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78eb4ea25c
const qualify the struct ctl_table argument in the proc_handler function
signatures. This is a prerequisite to moving the static ctl_table
structs into .rodata data which will ensure that proc_handler function
pointers cannot be modified.
This patch has been generated by the following coccinelle script:
```
virtual patch
@r1@
identifier ctl, write, buffer, lenp, ppos;
identifier func !~ "appldata_(timer|interval)_handler|sched_(rt|rr)_handler|rds_tcp_skbuf_handler|proc_sctp_do_(hmac_alg|rto_min|rto_max|udp_port|alpha_beta|auth|probe_interval)";
@@
int func(
- struct ctl_table *ctl
+ const struct ctl_table *ctl
,int write, void *buffer, size_t *lenp, loff_t *ppos);
@r2@
identifier func, ctl, write, buffer, lenp, ppos;
@@
int func(
- struct ctl_table *ctl
+ const struct ctl_table *ctl
,int write, void *buffer, size_t *lenp, loff_t *ppos)
{ ... }
@r3@
identifier func;
@@
int func(
- struct ctl_table *
+ const struct ctl_table *
,int , void *, size_t *, loff_t *);
@r4@
identifier func, ctl;
@@
int func(
- struct ctl_table *ctl
+ const struct ctl_table *ctl
,int , void *, size_t *, loff_t *);
@r5@
identifier func, write, buffer, lenp, ppos;
@@
int func(
- struct ctl_table *
+ const struct ctl_table *
,int write, void *buffer, size_t *lenp, loff_t *ppos);
```
* Code formatting was adjusted in xfs_sysctl.c to comply with code
conventions. The xfs_stats_clear_proc_handler,
xfs_panic_mask_proc_handler and xfs_deprecated_dointvec_minmax where
adjusted.
* The ctl_table argument in proc_watchdog_common was const qualified.
This is called from a proc_handler itself and is calling back into
another proc_handler, making it necessary to change it as part of the
proc_handler migration.
Co-developed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Co-developed-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Joel Granados <j.granados@samsung.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sysctl.c: General linux system control interface
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*/
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#include <linux/sysctl.h>
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#include <linux/printk.h>
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#include <linux/capability.h>
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#include <linux/ratelimit.h>
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#include "internal.h"
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static const int ten_thousand = 10000;
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static int proc_dointvec_minmax_sysadmin(const 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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if (write && !capable(CAP_SYS_ADMIN))
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return -EPERM;
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return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
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}
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static struct ctl_table printk_sysctls[] = {
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{
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.procname = "printk",
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.data = &console_loglevel,
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.maxlen = 4*sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "printk_ratelimit",
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.data = &printk_ratelimit_state.interval,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "printk_ratelimit_burst",
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.data = &printk_ratelimit_state.burst,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "printk_delay",
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.data = &printk_delay_msec,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = (void *)&ten_thousand,
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},
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{
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.procname = "printk_devkmsg",
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.data = devkmsg_log_str,
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.maxlen = DEVKMSG_STR_MAX_SIZE,
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.mode = 0644,
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.proc_handler = devkmsg_sysctl_set_loglvl,
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},
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{
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.procname = "dmesg_restrict",
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.data = &dmesg_restrict,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax_sysadmin,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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{
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.procname = "kptr_restrict",
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.data = &kptr_restrict,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax_sysadmin,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_TWO,
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},
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};
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void __init printk_sysctl_init(void)
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{
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register_sysctl_init("kernel", printk_sysctls);
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}
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