diff options
Diffstat (limited to 'kernel/exec_domain.c')
-rw-r--r-- | kernel/exec_domain.c | 137 |
1 files changed, 1 insertions, 136 deletions
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c index 83d4382f5699..6873bb3e6b7e 100644 --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c | |||
@@ -20,145 +20,10 @@ | |||
20 | #include <linux/types.h> | 20 | #include <linux/types.h> |
21 | #include <linux/fs_struct.h> | 21 | #include <linux/fs_struct.h> |
22 | 22 | ||
23 | |||
24 | static void default_handler(int, struct pt_regs *); | ||
25 | |||
26 | static struct exec_domain *exec_domains = &default_exec_domain; | ||
27 | static DEFINE_RWLOCK(exec_domains_lock); | ||
28 | |||
29 | |||
30 | static unsigned long ident_map[32] = { | ||
31 | 0, 1, 2, 3, 4, 5, 6, 7, | ||
32 | 8, 9, 10, 11, 12, 13, 14, 15, | ||
33 | 16, 17, 18, 19, 20, 21, 22, 23, | ||
34 | 24, 25, 26, 27, 28, 29, 30, 31 | ||
35 | }; | ||
36 | |||
37 | struct exec_domain default_exec_domain = { | ||
38 | .name = "Linux", /* name */ | ||
39 | .handler = default_handler, /* lcall7 causes a seg fault. */ | ||
40 | .pers_low = 0, /* PER_LINUX personality. */ | ||
41 | .pers_high = 0, /* PER_LINUX personality. */ | ||
42 | .signal_map = ident_map, /* Identity map signals. */ | ||
43 | .signal_invmap = ident_map, /* - both ways. */ | ||
44 | }; | ||
45 | |||
46 | |||
47 | static void | ||
48 | default_handler(int segment, struct pt_regs *regp) | ||
49 | { | ||
50 | set_personality(0); | ||
51 | |||
52 | if (current_thread_info()->exec_domain->handler != default_handler) | ||
53 | current_thread_info()->exec_domain->handler(segment, regp); | ||
54 | else | ||
55 | send_sig(SIGSEGV, current, 1); | ||
56 | } | ||
57 | |||
58 | static struct exec_domain * | ||
59 | lookup_exec_domain(unsigned int personality) | ||
60 | { | ||
61 | unsigned int pers = personality(personality); | ||
62 | struct exec_domain *ep; | ||
63 | |||
64 | read_lock(&exec_domains_lock); | ||
65 | for (ep = exec_domains; ep; ep = ep->next) { | ||
66 | if (pers >= ep->pers_low && pers <= ep->pers_high) | ||
67 | if (try_module_get(ep->module)) | ||
68 | goto out; | ||
69 | } | ||
70 | |||
71 | #ifdef CONFIG_MODULES | ||
72 | read_unlock(&exec_domains_lock); | ||
73 | request_module("personality-%d", pers); | ||
74 | read_lock(&exec_domains_lock); | ||
75 | |||
76 | for (ep = exec_domains; ep; ep = ep->next) { | ||
77 | if (pers >= ep->pers_low && pers <= ep->pers_high) | ||
78 | if (try_module_get(ep->module)) | ||
79 | goto out; | ||
80 | } | ||
81 | #endif | ||
82 | |||
83 | ep = &default_exec_domain; | ||
84 | out: | ||
85 | read_unlock(&exec_domains_lock); | ||
86 | return ep; | ||
87 | } | ||
88 | |||
89 | int | ||
90 | register_exec_domain(struct exec_domain *ep) | ||
91 | { | ||
92 | struct exec_domain *tmp; | ||
93 | int err = -EBUSY; | ||
94 | |||
95 | if (ep == NULL) | ||
96 | return -EINVAL; | ||
97 | |||
98 | if (ep->next != NULL) | ||
99 | return -EBUSY; | ||
100 | |||
101 | write_lock(&exec_domains_lock); | ||
102 | for (tmp = exec_domains; tmp; tmp = tmp->next) { | ||
103 | if (tmp == ep) | ||
104 | goto out; | ||
105 | } | ||
106 | |||
107 | ep->next = exec_domains; | ||
108 | exec_domains = ep; | ||
109 | err = 0; | ||
110 | |||
111 | out: | ||
112 | write_unlock(&exec_domains_lock); | ||
113 | return err; | ||
114 | } | ||
115 | EXPORT_SYMBOL(register_exec_domain); | ||
116 | |||
117 | int | ||
118 | unregister_exec_domain(struct exec_domain *ep) | ||
119 | { | ||
120 | struct exec_domain **epp; | ||
121 | |||
122 | epp = &exec_domains; | ||
123 | write_lock(&exec_domains_lock); | ||
124 | for (epp = &exec_domains; *epp; epp = &(*epp)->next) { | ||
125 | if (ep == *epp) | ||
126 | goto unregister; | ||
127 | } | ||
128 | write_unlock(&exec_domains_lock); | ||
129 | return -EINVAL; | ||
130 | |||
131 | unregister: | ||
132 | *epp = ep->next; | ||
133 | ep->next = NULL; | ||
134 | write_unlock(&exec_domains_lock); | ||
135 | return 0; | ||
136 | } | ||
137 | EXPORT_SYMBOL(unregister_exec_domain); | ||
138 | |||
139 | int __set_personality(unsigned int personality) | ||
140 | { | ||
141 | struct exec_domain *oep = current_thread_info()->exec_domain; | ||
142 | |||
143 | current_thread_info()->exec_domain = lookup_exec_domain(personality); | ||
144 | current->personality = personality; | ||
145 | module_put(oep->module); | ||
146 | |||
147 | return 0; | ||
148 | } | ||
149 | EXPORT_SYMBOL(__set_personality); | ||
150 | |||
151 | #ifdef CONFIG_PROC_FS | 23 | #ifdef CONFIG_PROC_FS |
152 | static int execdomains_proc_show(struct seq_file *m, void *v) | 24 | static int execdomains_proc_show(struct seq_file *m, void *v) |
153 | { | 25 | { |
154 | struct exec_domain *ep; | 26 | seq_puts(m, "0-0\tLinux \t[kernel]\n"); |
155 | |||
156 | read_lock(&exec_domains_lock); | ||
157 | for (ep = exec_domains; ep; ep = ep->next) | ||
158 | seq_printf(m, "%d-%d\t%-16s\t[%s]\n", | ||
159 | ep->pers_low, ep->pers_high, ep->name, | ||
160 | module_name(ep->module)); | ||
161 | read_unlock(&exec_domains_lock); | ||
162 | return 0; | 27 | return 0; |
163 | } | 28 | } |
164 | 29 | ||