Contents of /tags/mkinitrd-6_2_3/busybox/examples/linux-2.6.30_proc_self_exe.patch
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Revision 1054 -
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Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
File size: 966 byte(s)
Mon May 31 20:54:44 2010 UTC (14 years, 3 months ago) by niro
File size: 966 byte(s)
tagged 'mkinitrd-6_2_3'
1 | This patch makes /proc/self/exe executable even if proc |
2 | is not mounted. It is especially useful on NOMMU arches. |
3 | |
4 | diff -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; |