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authorEric Paris <eparis@redhat.com>2008-11-11 22:02:50 +1100
committerJames Morris <jmorris@namei.org>2008-11-11 22:02:50 +1100
commit06112163f5fd9e491a7f810443d81efa9d88e247 (patch)
tree48039f7488abbec36c0982a57405b57d47311dd6 /security/commoncap.c
parent637d32dc720897616e8a1a4f9e9609e29d431800 (diff)
downloadlinux-06112163f5fd9e491a7f810443d81efa9d88e247.tar.gz
Add a new capable interface that will be used by systems that use audit to
make an A or B type decision instead of a security decision. Currently this is the case at least for filesystems when deciding if a process can use the reserved 'root' blocks and for the case of things like the oom algorithm determining if processes are root processes and should be less likely to be killed. These types of security system requests should not be audited or logged since they are not really security decisions. It would be possible to solve this problem like the vm_enough_memory security check did by creating a new LSM interface and moving all of the policy into that interface but proves the needlessly bloat the LSM and provide complex indirection. This merely allows those decisions to be made where they belong and to not flood logs or printk with denials for thing that are not security decisions. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/commoncap.c')
-rw-r--r--security/commoncap.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/security/commoncap.c b/security/commoncap.c
index d4539338099..dc06c0086b5 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -49,7 +49,7 @@ EXPORT_SYMBOL(cap_netlink_recv);
* returns 0 when a task has a capability, but the kernel's capable()
* returns 1 for this case.
*/
-int cap_capable (struct task_struct *tsk, int cap)
+int cap_capable(struct task_struct *tsk, int cap, int audit)
{
/* Derived from include/linux/sched.h:capable. */
if (cap_raised(tsk->cap_effective, cap))
@@ -112,7 +112,7 @@ static inline int cap_inh_is_capped(void)
* to the old permitted set. That is, if the current task
* does *not* possess the CAP_SETPCAP capability.
*/
- return (cap_capable(current, CAP_SETPCAP) != 0);
+ return (cap_capable(current, CAP_SETPCAP, SECURITY_CAP_AUDIT) != 0);
}
static inline int cap_limit_ptraced_target(void) { return 1; }
@@ -677,7 +677,7 @@ int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
|| ((current->securebits & SECURE_ALL_LOCKS
& ~arg2)) /*[2]*/
|| (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/
- || (cap_capable(current, CAP_SETPCAP) != 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
@@ -742,7 +742,7 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages)
{
int cap_sys_admin = 0;
- if (cap_capable(current, CAP_SYS_ADMIN) == 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);
}