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CRED: Wrap task credential accesses in the core kernel

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Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Cc: Al Viro <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
David Howells 2008-11-14 10:39:12 +11:00 • committed by James Morris
commit 76aac0e9a1
15 changed files with 72 additions and 52 deletions
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15
kernel/signal.c
View file

@ -567,6 +567,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
struct task_struct *t)
{
struct pid *sid;
uid_t uid, euid;
int error;
if (!valid_signal(sig))
@ -579,8 +580,10 @@ static int check_kill_permission(int sig, struct siginfo *info,
if (error)
return error;
if ((current->euid ^ t->suid) && (current->euid ^ t->uid) &&
(current->uid ^ t->suid) && (current->uid ^ t->uid) &&
uid = current_uid();
euid = current_euid();
if ((euid ^ t->suid) && (euid ^ t->uid) &&
(uid ^ t->suid) && (uid ^ t->uid) &&
!capable(CAP_KILL)) {
switch (sig) {
case SIGCONT:
@ -844,7 +847,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
q->info.si_errno = 0;
q->info.si_code = SI_USER;
q->info.si_pid = task_pid_vnr(current);
q->info.si_uid = current->uid;
q->info.si_uid = current_uid();
break;
case (unsigned long) SEND_SIG_PRIV:
q->info.si_signo = sig;
@ -1598,7 +1601,7 @@ void ptrace_notify(int exit_code)
info.si_signo = SIGTRAP;
info.si_code = exit_code;
info.si_pid = task_pid_vnr(current);
info.si_uid = current->uid;
info.si_uid = current_uid();
/* Let the debugger run. */
spin_lock_irq(&current->sighand->siglock);
@ -2211,7 +2214,7 @@ sys_kill(pid_t pid, int sig)
info.si_errno = 0;
info.si_code = SI_USER;
info.si_pid = task_tgid_vnr(current);
info.si_uid = current->uid;
info.si_uid = current_uid();
return kill_something_info(sig, &info, pid);
}
@ -2228,7 +2231,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = task_tgid_vnr(current);
info.si_uid = current->uid;
info.si_uid = current_uid();
rcu_read_lock();
p = find_task_by_vpid(pid);