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Subject[PATCH][2/5] Sysctl for proc
Date
From
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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