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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/kernel/sysctl.c
..
..
@@ -114,15 +114,9 @@
114
114
 static int sixty = 60;
115
115
 #endif
116
116
 
117
-static int __maybe_unused neg_one = -1;
118
-static int __maybe_unused two = 2;
119
-static int __maybe_unused four = 4;
120
117
 static unsigned long zero_ul;
121
118
 static unsigned long one_ul = 1;
122
119
 static unsigned long long_max = LONG_MAX;
123
-static int one_hundred = 100;
124
-static int two_hundred = 200;
125
-static int one_thousand = 1000;
126
120
 #ifdef CONFIG_PRINTK
127
121
 static int ten_thousand = 10000;
128
122
 #endif
..
..
@@ -1064,6 +1058,65 @@
1064
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 				 do_proc_douintvec_minmax_conv, &param);
1065
1059
 }
1066
1060
 
1061
+/**
1062
+ * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1063
+ * @table: the sysctl table
1064
+ * @write: %TRUE if this is a write to the sysctl file
1065
+ * @buffer: the user buffer
1066
+ * @lenp: the size of the user buffer
1067
+ * @ppos: file position
1068
+ *
1069
+ * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1070
+ * values from/to the user buffer, treated as an ASCII string. Negative
1071
+ * strings are not allowed.
1072
+ *
1073
+ * This routine will ensure the values are within the range specified by
1074
+ * table->extra1 (min) and table->extra2 (max).
1075
+ *
1076
+ * Returns 0 on success or an error on write when the range check fails.
1077
+ */
1078
+int proc_dou8vec_minmax(struct ctl_table *table, int write,
1079
+			void *buffer, size_t *lenp, loff_t *ppos)
1080
+{
1081
+	struct ctl_table tmp;
1082
+	unsigned int min = 0, max = 255U, val;
1083
+	u8 *data = table->data;
1084
+	struct do_proc_douintvec_minmax_conv_param param = {
1085
+		.min = &min,
1086
+		.max = &max,
1087
+	};
1088
+	int res;
1089
+
1090
+	/* Do not support arrays yet. */
1091
+	if (table->maxlen != sizeof(u8))
1092
+		return -EINVAL;
1093
+
1094
+	if (table->extra1) {
1095
+		min = *(unsigned int *) table->extra1;
1096
+		if (min > 255U)
1097
+			return -EINVAL;
1098
+	}
1099
+	if (table->extra2) {
1100
+		max = *(unsigned int *) table->extra2;
1101
+		if (max > 255U)
1102
+			return -EINVAL;
1103
+	}
1104
+
1105
+	tmp = *table;
1106
+
1107
+	tmp.maxlen = sizeof(val);
1108
+	tmp.data = &val;
1109
+	val = READ_ONCE(*data);
1110
+	res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1111
+				do_proc_douintvec_minmax_conv, &param);
1112
+	if (res)
1113
+		return res;
1114
+	if (write)
1115
+		WRITE_ONCE(*data, val);
1116
+	return 0;
1117
+}
1118
+EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1119
+
1067
1120
 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1068
1121
 					unsigned int *valp,
1069
1122
 					int write, void *data)
..
..
@@ -1615,6 +1668,12 @@
1615
1668
 	return -ENOSYS;
1616
1669
 }
1617
1670
 
1671
+int proc_dou8vec_minmax(struct ctl_table *table, int write,
1672
+			void *buffer, size_t *lenp, loff_t *ppos)
1673
+{
1674
+	return -ENOSYS;
1675
+}
1676
+
1618
1677
 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1619
1678
 		    void *buffer, size_t *lenp, loff_t *ppos)
1620
1679
 {
..
..
@@ -1964,7 +2023,7 @@
1964
2023
 		.maxlen		= sizeof(int),
1965
2024
 		.mode		= 0644,
1966
2025
 		.proc_handler	= proc_dointvec_minmax,
1967
-		.extra1		= &neg_one,
2026
+		.extra1		= SYSCTL_NEG_ONE,
1968
2027
 		.extra2		= SYSCTL_ONE,
1969
2028
 	},
1970
2029
 #endif
..
..
@@ -2218,17 +2277,6 @@
2218
2277
 		.proc_handler	= proc_dointvec,
2219
2278
 	},
2220
2279
 #endif
2221
-#ifdef CONFIG_SMP
2222
-	{
2223
-		.procname	= "oops_all_cpu_backtrace",
2224
-		.data		= &sysctl_oops_all_cpu_backtrace,
2225
-		.maxlen		= sizeof(int),
2226
-		.mode		= 0644,
2227
-		.proc_handler	= proc_dointvec_minmax,
2228
-		.extra1		= SYSCTL_ZERO,
2229
-		.extra2		= SYSCTL_ONE,
2230
-	},
2231
-#endif /* CONFIG_SMP */
2232
2280
 	{
2233
2281
 		.procname	= "pid_max",
2234
2282
 		.data		= &pid_max,
..
..
@@ -2306,7 +2354,7 @@
2306
2354
 		.mode		= 0644,
2307
2355
 		.proc_handler	= proc_dointvec_minmax_sysadmin,
2308
2356
 		.extra1		= SYSCTL_ZERO,
2309
-		.extra2		= &two,
2357
+		.extra2		= SYSCTL_TWO,
2310
2358
 	},
2311
2359
 #endif
2312
2360
 	{
..
..
@@ -2566,7 +2614,7 @@
2566
2614
 		.maxlen		= sizeof(int),
2567
2615
 		.mode		= 0644,
2568
2616
 		.proc_handler	= proc_dointvec_minmax,
2569
-		.extra1		= &neg_one,
2617
+		.extra1		= SYSCTL_NEG_ONE,
2570
2618
 	},
2571
2619
 #endif
2572
2620
 #ifdef CONFIG_RT_MUTEXES
..
..
@@ -2628,7 +2676,7 @@
2628
2676
 		.mode		= 0644,
2629
2677
 		.proc_handler	= perf_cpu_time_max_percent_handler,
2630
2678
 		.extra1		= SYSCTL_ZERO,
2631
-		.extra2		= &one_hundred,
2679
+		.extra2		= SYSCTL_ONE_HUNDRED,
2632
2680
 	},
2633
2681
 	{
2634
2682
 		.procname	= "perf_event_max_stack",
..
..
@@ -2646,7 +2694,7 @@
2646
2694
 		.mode		= 0644,
2647
2695
 		.proc_handler	= perf_event_max_stack_handler,
2648
2696
 		.extra1		= SYSCTL_ZERO,
2649
-		.extra2		= &one_thousand,
2697
+		.extra2		= SYSCTL_ONE_THOUSAND,
2650
2698
 	},
2651
2699
 #endif
2652
2700
 	{
..
..
@@ -2677,7 +2725,7 @@
2677
2725
 		.mode		= 0644,
2678
2726
 		.proc_handler	= bpf_unpriv_handler,
2679
2727
 		.extra1		= SYSCTL_ZERO,
2680
-		.extra2		= &two,
2728
+		.extra2		= SYSCTL_TWO,
2681
2729
 	},
2682
2730
 	{
2683
2731
 		.procname	= "bpf_stats_enabled",
..
..
@@ -2720,7 +2768,7 @@
2720
2768
 		.mode		= 0644,
2721
2769
 		.proc_handler	= overcommit_policy_handler,
2722
2770
 		.extra1		= SYSCTL_ZERO,
2723
-		.extra2		= &two,
2771
+		.extra2		= SYSCTL_TWO,
2724
2772
 	},
2725
2773
 	{
2726
2774
 		.procname	= "panic_on_oom",
..
..
@@ -2729,7 +2777,7 @@
2729
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 		.mode		= 0644,
2730
2778
 		.proc_handler	= proc_dointvec_minmax,
2731
2779
 		.extra1		= SYSCTL_ZERO,
2732
-		.extra2		= &two,
2780
+		.extra2		= SYSCTL_TWO,
2733
2781
 	},
2734
2782
 	{
2735
2783
 		.procname	= "oom_kill_allocating_task",
..
..
@@ -2774,7 +2822,7 @@
2774
2822
 		.mode		= 0644,
2775
2823
 		.proc_handler	= dirty_background_ratio_handler,
2776
2824
 		.extra1		= SYSCTL_ZERO,
2777
-		.extra2		= &one_hundred,
2825
+		.extra2		= SYSCTL_ONE_HUNDRED,
2778
2826
 	},
2779
2827
 	{
2780
2828
 		.procname	= "dirty_background_bytes",
..
..
@@ -2791,7 +2839,7 @@
2791
2839
 		.mode		= 0644,
2792
2840
 		.proc_handler	= dirty_ratio_handler,
2793
2841
 		.extra1		= SYSCTL_ZERO,
2794
-		.extra2		= &one_hundred,
2842
+		.extra2		= SYSCTL_ONE_HUNDRED,
2795
2843
 	},
2796
2844
 	{
2797
2845
 		.procname	= "dirty_bytes",
..
..
@@ -2831,7 +2879,7 @@
2831
2879
 		.mode		= 0644,
2832
2880
 		.proc_handler	= proc_dointvec_minmax,
2833
2881
 		.extra1		= SYSCTL_ZERO,
2834
-		.extra2		= &two_hundred,
2882
+		.extra2		= SYSCTL_TWO_HUNDRED,
2835
2883
 	},
2836
2884
 #ifdef CONFIG_NUMA
2837
2885
 	{
..
..
@@ -2890,7 +2938,7 @@
2890
2938
 		.mode		= 0200,
2891
2939
 		.proc_handler	= drop_caches_sysctl_handler,
2892
2940
 		.extra1		= SYSCTL_ONE,
2893
-		.extra2		= &four,
2941
+		.extra2		= SYSCTL_FOUR,
2894
2942
 	},
2895
2943
 #ifdef CONFIG_COMPACTION
2896
2944
 	{
..
..
@@ -2907,7 +2955,7 @@
2907
2955
 		.mode		= 0644,
2908
2956
 		.proc_handler	= compaction_proactiveness_sysctl_handler,
2909
2957
 		.extra1		= SYSCTL_ZERO,
2910
-		.extra2		= &one_hundred,
2958
+		.extra2		= SYSCTL_ONE_HUNDRED,
2911
2959
 	},
2912
2960
 	{
2913
2961
 		.procname	= "extfrag_threshold",
..
..
@@ -2952,7 +3000,7 @@
2952
3000
 		.mode		= 0644,
2953
3001
 		.proc_handler	= watermark_scale_factor_sysctl_handler,
2954
3002
 		.extra1		= SYSCTL_ONE,
2955
-		.extra2		= &one_thousand,
3003
+		.extra2		= SYSCTL_THREE_THOUSAND,
2956
3004
 	},
2957
3005
 	{
2958
3006
 		.procname	= "extra_free_kbytes",
..
..
@@ -3047,7 +3095,7 @@
3047
3095
 		.mode		= 0644,
3048
3096
 		.proc_handler	= sysctl_min_unmapped_ratio_sysctl_handler,
3049
3097
 		.extra1		= SYSCTL_ZERO,
3050
-		.extra2		= &one_hundred,
3098
+		.extra2		= SYSCTL_ONE_HUNDRED,
3051
3099
 	},
3052
3100
 	{
3053
3101
 		.procname	= "min_slab_ratio",
..
..
@@ -3056,7 +3104,7 @@
3056
3104
 		.mode		= 0644,
3057
3105
 		.proc_handler	= sysctl_min_slab_ratio_sysctl_handler,
3058
3106
 		.extra1		= SYSCTL_ZERO,
3059
-		.extra2		= &one_hundred,
3107
+		.extra2		= SYSCTL_ONE_HUNDRED,
3060
3108
 	},
3061
3109
 #endif
3062
3110
 #ifdef CONFIG_SMP
..
..
@@ -3339,7 +3387,7 @@
3339
3387
 		.mode		= 0600,
3340
3388
 		.proc_handler	= proc_dointvec_minmax,
3341
3389
 		.extra1		= SYSCTL_ZERO,
3342
-		.extra2		= &two,
3390
+		.extra2		= SYSCTL_TWO,
3343
3391
 	},
3344
3392
 	{
3345
3393
 		.procname	= "protected_regular",
..
..
@@ -3348,7 +3396,7 @@
3348
3396
 		.mode		= 0600,
3349
3397
 		.proc_handler	= proc_dointvec_minmax,
3350
3398
 		.extra1		= SYSCTL_ZERO,
3351
-		.extra2		= &two,
3399
+		.extra2		= SYSCTL_TWO,
3352
3400
 	},
3353
3401
 	{
3354
3402
 		.procname	= "suid_dumpable",
..
..
@@ -3357,7 +3405,7 @@
3357
3405
 		.mode		= 0644,
3358
3406
 		.proc_handler	= proc_dointvec_minmax_coredump,
3359
3407
 		.extra1		= SYSCTL_ZERO,
3360
-		.extra2		= &two,
3408
+		.extra2		= SYSCTL_TWO,
3361
3409
 	},
3362
3410
 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3363
3411
 	{