linux-kernel - Re: Patch: Hide process info from other users/users not in my group

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Message-ID: <47440F2B.2030402@itamservices.de>
Date:	Wed, 21 Nov 2007 11:57:47 +0100
From:	Daniel Reichelt <nl@...mservices.de>
To:	Johannes Weiner <hannes-kernel@...urebad.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Patch: Hide process info from other users/users not in my group

Hi,

sorry, I messed up the #ifdef directives (confused them with C++...). Here's
the really working patch:

--- linux-2.6.23.8/fs/Kconfig   2007-11-16 19:14:27.000000000 +0100
+++ linux-2.6.23.8-dhr/fs/Kconfig       2007-11-20 19:54:54.000000000 +0100
@@ -918,6 +918,36 @@
         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
--- linux-2.6.23.8/fs/proc/base.c       2007-11-16 19:14:27.000000000 +0100
+++ linux-2.6.23.8-dhr/fs/proc/base.c   2007-11-21 10:44:17.000000000 +0100
@@ -2200,7 +2200,13 @@
        if (!inode)
                goto out;

+#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;

--
Daniel
-
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