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[PATCH] sysctl: simplify ipc ns specific sysctls

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Refactor the ipc sysctl support so that it is simpler, more readable, and
prepares for fixing the bug with the wrong values being returned in the
sys_sysctl interface.

The function proc_do_ipc_string() was misnamed as it never handled strings.
It's magic of when to work with strings and when to work with longs belonged
in the sysctl table.  I couldn't tell if the code would work if you disabled
the ipc namespace but it certainly looked like it would have problems.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2006-12-08 02:39:56 -08:00 committed by Linus Torvalds
parent c4b8b769fa
commit 9bc9a6bd3c
1 changed files with 49 additions and 57 deletions
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106
kernel/sysctl.c
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@ -92,7 +92,9 @@ extern char modprobe_path[];
extern int sg_big_buff;
#endif
#ifdef CONFIG_SYSVIPC
static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
static int proc_ipc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
@ -189,6 +191,18 @@ static void put_uts(ctl_table *table, int write, void *which)
up_write(&uts_sem);
}
#ifdef CONFIG_SYSVIPC
static void *get_ipc(ctl_table *table, int write)
{
char *which = table->data;
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
return which;
}
#else
#define get_ipc(T,W) ((T)->data)
#endif
/* /proc declarations: */
#ifdef CONFIG_PROC_SYSCTL
@ -458,58 +472,58 @@ static ctl_table kern_table[] = {
{
.ctl_name = KERN_SHMMAX,
.procname = "shmmax",
.data = NULL,
.maxlen = sizeof (size_t),
.data = &init_ipc_ns.shm_ctlmax,
.maxlen = sizeof (init_ipc_ns.shm_ctlmax),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_doulongvec_minmax,
},
{
.ctl_name = KERN_SHMALL,
.procname = "shmall",
.data = NULL,
.maxlen = sizeof (size_t),
.data = &init_ipc_ns.shm_ctlall,
.maxlen = sizeof (init_ipc_ns.shm_ctlall),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_doulongvec_minmax,
},
{
.ctl_name = KERN_SHMMNI,
.procname = "shmmni",
.data = NULL,
.maxlen = sizeof (int),
.data = &init_ipc_ns.shm_ctlmni,
.maxlen = sizeof (init_ipc_ns.shm_ctlmni),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_dointvec,
},
{
.ctl_name = KERN_MSGMAX,
.procname = "msgmax",
.data = NULL,
.maxlen = sizeof (int),
.data = &init_ipc_ns.msg_ctlmax,
.maxlen = sizeof (init_ipc_ns.msg_ctlmax),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_dointvec,
},
{
.ctl_name = KERN_MSGMNI,
.procname = "msgmni",
.data = NULL,
.maxlen = sizeof (int),
.data = &init_ipc_ns.msg_ctlmni,
.maxlen = sizeof (init_ipc_ns.msg_ctlmni),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_dointvec,
},
{
.ctl_name = KERN_MSGMNB,
.procname = "msgmnb",
.data = NULL,
.maxlen = sizeof (int),
.data = &init_ipc_ns.msg_ctlmnb,
.maxlen = sizeof (init_ipc_ns.msg_ctlmnb),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_dointvec,
},
{
.ctl_name = KERN_SEM,
.procname = "sem",
.data = NULL,
.data = &init_ipc_ns.sem_ctls,
.maxlen = 4*sizeof (int),
.mode = 0644,
.proc_handler = &proc_do_ipc_string,
.proc_handler = &proc_ipc_dointvec,
},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
@ -2319,46 +2333,24 @@ int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
}
#ifdef CONFIG_SYSVIPC
static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
void *data;
struct ipc_namespace *ns;
ns = current->nsproxy->ipc_ns;
switch (table->ctl_name) {
case KERN_SHMMAX:
data = &ns->shm_ctlmax;
goto proc_minmax;
case KERN_SHMALL:
data = &ns->shm_ctlall;
goto proc_minmax;
case KERN_SHMMNI:
data = &ns->shm_ctlmni;
break;
case KERN_MSGMAX:
data = &ns->msg_ctlmax;
break;
case KERN_MSGMNI:
data = &ns->msg_ctlmni;
break;
case KERN_MSGMNB:
data = &ns->msg_ctlmnb;
break;
case KERN_SEM:
data = &ns->sem_ctls;
break;
default:
return -EINVAL;
}
return __do_proc_dointvec(data, table, write, filp, buffer,
void *which;
which = get_ipc(table, write);
return __do_proc_dointvec(which, table, write, filp, buffer,
lenp, ppos, NULL, NULL);
proc_minmax:
return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
}
static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
{
void *which;
which = get_ipc(table, write);
return __do_proc_doulongvec_minmax(which, table, write, filp, buffer,
lenp, ppos, 1l, 1l);
}
#endif
static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,