Add an array to store file permission settings in and add an example
sysctl (proc.cmdline). It can already be set and read, but it has no
effect, yet.
diff -pur l1/fs/proc/base.c l2/fs/proc/base.c
--- l1/fs/proc/base.c 2005-03-19 01:28:47.000000000 +0100
+++ l2/fs/proc/base.c 2005-03-19 19:50:37.000000000 +0100
@@ -227,6 +227,13 @@ static struct pid_entry tid_attr_stuff[]
#undef E
+#ifdef CONFIG_SYSCTL
+/* Order and number of elements must match CTL_PROC table in sysctl.h! */
+mode_t proc_base_permissions[] = {
+ S_IRUGO, /* PROC_CMDLINE */
+};
+#endif /* CONFIG_SYSCTL */
+
static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct
vfsmount **mnt)
{
struct task_struct *task = proc_task(inode);
diff -pur l1/include/linux/sysctl.h l2/include/linux/sysctl.h
--- l1/include/linux/sysctl.h 2005-03-19 19:49:43.000000000 +0100
+++ l2/include/linux/sysctl.h 2005-03-19 19:49:53.000000000 +0100
@@ -654,6 +654,9 @@ enum {
};
/* CTL_PROC names: */
+enum {
+ PROC_CMDLINE = 1,
+};
/* CTL_FS names: */
enum
diff -pur l1/kernel/sysctl.c l2/kernel/sysctl.c
--- l1/kernel/sysctl.c 2005-03-19 19:49:43.000000000 +0100
+++ l2/kernel/sysctl.c 2005-03-19 19:49:53.000000000 +0100
@@ -168,6 +168,10 @@ extern struct proc_dir_entry *proc_sys_r
static void register_proc_table(ctl_table *, struct proc_dir_entry *);
static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
+
+extern mode_t proc_base_permissions[];
+
+static int mode_r_ugo = S_IRUGO;
#endif
/* The default sysctl tables: */
@@ -840,6 +844,16 @@ static ctl_table vm_table[] = {
};
static ctl_table proc_table[] = {
+#ifdef CONFIG_PROC_FS
+ {
+ .ctl_name = PROC_CMDLINE,
+ .procname = "cmdline",
+ .data = &proc_base_permissions[PROC_CMDLINE-1],
+ .mode = 0644,
+ .proc_handler = &proc_domode,
+ .extra1 = &mode_r_ugo,
+ },
+#endif
{ .ctl_name = 0 }
};
-
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