GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-28 09:31:14 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Revert "CRED: Fix regression in cap_capable() as shown up by sys_faccessat() [ver #2]"

Browse source 
This reverts commit 14eaddc967.

David has a better version to come.
This commit is contained in:
James Morris 2009-01-07 09:21:54 +11:00
parent 76f7ba35d4
commit 29881c4502
9 changed files with 35 additions and 129 deletions
Download patch file Download diff file Expand all files Collapse all files

42
security/commoncap.c
View file

@ -43,44 +43,28 @@ int cap_netlink_recv(struct sk_buff *skb, int cap)
EXPORT_SYMBOL(cap_netlink_recv);
/**
* cap_capable - Determine whether current has a particular effective capability
* cap_capable - Determine whether a task has a particular effective capability
* @tsk: The task to query
* @cap: The capability to check for
* @audit: Whether to write an audit message or not
*
* Determine whether the nominated task has the specified capability amongst
* its effective set, returning 0 if it does, -ve if it does not. Note that
* this uses current's subjective/effective credentials.
* its effective set, returning 0 if it does, -ve if it does not.
*
* NOTE WELL: cap_capable() cannot be used like the kernel's capable()
* function. That is, it has the reverse semantics: cap_capable() returns 0
* when a task has a capability, but the kernel's capable() returns 1 for this
* case.
*/
int cap_capable(int cap, int audit)
int cap_capable(struct task_struct *tsk, int cap, int audit)
{
return cap_raised(current_cap(), cap) ? 0 : -EPERM;
}
__u32 cap_raised;
/**
* cap_has_capability - Determine whether a task has a particular effective capability
* @tsk: The task to query
* @cred: The credentials to use
* @cap: The capability to check for
* @audit: Whether to write an audit message or not
*
* Determine whether the nominated task has the specified capability amongst
* its effective set, returning 0 if it does, -ve if it does not. Note that
* this uses the task's objective/real credentials.
*
* NOTE WELL: cap_has_capability() cannot be used like the kernel's
* has_capability() function. That is, it has the reverse semantics:
* cap_has_capability() returns 0 when a task has a capability, but the
* kernel's has_capability() returns 1 for this case.
*/
int cap_task_capable(struct task_struct *tsk, const struct cred *cred, int cap,
int audit)
{
return cap_raised(cred->cap_effective, cap) ? 0 : -EPERM;
/* Derived from include/linux/sched.h:capable. */
rcu_read_lock();
cap_raised = cap_raised(__task_cred(tsk)->cap_effective, cap);
rcu_read_unlock();
return cap_raised ? 0 : -EPERM;
}
/**
@ -176,7 +160,7 @@ static inline int cap_inh_is_capped(void)
/* they are so limited unless the current task has the CAP_SETPCAP
* capability
*/
if (cap_capable(CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0)
if (cap_capable(current, CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0)
return 0;
#endif
return 1;
@ -885,7 +869,7 @@ int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
& (new->securebits ^ arg2)) /*[1]*/
|| ((new->securebits & SECURE_ALL_LOCKS & ~arg2)) /*[2]*/
|| (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/
|| (cap_capable(CAP_SETPCAP, SECURITY_CAP_AUDIT) != 0) /*[4]*/
|| (cap_capable(current, CAP_SETPCAP, SECURITY_CAP_AUDIT) != 0) /*[4]*/
/*
* [1] no changing of bits that are locked
* [2] no unlocking of locks
@ -966,7 +950,7 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages)
{
int cap_sys_admin = 0;
if (cap_capable(CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT) == 0)
if (cap_capable(current, CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT) == 0)
cap_sys_admin = 1;
return __vm_enough_memory(mm, pages, cap_sys_admin);
}