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authorDenys Vlasenko <vda.linux@googlemail.com>2009-07-02 10:04:50 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-07-02 10:04:50 (GMT)
commitcf4e503875814ce6e4ff8666fb4a0350ca72c6e4 (patch)
tree0ceea8f27a73df6ea0b137c92ba467c21ddbae06
parent7d5ddf14a3ce2b9c3e8251e40d67333b13287a15 (diff)
downloadbusybox-cf4e503875814ce6e4ff8666fb4a0350ca72c6e4.tar.gz
busybox-cf4e503875814ce6e4ff8666fb4a0350ca72c6e4.tar.bz2
Added kernel patch for /proc/self/exe to examples
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-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;