1This patch makes /proc/self/exe executable even if proc
2is not mounted. It is especially useful on NOMMU arches.
3
4diff -urp ../linux-2.6.30.org/fs/exec.c linux-2.6.30/fs/exec.c
5--- ../linux-2.6.30.org/fs/exec.c	2009-06-10 05:05:27.000000000 +0200
6+++ linux-2.6.30/fs/exec.c	2009-06-25 00:20:13.000000000 +0200
7@@ -652,9 +652,25 @@ struct file *open_exec(const char *name)
8 	file = do_filp_open(AT_FDCWD, name,
9 				O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
10 				MAY_EXEC | MAY_OPEN);
11-	if (IS_ERR(file))
12-		goto out;
13+	if (IS_ERR(file)) {
14+		if ((PTR_ERR(file) == -ENOENT || PTR_ERR(file) == -EACCES)
15+		 && strcmp(name, "/proc/self/exe") == 0
16+		) {
17+			struct file *sv = file;
18+			struct mm_struct *mm;
19 
20+			mm = get_task_mm(current);
21+			if (!mm)
22+				goto out;
23+			file = get_mm_exe_file(mm);
24+			mmput(mm);
25+			if (file)
26+				goto ok;
27+			file = sv;
28+		}
29+		goto out;
30+	}
31+ok:
32 	err = -EACCES;
33 	if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
34 		goto exit;
35