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Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c65
1 files changed, 57 insertions, 8 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4a13a389e99b..557d46728577 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -66,6 +66,7 @@
#include <linux/kexec.h>
#include <linux/bpf.h>
#include <linux/mount.h>
+#include <linux/pipe_fs_i.h>
#include <linux/uaccess.h>
#include <asm/processor.h>
@@ -1816,7 +1817,7 @@ static struct ctl_table fs_table[] = {
{
.procname = "pipe-max-size",
.data = &pipe_max_size,
- .maxlen = sizeof(int),
+ .maxlen = sizeof(pipe_max_size),
.mode = 0644,
.proc_handler = &pipe_proc_fn,
.extra1 = &pipe_min_size,
@@ -2575,12 +2576,13 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
if (write) {
unsigned int val = *lvalp;
+ if (*lvalp > UINT_MAX)
+ return -EINVAL;
+
if ((param->min && *param->min > val) ||
(param->max && *param->max < val))
return -ERANGE;
- if (*lvalp > UINT_MAX)
- return -EINVAL;
*valp = val;
} else {
unsigned int val = *valp;
@@ -2620,6 +2622,48 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
do_proc_douintvec_minmax_conv, &param);
}
+struct do_proc_dopipe_max_size_conv_param {
+ unsigned int *min;
+};
+
+static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
+ unsigned int *valp,
+ int write, void *data)
+{
+ struct do_proc_dopipe_max_size_conv_param *param = data;
+
+ if (write) {
+ unsigned int val;
+
+ if (*lvalp > UINT_MAX)
+ return -EINVAL;
+
+ val = round_pipe_size(*lvalp);
+ if (val == 0)
+ return -EINVAL;
+
+ if (param->min && *param->min > val)
+ return -ERANGE;
+
+ *valp = val;
+ } else {
+ unsigned int val = *valp;
+ *lvalp = (unsigned long) val;
+ }
+
+ return 0;
+}
+
+int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct do_proc_dopipe_max_size_conv_param param = {
+ .min = (unsigned int *) table->extra1,
+ };
+ return do_proc_douintvec(table, write, buffer, lenp, ppos,
+ do_proc_dopipe_max_size_conv, &param);
+}
+
static void validate_coredump_safety(void)
{
#ifdef CONFIG_COREDUMP
@@ -3083,14 +3127,12 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
else
bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
}
- kfree(tmp_bitmap);
*lenp -= left;
*ppos += *lenp;
- return 0;
- } else {
- kfree(tmp_bitmap);
- return err;
}
+
+ kfree(tmp_bitmap);
+ return err;
}
#else /* CONFIG_PROC_SYSCTL */
@@ -3125,6 +3167,12 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
return -ENOSYS;
}
+int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return -ENOSYS;
+}
+
int proc_dointvec_jiffies(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -3168,6 +3216,7 @@ EXPORT_SYMBOL(proc_douintvec);
EXPORT_SYMBOL(proc_dointvec_jiffies);
EXPORT_SYMBOL(proc_dointvec_minmax);
EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
+EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
EXPORT_SYMBOL(proc_dostring);