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[PATCH] IPC namespace - sysctls
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Sysctl tweaks for IPC namespace

Signed-off-by: Pavel Emelianiov <[email protected]>
Signed-off-by: Kirill Korotaev <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Kirill Korotaev authored and Linus Torvalds committed Oct 2, 2006
1 parent 4e98231 commit fcfbd54
Showing 1 changed file with 88 additions and 28 deletions.
116 changes: 88 additions & 28 deletions kernel/sysctl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -92,13 +92,8 @@ extern char modprobe_path[];
extern int sg_big_buff;
#endif
#ifdef CONFIG_SYSVIPC
extern size_t shm_ctlmax;
extern size_t shm_ctlall;
extern int shm_ctlmni;
extern int msg_ctlmax;
extern int msg_ctlmnb;
extern int msg_ctlmni;
extern int sem_ctls[];
static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

#ifdef __sparc__
Expand Down Expand Up @@ -481,58 +476,58 @@ static ctl_table kern_table[] = {
{
.ctl_name = KERN_SHMMAX,
.procname = "shmmax",
.data = &shm_ctlmax,
.data = NULL,
.maxlen = sizeof (size_t),
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_SHMALL,
.procname = "shmall",
.data = &shm_ctlall,
.data = NULL,
.maxlen = sizeof (size_t),
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_SHMMNI,
.procname = "shmmni",
.data = &shm_ctlmni,
.data = NULL,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_MSGMAX,
.procname = "msgmax",
.data = &msg_ctlmax,
.data = NULL,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_MSGMNI,
.procname = "msgmni",
.data = &msg_ctlmni,
.data = NULL,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_MSGMNB,
.procname = "msgmnb",
.data = &msg_ctlmnb,
.data = NULL,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &proc_do_ipc_string,
},
{
.ctl_name = KERN_SEM,
.procname = "sem",
.data = &sem_ctls,
.data = NULL,
.maxlen = 4*sizeof (int),
.mode = 0644,
.proc_handler = &proc_dointvec,
.proc_handler = &proc_do_ipc_string,
},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
Expand Down Expand Up @@ -1832,8 +1827,9 @@ static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
return 0;
}

static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos,
static int __do_proc_dointvec(void *tbl_data, ctl_table *table,
int write, struct file *filp, void __user *buffer,
size_t *lenp, loff_t *ppos,
int (*conv)(int *negp, unsigned long *lvalp, int *valp,
int write, void *data),
void *data)
Expand All @@ -1846,13 +1842,13 @@ static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
char buf[TMPBUFLEN], *p;
char __user *s = buffer;

if (!table->data || !table->maxlen || !*lenp ||
if (!tbl_data || !table->maxlen || !*lenp ||
(*ppos && !write)) {
*lenp = 0;
return 0;
}

i = (int *) table->data;
i = (int *) tbl_data;
vleft = table->maxlen / sizeof(*i);
left = *lenp;

Expand Down Expand Up @@ -1941,6 +1937,16 @@ static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
#undef TMPBUFLEN
}

static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos,
int (*conv)(int *negp, unsigned long *lvalp, int *valp,
int write, void *data),
void *data)
{
return __do_proc_dointvec(table->data, table, write, filp,
buffer, lenp, ppos, conv, data);
}

/**
* proc_dointvec - read a vector of integers
* @table: the sysctl table
Expand Down Expand Up @@ -2074,7 +2080,7 @@ int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
do_proc_dointvec_minmax_conv, &param);
}

static int do_proc_doulongvec_minmax(ctl_table *table, int write,
static int __do_proc_doulongvec_minmax(void *data, ctl_table *table, int write,
struct file *filp,
void __user *buffer,
size_t *lenp, loff_t *ppos,
Expand All @@ -2088,13 +2094,13 @@ static int do_proc_doulongvec_minmax(ctl_table *table, int write,
char buf[TMPBUFLEN], *p;
char __user *s = buffer;

if (!table->data || !table->maxlen || !*lenp ||
if (!data || !table->maxlen || !*lenp ||
(*ppos && !write)) {
*lenp = 0;
return 0;
}

i = (unsigned long *) table->data;
i = (unsigned long *) data;
min = (unsigned long *) table->extra1;
max = (unsigned long *) table->extra2;
vleft = table->maxlen / sizeof(unsigned long);
Expand Down Expand Up @@ -2179,6 +2185,17 @@ static int do_proc_doulongvec_minmax(ctl_table *table, int write,
#undef TMPBUFLEN
}

static int do_proc_doulongvec_minmax(ctl_table *table, int write,
struct file *filp,
void __user *buffer,
size_t *lenp, loff_t *ppos,
unsigned long convmul,
unsigned long convdiv)
{
return __do_proc_doulongvec_minmax(table->data, table, write,
filp, buffer, lenp, ppos, convmul, convdiv);
}

/**
* proc_doulongvec_minmax - read a vector of long integers with min/max values
* @table: the sysctl table
Expand Down Expand Up @@ -2367,6 +2384,49 @@ int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
do_proc_dointvec_ms_jiffies_conv, NULL);
}

#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)
{
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,
lenp, ppos, NULL, NULL);
proc_minmax:
return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
lenp, ppos, 1l, 1l);
}
#endif

#else /* CONFIG_PROC_FS */

int proc_dostring(ctl_table *table, int write, struct file *filp,
Expand Down

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