kernel/exec_domain.c

   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 }