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-rw-r--r--examples/linux-2.6.30_proc_self_exe.patch34
1 files changed, 34 insertions, 0 deletions
diff --git a/examples/linux-2.6.30_proc_self_exe.patch b/examples/linux-2.6.30_proc_self_exe.patch
new file mode 100644
index 0000000..a36581b
--- /dev/null
+++ b/examples/linux-2.6.30_proc_self_exe.patch
@@ -0,0 +1,34 @@
+This patch makes /proc/self/exe executable even if proc
+is not mounted. It is especially useful on NOMMU arches.
+
+diff -urp ../linux-2.6.30.org/fs/exec.c linux-2.6.30/fs/exec.c
+--- ../linux-2.6.30.org/fs/exec.c 2009-06-10 05:05:27.000000000 +0200
++++ linux-2.6.30/fs/exec.c 2009-06-25 00:20:13.000000000 +0200
+@@ -652,9 +652,25 @@ struct file *open_exec(const char *name)
+ file = do_filp_open(AT_FDCWD, name,
+ O_LARGEFILE | O_RDONLY | FMODE_EXEC, 0,
+ MAY_EXEC | MAY_OPEN);
+- if (IS_ERR(file))
+- goto out;
++ if (IS_ERR(file)) {
++ if ((PTR_ERR(file) == -ENOENT || PTR_ERR(file) == -EACCES)
++ && strcmp(name, "/proc/self/exe") == 0
++ ) {
++ struct file *sv = file;
++ struct mm_struct *mm;
+
++ mm = get_task_mm(current);
++ if (!mm)
++ goto out;
++ file = get_mm_exe_file(mm);
++ mmput(mm);
++ if (file)
++ goto ok;
++ file = sv;
++ }
++ goto out;
++ }
++ok:
+ err = -EACCES;
+ if (!S_ISREG(file->f_path.dentry->d_inode->i_mode))
+ goto exit;