diff -u8 -r linux-2.6.24.5/fs/Kconfig linux-2.6.24.5-prochide/fs/Kconfig
--- linux-2.6.24.5/fs/Kconfig	2008-04-19 03:53:39.000000000 +0200
+++ linux-2.6.24.5-prochide/fs/Kconfig	2008-04-24 11:59:53.000000000 +0200
@@ -941,16 +941,46 @@
 
 config PROC_VMCORE
         bool "/proc/vmcore support (EXPERIMENTAL)"
         depends on PROC_FS && EXPERIMENTAL && CRASH_DUMP
 	default y
         help
         Exports the dump image of crashed kernel in ELF format.
 
+choice
+       prompt "Restrict access to /proc/<pid>-dirs"
+       default PROC_PIDDIRS_UNRESTRICTED
+config PROC_PIDDIRS_UNRESTRICTED
+       bool "no restriction"
+       depends on PROC_FS
+       help
+         Don't restrict access to /proc/<pid>-dirs, i.e. leave mode at 555
+         respectively r-xr-xr-x . This is the traditional mode of operation.
+
+         If unsure, say Y.
+config PROC_PIDDIRS_RESTRICT_TO_UG
+       bool "restrict to user and group
+       depends on PROC_FS
+       help
+         Restrict access to /proc/<pid>-dirs to user and group, i.e. set mode
+         to 550 respectively r-xr-x--- .
+
+         If unsure, say N.
+
+config PROC_PIDDIRS_RESTRICT_TO_U
+       bool "restrict to user
+       depends on PROC_FS
+       help
+         Restrict access to /proc/<pid>-dirs to user only, i.e. set mode to
+         500 respectively r-x------ .
+
+         If unsure, say N.
+endchoice
+
 config PROC_SYSCTL
 	bool "Sysctl support (/proc/sys)" if EMBEDDED
 	depends on PROC_FS
 	select SYSCTL
 	default y
 	---help---
 	  The sysctl interface provides a means of dynamically changing
 	  certain kernel parameters and variables on the fly without requiring
diff -u8 -r linux-2.6.24.5/fs/proc/base.c linux-2.6.24.5-prochide/fs/proc/base.c
--- linux-2.6.24.5/fs/proc/base.c	2008-04-19 03:53:39.000000000 +0200
+++ linux-2.6.24.5-prochide/fs/proc/base.c	2008-04-24 11:59:53.000000000 +0200
@@ -2373,17 +2373,24 @@
 {
 	struct dentry *error = ERR_PTR(-ENOENT);
 	struct inode *inode;
 
 	inode = proc_pid_make_inode(dir->i_sb, task);
 	if (!inode)
 		goto out;
 
-	inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
+	#if defined CONFIG_PROC_PIDDIRS_UNRESTRICTED
+		inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
+	#elif defined CONFIG_PROC_PIDDIRS_RESTRICT_TO_UG
+		inode->i_mode = S_IFDIR|S_IRUSR|S_IRGRP|S_IXUSR|S_IXGRP;
+	#elif defined CONFIG_PROC_PIDDIRS_RESTRICT_TO_U
+		inode->i_mode = S_IFDIR|S_IRUSR|S_IXUSR;
+	#endif
+
 	inode->i_op = &proc_tgid_base_inode_operations;
 	inode->i_fop = &proc_tgid_base_operations;
 	inode->i_flags|=S_IMMUTABLE;
 	inode->i_nlink = 5;
 #ifdef CONFIG_SECURITY
 	inode->i_nlink += 1;
 #endif