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    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/examples/linux-2.6.30_proc_self_exe.patch

    Contents of /trunk/mkinitrd-magellan/busybox/examples/linux-2.6.30_proc_self_exe.patch

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File size: 966 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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;