change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/ipc/ipc_sysctl.c
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@@ -1,12 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  Copyright (C) 2007
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  *
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  *  Author: Eric Biederman <ebiederm@xmision.com>
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- *
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- *  This program is free software; you can redistribute it and/or
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- *  modify it under the terms of the GNU General Public License as
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- *  published by the Free Software Foundation, version 2 of the
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- *  License.
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  */
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 #include <linux/module.h>
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@@ -28,7 +24,7 @@
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 #ifdef CONFIG_PROC_SYSCTL
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 static int proc_ipc_dointvec(struct ctl_table *table, int write,
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-	void __user *buffer, size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	struct ctl_table ipc_table;
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@@ -39,7 +35,7 @@
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 }
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 static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
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-	void __user *buffer, size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	struct ctl_table ipc_table;
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@@ -50,7 +46,7 @@
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 }
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 static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
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-	void __user *buffer, size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	struct ipc_namespace *ns = current->nsproxy->ipc_ns;
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 	int err = proc_ipc_dointvec_minmax(table, write, buffer, lenp, ppos);
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@@ -63,7 +59,7 @@
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 }
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 static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
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-	void __user *buffer, size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	struct ctl_table ipc_table;
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 	memcpy(&ipc_table, table, sizeof(ipc_table));
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@@ -74,7 +70,7 @@
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 }
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 static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
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-	void __user *buffer, size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	struct ctl_table ipc_table;
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 	int dummy = 0;
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@@ -88,17 +84,38 @@
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 	return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
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 }
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+static int proc_ipc_sem_dointvec(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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+	int ret, semmni;
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+	struct ipc_namespace *ns = current->nsproxy->ipc_ns;
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+
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+	semmni = ns->sem_ctls[3];
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+	ret = proc_ipc_dointvec(table, write, buffer, lenp, ppos);
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+
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+	if (!ret)
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+		ret = sem_check_semmni(current->nsproxy->ipc_ns);
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+
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+	/*
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+	 * Reset the semmni value if an error happens.
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+	 */
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+	if (ret)
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+		ns->sem_ctls[3] = semmni;
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+	return ret;
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+}
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+
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 #else
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 #define proc_ipc_doulongvec_minmax NULL
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 #define proc_ipc_dointvec	   NULL
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 #define proc_ipc_dointvec_minmax   NULL
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 #define proc_ipc_dointvec_minmax_orphans   NULL
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 #define proc_ipc_auto_msgmni	   NULL
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+#define proc_ipc_sem_dointvec	   NULL
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 #endif
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-static int zero;
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-static int one = 1;
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-static int int_max = INT_MAX;
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+int ipc_mni = IPCMNI;
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+int ipc_mni_shift = IPCMNI_SHIFT;
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+int ipc_min_cycle = RADIX_TREE_MAP_SIZE;
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 static struct ctl_table ipc_kern_table[] = {
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 	{
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@@ -120,7 +137,9 @@
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 		.data		= &init_ipc_ns.shm_ctlmni,
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 		.maxlen		= sizeof(init_ipc_ns.shm_ctlmni),
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 		.mode		= 0644,
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-		.proc_handler	= proc_ipc_dointvec,
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+		.proc_handler	= proc_ipc_dointvec_minmax,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= &ipc_mni,
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 	},
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 	{
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 		.procname	= "shm_rmid_forced",
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@@ -128,8 +147,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.shm_rmid_forced),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax_orphans,
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-		.extra1		= &zero,
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-		.extra2		= &one,
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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	= "msgmax",
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@@ -137,8 +156,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.msg_ctlmax),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= SYSCTL_INT_MAX,
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 	},
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 	{
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 		.procname	= "msgmni",
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@@ -146,8 +165,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.msg_ctlmni),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= &ipc_mni,
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 	},
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 	{
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 		.procname	= "auto_msgmni",
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@@ -155,8 +174,8 @@
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 		.maxlen		= sizeof(int),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_auto_msgmni,
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-		.extra1		= &zero,
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-		.extra2		= &one,
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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	=  "msgmnb",
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@@ -164,15 +183,15 @@
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 		.maxlen		= sizeof(init_ipc_ns.msg_ctlmnb),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= SYSCTL_INT_MAX,
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 	},
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 	{
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 		.procname	= "sem",
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 		.data		= &init_ipc_ns.sem_ctls,
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 		.maxlen		= 4*sizeof(int),
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 		.mode		= 0644,
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-		.proc_handler	= proc_ipc_dointvec,
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+		.proc_handler	= proc_ipc_sem_dointvec,
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 	},
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 #ifdef CONFIG_CHECKPOINT_RESTORE
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 	{
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@@ -181,8 +200,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= SYSCTL_INT_MAX,
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 	},
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 	{
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 		.procname	= "msg_next_id",
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@@ -190,8 +209,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= SYSCTL_INT_MAX,
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 	},
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 	{
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 		.procname	= "shm_next_id",
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@@ -199,8 +218,8 @@
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 		.maxlen		= sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
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 		.mode		= 0644,
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 		.proc_handler	= proc_ipc_dointvec_minmax,
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-		.extra1		= &zero,
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-		.extra2		= &int_max,
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+		.extra1		= SYSCTL_ZERO,
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+		.extra2		= SYSCTL_INT_MAX,
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 	},
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 #endif
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 	{}
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@@ -222,3 +241,13 @@
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 }
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 device_initcall(ipc_sysctl_init);
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+
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+static int __init ipc_mni_extend(char *str)
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+{
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+	ipc_mni = IPCMNI_EXTEND;
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+	ipc_mni_shift = IPCMNI_EXTEND_SHIFT;
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+	ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE;
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+	pr_info("IPCMNI extended to %d.\n", ipc_mni);
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+	return 0;
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+}
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+early_param("ipcmni_extend", ipc_mni_extend);