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1751f872cc
Add the const qualifier to all the ctl_tables in the tree except for
watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls,
loadpin_sysctl_table and the ones calling register_net_sysctl (./net,
drivers/inifiniband dirs). These are special cases as they use a
registration function with a non-const qualified ctl_table argument or
modify the arrays before passing them on to the registration function.
Constifying ctl_table structs will prevent the modification of
proc_handler function pointers as the arrays would reside in .rodata.
This is made possible after commit 78eb4ea25c ("sysctl: treewide:
constify the ctl_table argument of proc_handlers") constified all the
proc_handlers.
Created this by running an spatch followed by a sed command:
Spatch:
virtual patch
@
depends on !(file in "net")
disable optional_qualifier
@
identifier table_name != {
watchdog_hardlockup_sysctl,
iwcm_ctl_table,
ucma_ctl_table,
memory_allocation_profiling_sysctls,
loadpin_sysctl_table
};
@@
+ const
struct ctl_table table_name [] = { ... };
sed:
sed --in-place \
-e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \
kernel/utsname_sysctl.c
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> # for kernel/trace/
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # SCSI
Reviewed-by: Darrick J. Wong <djwong@kernel.org> # xfs
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
84 lines
1.9 KiB
C
84 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 const 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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