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Subject[PATCH v3 02/27] SECURITY: add task_struct to setrlimit
Date
From: Jiri Slaby <jirislaby@gmail.com>

Add task_struct to task_setrlimit of security_operations to be able to set
rlimit of different task than current.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
---
include/linux/security.h | 9 ++++++---
kernel/sys.c | 2 +-
security/capability.c | 3 ++-
security/security.c | 5 +++--
security/selinux/hooks.c | 7 ++++---
5 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index 239e40d..193b3d9 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1570,7 +1570,8 @@ struct security_operations {
int (*task_setnice) (struct task_struct *p, int nice);
int (*task_setioprio) (struct task_struct *p, int ioprio);
int (*task_getioprio) (struct task_struct *p);
- int (*task_setrlimit) (unsigned int resource, struct rlimit *new_rlim);
+ int (*task_setrlimit) (struct task_struct *p, unsigned int resource,
+ struct rlimit *new_rlim);
int (*task_setscheduler) (struct task_struct *p, int policy,
struct sched_param *lp);
int (*task_getscheduler) (struct task_struct *p);
@@ -1835,7 +1836,8 @@ int security_task_setgroups(struct group_info *group_info);
int security_task_setnice(struct task_struct *p, int nice);
int security_task_setioprio(struct task_struct *p, int ioprio);
int security_task_getioprio(struct task_struct *p);
-int security_task_setrlimit(unsigned int resource, struct rlimit *new_rlim);
+int security_task_setrlimit(struct task_struct *p, unsigned int resource,
+ struct rlimit *new_rlim);
int security_task_setscheduler(struct task_struct *p,
int policy, struct sched_param *lp);
int security_task_getscheduler(struct task_struct *p);
@@ -2451,7 +2453,8 @@ static inline int security_task_getioprio(struct task_struct *p)
return 0;
}

-static inline int security_task_setrlimit(unsigned int resource,
+static inline int security_task_setrlimit(struct task_struct *p,
+ unsigned int resource,
struct rlimit *new_rlim)
{
return 0;
diff --git a/kernel/sys.c b/kernel/sys.c
index ce17760..9898a8a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1256,7 +1256,7 @@ SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
return -EPERM;

- retval = security_task_setrlimit(resource, &new_rlim);
+ retval = security_task_setrlimit(current, resource, &new_rlim);
if (retval)
return retval;

diff --git a/security/capability.c b/security/capability.c
index fce07a7..5882ec0 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -450,7 +450,8 @@ static int cap_task_getioprio(struct task_struct *p)
return 0;
}

-static int cap_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
+static int cap_task_setrlimit(struct task_struct *p, unsigned int resource,
+ struct rlimit *new_rlim)
{
return 0;
}
diff --git a/security/security.c b/security/security.c
index c4c6732..4b23d83 100644
--- a/security/security.c
+++ b/security/security.c
@@ -781,9 +781,10 @@ int security_task_getioprio(struct task_struct *p)
return security_ops->task_getioprio(p);
}

-int security_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
+int security_task_setrlimit(struct task_struct *p, unsigned int resource,
+ struct rlimit *new_rlim)
{
- return security_ops->task_setrlimit(resource, new_rlim);
+ return security_ops->task_setrlimit(p, resource, new_rlim);
}

int security_task_setscheduler(struct task_struct *p,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 36d9e25..1167f01 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3390,16 +3390,17 @@ static int selinux_task_getioprio(struct task_struct *p)
return current_has_perm(p, PROCESS__GETSCHED);
}

-static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
+static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
+ struct rlimit *new_rlim)
{
- struct rlimit *old_rlim = current->signal->rlim + resource;
+ struct rlimit *old_rlim = p->signal->rlim + resource;

/* Control the ability to change the hard limit (whether
lowering or raising it), so that the hard limit can
later be used as a safe reset point for the soft limit
upon context transitions. See selinux_bprm_committing_creds. */
if (old_rlim->rlim_max != new_rlim->rlim_max)
- return current_has_perm(current, PROCESS__SETRLIMIT);
+ return current_has_perm(p, PROCESS__SETRLIMIT);

return 0;
}
--
1.6.5.3


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