diff options
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 874e813e40c8..d7ffdc59816a 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1434,7 +1434,8 @@ void register_sysctl_root(struct ctl_table_root *root) #ifdef CONFIG_SYSCTL_SYSCALL /* Perform the actual read/write of a sysctl table entry. */ -static int do_sysctl_strategy(struct ctl_table *table, +static int do_sysctl_strategy(struct ctl_table_root *root, + struct ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen) @@ -1445,7 +1446,7 @@ static int do_sysctl_strategy(struct ctl_table *table, op |= 004; if (newval) op |= 002; - if (sysctl_perm(table, op)) + if (sysctl_perm(root, table, op)) return -EPERM; if (table->strategy) { @@ -1471,6 +1472,7 @@ static int do_sysctl_strategy(struct ctl_table *table, static int parse_table(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen, + struct ctl_table_root *root, struct ctl_table *table) { int n; @@ -1485,14 +1487,14 @@ repeat: if (n == table->ctl_name) { int error; if (table->child) { - if (sysctl_perm(table, 001)) + if (sysctl_perm(root, table, 001)) return -EPERM; name++; nlen--; table = table->child; goto repeat; } - error = do_sysctl_strategy(table, name, nlen, + error = do_sysctl_strategy(root, table, name, nlen, oldval, oldlenp, newval, newlen); return error; @@ -1518,7 +1520,8 @@ int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *ol for (head = sysctl_head_next(NULL); head; head = sysctl_head_next(head)) { error = parse_table(name, nlen, oldval, oldlenp, - newval, newlen, head->ctl_table); + newval, newlen, + head->root, head->ctl_table); if (error != -ENOTDIR) { sysctl_head_finish(head); break; @@ -1564,13 +1567,21 @@ static int test_perm(int mode, int op) return -EACCES; } -int sysctl_perm(struct ctl_table *table, int op) +int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) { int error; + int mode; + error = security_sysctl(table, op); if (error) return error; - return test_perm(table->mode, op); + + if (root->permissions) + mode = root->permissions(root, current->nsproxy, table); + else + mode = table->mode; + + return test_perm(mode, op); } static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |