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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | #include <linux/stat.h> #include <linux/sysctl.h> #include "../fs/xfs/linux-2.6/xfs_sysctl.h" #include <linux/sunrpc/debug.h> #include <linux/string.h> #include <net/ip_vs.h> static int sysctl_depth(struct ctl_table *table) { struct ctl_table *tmp; int depth; depth = 0; for (tmp = table; tmp->parent; tmp = tmp->parent) depth++; return depth; } static struct ctl_table *sysctl_parent(struct ctl_table *table, int n) { int i; for (i = 0; table && i < n; i++) table = table->parent; return table; } static void sysctl_print_path(struct ctl_table *table) { struct ctl_table *tmp; int depth, i; depth = sysctl_depth(table); if (table->procname) { for (i = depth; i >= 0; i--) { tmp = sysctl_parent(table, i); printk("/%s", tmp->procname?tmp->procname:""); } } printk(" "); } static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces, struct ctl_table *table) { struct ctl_table_header *head; struct ctl_table *ref, *test; int depth, cur_depth; depth = sysctl_depth(table); for (head = __sysctl_head_next(namespaces, NULL); head; head = __sysctl_head_next(namespaces, head)) { cur_depth = depth; ref = head->ctl_table; repeat: test = sysctl_parent(table, cur_depth); for (; ref->procname; ref++) { int match = 0; if (cur_depth && !ref->child) continue; if (test->procname && ref->procname && (strcmp(test->procname, ref->procname) == 0)) match++; if (match) { if (cur_depth != 0) { cur_depth--; ref = ref->child; goto repeat; } goto out; } } } ref = NULL; out: sysctl_head_finish(head); return ref; } static void set_fail(const char **fail, struct ctl_table *table, const char *str) { if (*fail) { printk(KERN_ERR "sysctl table check failed: "); sysctl_print_path(table); printk(" %s\n", *fail); dump_stack(); } *fail = str; } static void sysctl_check_leaf(struct nsproxy *namespaces, struct ctl_table *table, const char **fail) { struct ctl_table *ref; ref = sysctl_check_lookup(namespaces, table); if (ref && (ref != table)) set_fail(fail, table, "Sysctl already exists"); } int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table) { int error = 0; for (; table->procname; table++) { const char *fail = NULL; if (table->parent) { if (!table->parent->procname) set_fail(&fail, table, "Parent without procname"); } if (table->child) { if (table->data) set_fail(&fail, table, "Directory with data?"); if (table->maxlen) set_fail(&fail, table, "Directory with maxlen?"); if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode) set_fail(&fail, table, "Writable sysctl directory"); if (table->proc_handler) set_fail(&fail, table, "Directory with proc_handler"); if (table->extra1) set_fail(&fail, table, "Directory with extra1"); if (table->extra2) set_fail(&fail, table, "Directory with extra2"); } else { if ((table->proc_handler == proc_dostring) || (table->proc_handler == proc_dointvec) || (table->proc_handler == proc_dointvec_minmax) || (table->proc_handler == proc_dointvec_jiffies) || (table->proc_handler == proc_dointvec_userhz_jiffies) || (table->proc_handler == proc_dointvec_ms_jiffies) || (table->proc_handler == proc_doulongvec_minmax) || (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) { if (!table->data) set_fail(&fail, table, "No data"); if (!table->maxlen) set_fail(&fail, table, "No maxlen"); } #ifdef CONFIG_PROC_SYSCTL if (!table->proc_handler) set_fail(&fail, table, "No proc_handler"); #endif sysctl_check_leaf(namespaces, table, &fail); } if (table->mode > 0777) set_fail(&fail, table, "bogus .mode"); if (fail) { set_fail(&fail, table, NULL); error = -EINVAL; } if (table->child) error |= sysctl_check_table(namespaces, table->child); } return error; } |