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![Dan Carpenter](/assets/img/avatar_default.png)
In the original code, the "if (*lenp < 0)" check didn't work because "*lenp" is unsigned. Fortunately, the memory_read_from_buffer() call will never fail in this context so it doesn't affect runtime. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
193 lines
3.5 KiB
C
193 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/net/sunrpc/sysctl.c
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*
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* Sysctl interface to sunrpc module.
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*
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* I would prefer to register the sunrpc table below sys/net, but that's
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* impossible at the moment.
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*/
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#include <linux/types.h>
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#include <linux/linkage.h>
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#include <linux/ctype.h>
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#include <linux/fs.h>
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#include <linux/sysctl.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include "netns.h"
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/*
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* Declare the debug flags here
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*/
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unsigned int rpc_debug;
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EXPORT_SYMBOL_GPL(rpc_debug);
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unsigned int nfs_debug;
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EXPORT_SYMBOL_GPL(nfs_debug);
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unsigned int nfsd_debug;
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EXPORT_SYMBOL_GPL(nfsd_debug);
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unsigned int nlm_debug;
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EXPORT_SYMBOL_GPL(nlm_debug);
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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static struct ctl_table_header *sunrpc_table_header;
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static struct ctl_table sunrpc_table[];
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void
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rpc_register_sysctl(void)
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{
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if (!sunrpc_table_header)
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sunrpc_table_header = register_sysctl_table(sunrpc_table);
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}
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void
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rpc_unregister_sysctl(void)
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{
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if (sunrpc_table_header) {
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unregister_sysctl_table(sunrpc_table_header);
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sunrpc_table_header = NULL;
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}
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}
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static int proc_do_xprt(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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char tmpbuf[256];
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ssize_t len;
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if (write || *ppos) {
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*lenp = 0;
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return 0;
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}
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len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
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len = memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
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if (len < 0) {
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*lenp = 0;
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return -EINVAL;
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}
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*lenp = len;
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return 0;
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}
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static int
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proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp,
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loff_t *ppos)
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{
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char tmpbuf[20], *s = NULL;
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char *p;
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unsigned int value;
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size_t left, len;
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if ((*ppos && !write) || !*lenp) {
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*lenp = 0;
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return 0;
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}
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left = *lenp;
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if (write) {
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p = buffer;
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while (left && isspace(*p)) {
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left--;
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p++;
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}
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if (!left)
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goto done;
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if (left > sizeof(tmpbuf) - 1)
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return -EINVAL;
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memcpy(tmpbuf, p, left);
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tmpbuf[left] = '\0';
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value = simple_strtol(tmpbuf, &s, 0);
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if (s) {
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left -= (s - tmpbuf);
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if (left && !isspace(*s))
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return -EINVAL;
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while (left && isspace(*s)) {
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left--;
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s++;
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}
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} else
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left = 0;
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*(unsigned int *) table->data = value;
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/* Display the RPC tasks on writing to rpc_debug */
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if (strcmp(table->procname, "rpc_debug") == 0)
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rpc_show_tasks(&init_net);
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} else {
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len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
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if (len > left)
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len = left;
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memcpy(buffer, tmpbuf, len);
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if ((left -= len) > 0) {
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*((char *)buffer + len) = '\n';
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left--;
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}
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}
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done:
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*lenp -= left;
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*ppos += *lenp;
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return 0;
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}
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static struct ctl_table debug_table[] = {
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{
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.procname = "rpc_debug",
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.data = &rpc_debug,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dodebug
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},
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{
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.procname = "nfs_debug",
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.data = &nfs_debug,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dodebug
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},
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{
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.procname = "nfsd_debug",
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.data = &nfsd_debug,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dodebug
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},
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{
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.procname = "nlm_debug",
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.data = &nlm_debug,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dodebug
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},
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{
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.procname = "transports",
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.maxlen = 256,
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.mode = 0444,
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.proc_handler = proc_do_xprt,
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},
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{ }
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};
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static struct ctl_table sunrpc_table[] = {
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{
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.procname = "sunrpc",
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.mode = 0555,
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.child = debug_table
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},
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{ }
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};
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#endif
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