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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | /* | |
3 | * Handling of different ABIs (personalities). | |
4 | * | |
5 | * We group personalities into execution domains which have their | |
6 | * own handlers for kernel entry points, signal mapping, etc... | |
7 | * | |
8 | * 2001-05-06 Complete rewrite, Christoph Hellwig (hch@infradead.org) | |
9 | */ | |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/kmod.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/personality.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/syscalls.h> | |
20 | #include <linux/sysctl.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/fs_struct.h> | |
23 | ||
24 | #ifdef CONFIG_PROC_FS | |
25 | static int execdomains_proc_show(struct seq_file *m, void *v) | |
26 | { | |
27 | seq_puts(m, "0-0\tLinux \t[kernel]\n"); | |
28 | return 0; | |
29 | } | |
30 | ||
31 | static int execdomains_proc_open(struct inode *inode, struct file *file) | |
32 | { | |
33 | return single_open(file, execdomains_proc_show, NULL); | |
34 | } | |
35 | ||
36 | static const struct file_operations execdomains_proc_fops = { | |
37 | .open = execdomains_proc_open, | |
38 | .read = seq_read, | |
39 | .llseek = seq_lseek, | |
40 | .release = single_release, | |
41 | }; | |
42 | ||
43 | static int __init proc_execdomains_init(void) | |
44 | { | |
45 | proc_create("execdomains", 0, NULL, &execdomains_proc_fops); | |
46 | return 0; | |
47 | } | |
48 | module_init(proc_execdomains_init); | |
49 | #endif | |
50 | ||
51 | SYSCALL_DEFINE1(personality, unsigned int, personality) | |
52 | { | |
53 | unsigned int old = current->personality; | |
54 | ||
55 | if (personality != 0xffffffff) | |
56 | set_personality(personality); | |
57 | ||
58 | return old; | |
59 | } |