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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>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_PID_SYSCTL_H
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#define LINUX_PID_SYSCTL_H
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#include <linux/pid_namespace.h>
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#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
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static int pid_mfd_noexec_dointvec_minmax(const struct ctl_table *table,
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int write, void *buf, size_t *lenp, loff_t *ppos)
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{
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struct pid_namespace *ns = task_active_pid_ns(current);
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struct ctl_table table_copy;
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int err, scope, parent_scope;
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if (write && !ns_capable(ns->user_ns, CAP_SYS_ADMIN))
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return -EPERM;
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table_copy = *table;
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/* You cannot set a lower enforcement value than your parent. */
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parent_scope = pidns_memfd_noexec_scope(ns->parent);
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/* Equivalent to pidns_memfd_noexec_scope(ns). */
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scope = max(READ_ONCE(ns->memfd_noexec_scope), parent_scope);
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table_copy.data = &scope;
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table_copy.extra1 = &parent_scope;
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err = proc_dointvec_minmax(&table_copy, write, buf, lenp, ppos);
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if (!err && write)
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WRITE_ONCE(ns->memfd_noexec_scope, scope);
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return err;
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}
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static const struct ctl_table pid_ns_ctl_table_vm[] = {
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{
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.procname = "memfd_noexec",
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.data = &init_pid_ns.memfd_noexec_scope,
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.maxlen = sizeof(init_pid_ns.memfd_noexec_scope),
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.mode = 0644,
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.proc_handler = pid_mfd_noexec_dointvec_minmax,
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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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static inline void register_pid_ns_sysctl_table_vm(void)
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{
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register_sysctl("vm", pid_ns_ctl_table_vm);
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}
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#else
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static inline void register_pid_ns_sysctl_table_vm(void) {}
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#endif
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#endif /* LINUX_PID_SYSCTL_H */
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