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973f911f55
All users of exec_domain are gone, now we can get rid of that abandoned feature. To not break existing userspace we keep a dummy /proc/execdomains file which will always contain "0-0 Linux [kernel]". Signed-off-by: Richard Weinberger <richard@nod.at>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* Handling of different ABIs (personalities).
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*
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* We group personalities into execution domains which have their
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* own handlers for kernel entry points, signal mapping, etc...
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*
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* 2001-05-06 Complete rewrite, Christoph Hellwig (hch@infradead.org)
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/sysctl.h>
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#include <linux/types.h>
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#include <linux/fs_struct.h>
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static void default_handler(int, struct pt_regs *);
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static unsigned long ident_map[32] = {
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31
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};
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struct exec_domain default_exec_domain = {
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.name = "Linux", /* name */
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.handler = default_handler, /* lcall7 causes a seg fault. */
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.pers_low = 0, /* PER_LINUX personality. */
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.pers_high = 0, /* PER_LINUX personality. */
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.signal_map = ident_map, /* Identity map signals. */
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.signal_invmap = ident_map, /* - both ways. */
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};
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static void
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default_handler(int segment, struct pt_regs *regp)
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{
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set_personality(0);
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if (current_thread_info()->exec_domain->handler != default_handler)
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current_thread_info()->exec_domain->handler(segment, regp);
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else
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send_sig(SIGSEGV, current, 1);
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}
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int __set_personality(unsigned int personality)
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{
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current->personality = personality;
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return 0;
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}
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EXPORT_SYMBOL(__set_personality);
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#ifdef CONFIG_PROC_FS
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static int execdomains_proc_show(struct seq_file *m, void *v)
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{
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seq_puts(m, "0-0\tLinux \t[kernel]\n");
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return 0;
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}
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static int execdomains_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, execdomains_proc_show, NULL);
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}
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static const struct file_operations execdomains_proc_fops = {
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.open = execdomains_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init proc_execdomains_init(void)
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{
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proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
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return 0;
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}
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module_init(proc_execdomains_init);
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#endif
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SYSCALL_DEFINE1(personality, unsigned int, personality)
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{
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unsigned int old = current->personality;
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if (personality != 0xffffffff)
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set_personality(personality);
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return old;
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}
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