ^ t->cred->uid) &&
(uid ^ t->cred->suid) && (uid ^ t->cred->uid) &&
tcred = __task_cred(t);
if ((cred->euid ^ tcred->suid) &&
(cred->euid ^ tcred->uid) &&
(cred->uid ^ tcred->suid) &&
(cred->uid ^ tcred->uid) &&
!capable(CAP_KILL)) {
switch (sig) {
case SIGCONT:
@ -1011,6 +1019,10 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long
return sighand;
}
/*
* send signal info to all the members of a group
* - the caller must hold the RCU read lock at least
*/
int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
{
unsigned long flags;
@ -1032,8 +1044,8 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
/*
* __kill_pgrp_info() sends a signal to a process group: this is what the tty
* control characters do (^C, ^Z etc)
* - the caller must hold at least a readlock on tasklist_lock
*/
int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
{
struct task_struct *p = NULL;
@ -1089,6 +1101,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
{
int ret = -EINVAL;
struct task_struct *p;
const struct cred *pcred;
if (!valid_signal(sig))
return ret;
@ -1099,9 +1112,11 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
ret = -ESRCH;
goto out_unlock;
}
if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
&& (euid != p->cred->suid) && (euid != p->cred->uid)
&& (uid != p->cred->suid) && (uid != p->cred->uid)) {
pcred = __task_cred(p);
if ((info == SEND_SIG_NOINFO ||
(!is_si_special(info) && SI_FROMUSER(info))) &&
euid != pcred->suid && euid != pcred->uid &&
uid != pcred->suid && uid != pcred->uid) {
ret = -EPERM;
goto out_unlock;
}
@ -1372,10 +1387,9 @@ int do_notify_parent(struct task_struct *tsk, int sig)
*/
rcu_read_lock();
info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
info.si_uid = tsk->cred->uid;
thread_group_cputime(tsk, &cputime);
info.si_utime = cputime_to_jiffies(cputime.utime);
info.si_stime = cputime_to_jiffies(cputime.stime);
@ -1443,10 +1457,9 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
*/
rcu_read_lock();
info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
info.si_uid = tsk->cred->uid;
info.si_utime = cputime_to_clock_t(tsk->utime);
info.si_stime = cputime_to_clock_t(tsk->stime);
@ -1713,7 +1726,7 @@ static int ptrace_signal(int signr, siginfo_t *info,
info->si_errno = 0;
info->si_code = SI_USER;
info->si_pid = task_pid_vnr(current->parent);
info->si_uid = current->parent->cred->uid;
info->si_uid = task_uid(current->parent);
}
/* If the (new) signal is now blocked, requeue it. */

11
kernel/sys.c
View File

@ -112,14 +112,17 @@ EXPORT_SYMBOL(cad_pid);
void (*pm_power_off_prepare)(void);
/*
* set the priority of a task
* - the caller must hold the RCU read lock
*/
static int set_one_prio(struct task_struct *p, int niceval, int error)
{
uid_t euid = current_euid();
const struct cred *cred = current_cred(), *pcred = __task_cred(p);
int no_nice;
if (p->cred->uid != euid &&
p->cred->euid != euid &&
!capable(CAP_SYS_NICE)) {
if (pcred->uid != cred->euid &&
pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) {
error = -EPERM;
goto out;
}

6
kernel/tsacct.c
View File

@ -27,6 +27,7 @@
*/
void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
{
const struct cred *tcred;
struct timespec uptime, ts;
u64 ac_etime;
@ -53,10 +54,11 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
stats->ac_flag |= AXSIG;
stats->ac_nice = task_nice(tsk);
stats->ac_sched = tsk->policy;
stats->ac_uid = tsk->cred->uid;
stats->ac_gid = tsk->cred->gid;
stats->ac_pid = tsk->pid;
rcu_read_lock();
tcred = __task_cred(tsk);
stats->ac_uid = tcred->uid;
stats->ac_gid = tcred->gid;
stats->ac_ppid = pid_alive(tsk) ?
rcu_dereference(tsk->real_parent)->tgid : 0;
rcu_read_unlock();

8
mm/mempolicy.c
View File

@ -1110,7 +1110,7 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
const unsigned long __user *old_nodes,
const unsigned long __user *new_nodes)
{
struct cred *cred, *tcred;
const struct cred *cred = current_cred(), *tcred;
struct mm_struct *mm;
struct task_struct *task;
nodemask_t old;
@ -1145,14 +1145,16 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
* capabilities, superuser privileges or the same
* userid as the target process.
*/
cred = current->cred;
tcred = task->cred;
rcu_read_lock();
tcred = __task_cred(task);
if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
goto out;
}
rcu_read_unlock();
task_nodes = cpuset_mems_allowed(task);
/* Is the user allowed to access the target nodes? */

8
mm/migrate.c
View File

@ -1045,7 +1045,7 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
const int __user *nodes,
int __user *status, int flags)
{
struct cred *cred, *tcred;
const struct cred *cred = current_cred(), *tcred;
struct task_struct *task;
struct mm_struct *mm;
int err;
@ -1076,14 +1076,16 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
* capabilities, superuser privileges or the same
* userid as the target process.
*/
cred = current->cred;
tcred = task->cred;
rcu_read_lock();
tcred = __task_cred(task);
if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
goto out;
}
rcu_read_unlock();
err = security_task_movememory(task);
if (err)

6
mm/oom_kill.c
View File

@ -298,9 +298,9 @@ static void dump_tasks(const struct mem_cgroup *mem)
task_lock(p);
printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n",
p->pid, p->cred->uid, p->tgid, p->mm->total_vm,
get_mm_rss(p->mm), (int)task_cpu(p), p->oomkilladj,
p->comm);
p->pid, __task_cred(p)->uid, p->tgid,
p->mm->total_vm, get_mm_rss(p->mm), (int)task_cpu(p),
p->oomkilladj, p->comm);
task_unlock(p);
} while_each_thread(g, p);
}

64
security/commoncap.c
View File

@ -51,10 +51,13 @@ EXPORT_SYMBOL(cap_netlink_recv);
*/
int cap_capable(struct task_struct *tsk, int cap, int audit)
{
__u32 cap_raised;
/* Derived from include/linux/sched.h:capable. */
if (cap_raised(tsk->cred->cap_effective, cap))
return 0;
return -EPERM;
rcu_read_lock();
cap_raised = cap_raised(__task_cred(tsk)->cap_effective, cap);
rcu_read_unlock();
return cap_raised ? 0 : -EPERM;
}
int cap_settime(struct timespec *ts, struct timezone *tz)
@ -66,34 +69,42 @@ int cap_settime(struct timespec *ts, struct timezone *tz)
int cap_ptrace_may_access(struct task_struct *child, unsigned int mode)
{
/* Derived from arch/i386/kernel/ptrace.c:sys_ptrace. */
if (cap_issubset(child->cred->cap_permitted,
current->cred->cap_permitted))
return 0;
if (capable(CAP_SYS_PTRACE))
return 0;
return -EPERM;
int ret = 0;
rcu_read_lock();
if (!cap_issubset(child->cred->cap_permitted,
current->cred->cap_permitted) &&
!capable(CAP_SYS_PTRACE))
ret = -EPERM;
rcu_read_unlock();
return ret;
}
int cap_ptrace_traceme(struct task_struct *parent)
{
if (cap_issubset(current->cred->cap_permitted,
parent->cred->cap_permitted))
return 0;
if (has_capability(parent, CAP_SYS_PTRACE))
return 0;
return -EPERM;
int ret = 0;
rcu_read_lock();
if (!cap_issubset(current->cred->cap_permitted,
parent->cred->cap_permitted) &&
!has_capability(parent, CAP_SYS_PTRACE))
ret = -EPERM;
rcu_read_unlock();
return ret;
}
int cap_capget (struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
struct cred *cred = target->cred;
const struct cred *cred;
/* Derived from kernel/capability.c:sys_capget. */
rcu_read_lock();
cred = __task_cred(target);
*effective = cred->cap_effective;
*inheritable = cred->cap_inheritable;
*permitted = cred->cap_permitted;
rcu_read_unlock();
return 0;
}
@ -433,7 +444,7 @@ void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
int cap_bprm_secureexec (struct linux_binprm *bprm)
{
const struct cred *cred = current->cred;
const struct cred *cred = current_cred();
if (cred->uid != 0) {
if (bprm->cap_effective)
@ -511,11 +522,11 @@ static inline void cap_emulate_setxuid (int old_ruid, int old_euid,
if ((old_ruid == 0 || old_euid == 0 || old_suid == 0) &&
(cred->uid != 0 && cred->euid != 0 && cred->suid != 0) &&
!issecure(SECURE_KEEP_CAPS)) {
cap_clear (cred->cap_permitted);
cap_clear (cred->cap_effective);
cap_clear(cred->cap_permitted);
cap_clear(cred->cap_effective);
}
if (old_euid == 0 && cred->euid != 0) {
cap_clear (cred->cap_effective);
cap_clear(cred->cap_effective);
}
if (old_euid != 0 && cred->euid == 0) {
cred->cap_effective = cred->cap_permitted;
@ -582,9 +593,14 @@ int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid,
*/
static int cap_safe_nice(struct task_struct *p)
{
if (!cap_issubset(p->cred->cap_permitted,
current->cred->cap_permitted) &&
!capable(CAP_SYS_NICE))
int is_subset;
rcu_read_lock();
is_subset = cap_issubset(__task_cred(p)->cap_permitted,
current_cred()->cap_permitted);
rcu_read_unlock();
if (!is_subset && !capable(CAP_SYS_NICE))
return -EPERM;
return 0;
}

10
security/keys/permission.c
View File

@ -22,13 +22,16 @@ int key_task_permission(const key_ref_t key_ref,
struct task_struct *context,
key_perm_t perm)
{
struct cred *cred = context->cred;
const struct cred *cred;
struct key *key;
key_perm_t kperm;
int ret;
key = key_ref_to_ptr(key_ref);
rcu_read_lock();
cred = __task_cred(context);
/* use the second 8-bits of permissions for keys the caller owns */
if (key->uid == cred->fsuid) {
kperm = key->perm >> 16;
@ -43,10 +46,7 @@ int key_task_permission(const key_ref_t key_ref,
goto use_these_perms;
}
spin_lock(&cred->lock);
ret = groups_search(cred->group_info, key->gid);
spin_unlock(&cred->lock);
if (ret) {
kperm = key->perm >> 8;
goto use_these_perms;
@ -57,6 +57,8 @@ int key_task_permission(const key_ref_t key_ref,
kperm = key->perm;
use_these_perms:
rcu_read_lock();
/* use the top 8-bits of permissions for keys the caller possesses
* - possessor permissions are additive with other permissions
*/

24
security/keys/process_keys.c
View File

@ -412,10 +412,13 @@ key_ref_t search_process_keyrings(struct key_type *type,
struct task_struct *context)
{
struct request_key_auth *rka;
struct cred *cred;
key_ref_t key_ref, ret, err;
might_sleep();
cred = get_task_cred(context);
/* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
* searchable, but we failed to find a key or we found a negative key;
* otherwise we want to return a sample error (probably -EACCES) if
@ -428,9 +431,9 @@ key_ref_t search_process_keyrings(struct key_type *type,
err = ERR_PTR(-EAGAIN);
/* search the thread keyring first */
if (context->cred->thread_keyring) {
if (cred->thread_keyring) {
key_ref = keyring_search_aux(
make_key_ref(context->cred->thread_keyring, 1),
make_key_ref(cred->thread_keyring, 1),
context, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@ -495,9 +498,9 @@ key_ref_t search_process_keyrings(struct key_type *type,
}
}
/* or search the user-session keyring */
else if (context->cred->user->session_keyring) {
else if (cred->user->session_keyring) {
key_ref = keyring_search_aux(
make_key_ref(context->cred->user->session_keyring, 1),
make_key_ref(cred->user->session_keyring, 1),
context, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@ -519,20 +522,20 @@ key_ref_t search_process_keyrings(struct key_type *type,
* search the keyrings of the process mentioned there
* - we don't permit access to request_key auth keys via this method
*/
if (context->cred->request_key_auth &&
if (cred->request_key_auth &&
context == current &&
type != &key_type_request_key_auth
) {
/* defend against the auth key being revoked */
down_read(&context->cred->request_key_auth->sem);
down_read(&cred->request_key_auth->sem);
if (key_validate(context->cred->request_key_auth) == 0) {
rka = context->cred->request_key_auth->payload.data;
if (key_validate(cred->request_key_auth) == 0) {
rka = cred->request_key_auth->payload.data;
key_ref = search_process_keyrings(type, description,
match, rka->context);
up_read(&context->cred->request_key_auth->sem);
up_read(&cred->request_key_auth->sem);
if (!IS_ERR(key_ref))
goto found;
@ -549,7 +552,7 @@ key_ref_t search_process_keyrings(struct key_type *type,
break;
}
} else {
up_read(&context->cred->request_key_auth->sem);
up_read(&cred->request_key_auth->sem);
}
}
@ -557,6 +560,7 @@ key_ref_t search_process_keyrings(struct key_type *type,
key_ref = ret ? ret : err;
found:
put_cred(cred);
return key_ref;
} /* end search_process_keyrings() */

11
security/selinux/selinuxfs.c
View File

@ -95,13 +95,18 @@ extern void selnl_notify_setenforce(int val);
static int task_has_security(struct task_struct *tsk,
u32 perms)
{
struct task_security_struct *tsec;
const struct task_security_struct *tsec;
u32 sid = 0;
tsec = tsk->cred->security;
rcu_read_lock();
tsec = __task_cred(tsk)->security;
if (tsec)
sid = tsec->sid;
rcu_read_unlock();
if (!tsec)
return -EACCES;
return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
return avc_has_perm(sid, SECINITSID_SECURITY,
SECCLASS_SECURITY, perms, NULL);
}

32
security/smack/smack_lsm.c
View File

@ -30,6 +30,8 @@
#include "smack.h"
#define task_security(task) (task_cred_xxx((task), security))
/*
* I hope these are the hokeyist lines of code in the module. Casey.
*/
@ -1012,7 +1014,7 @@ static void smack_cred_free(struct cred *cred)
*/
static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
{
return smk_curacc(p->cred->security, MAY_WRITE);
return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@ -1023,7 +1025,7 @@ static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
*/
static int smack_task_getpgid(struct task_struct *p)
{
return smk_curacc(p->cred->security, MAY_READ);
return smk_curacc(task_security(p), MAY_READ);
}
/**
@ -1034,7 +1036,7 @@ static int smack_task_getpgid(struct task_struct *p)
*/
static int smack_task_getsid(struct task_struct *p)
{
return smk_curacc(p->cred->security, MAY_READ);
return smk_curacc(task_security(p), MAY_READ);
}
/**
@ -1046,7 +1048,7 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
*secid = smack_to_secid(p->cred->security);
*secid = smack_to_secid(task_security(p));
}
/**
@ -1062,7 +1064,7 @@ static int smack_task_setnice(struct task_struct *p, int nice)
rc = cap_task_setnice(p, nice);
if (rc == 0)
rc = smk_curacc(p->cred->security, MAY_WRITE);
rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@ -1079,7 +1081,7 @@ static int smack_task_setioprio(struct task_struct *p, int ioprio)
rc = cap_task_setioprio(p, ioprio);
if (rc == 0)
rc = smk_curacc(p->cred->security, MAY_WRITE);
rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@ -1091,7 +1093,7 @@ static int smack_task_setioprio(struct task_struct *p, int ioprio)
*/
static int smack_task_getioprio(struct task_struct *p)
{
return smk_curacc(p->cred->security, MAY_READ);
return smk_curacc(task_security(p), MAY_READ);
}
/**
@ -1109,7 +1111,7 @@ static int smack_task_setscheduler(struct task_struct *p, int policy,
rc = cap_task_setscheduler(p, policy, lp);
if (rc == 0)
rc = smk_curacc(p->cred->security, MAY_WRITE);
rc = smk_curacc(task_security(p), MAY_WRITE);
return rc;
}
@ -1121,7 +1123,7 @@ static int smack_task_setscheduler(struct task_struct *p, int policy,
*/
static int smack_task_getscheduler(struct task_struct *p)
{
return smk_curacc(p->cred->security, MAY_READ);
return smk_curacc(task_security(p), MAY_READ);
}
/**
@ -1132,7 +1134,7 @@ static int smack_task_getscheduler(struct task_struct *p)
*/
static int smack_task_movememory(struct task_struct *p)
{
return smk_curacc(p->cred->security, MAY_WRITE);
return smk_curacc(task_security(p), MAY_WRITE);
}
/**
@ -1155,13 +1157,13 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
* can write the receiver.
*/
if (secid == 0)
return smk_curacc(p->cred->security, MAY_WRITE);
return smk_curacc(task_security(p), MAY_WRITE);
/*
* If the secid isn't 0 we're dealing with some USB IO
* specific behavior. This is not clean. For one thing
* we can't take privilege into account.
*/
return smk_access(smack_from_secid(secid), p->cred->security, MAY_WRITE);
return smk_access(smack_from_secid(secid), task_security(p), MAY_WRITE);
}
/**
@ -1174,7 +1176,7 @@ static int smack_task_wait(struct task_struct *p)
{
int rc;
rc = smk_access(current->cred->security, p->cred->security, MAY_WRITE);
rc = smk_access(current_security(), task_security(p), MAY_WRITE);
if (rc == 0)
return 0;
@ -1205,7 +1207,7 @@ static int smack_task_wait(struct task_struct *p)
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
isp->smk_inode = p->cred->security;
isp->smk_inode = task_security(p);
}
/*
@ -2010,7 +2012,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
if (strcmp(name, "current") != 0)
return -EINVAL;
cp = kstrdup(p->cred->security, GFP_KERNEL);
cp = kstrdup(task_security(p), GFP_KERNEL);
if (cp == NULL)
return -ENOMEM;