Hi list,
this patch sets (if the corresponding kconfig option is active) the access
modes of /proc/<pid>-dirs to 550 instead of 555 in order to provide some
privacy to users. Tools like lsof and ps to spy out on other users become
ineffective.
Cheers,
--
Daniel Reichelt
# diff -Naur linux-2.6.23.8/fs/Kconfig linux-2.6.23.8-dhr/fs/Kconfig
--- 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 11:33:18.000000000 +0100
@@ -918,6 +918,17 @@
help
Exports the dump image of crashed kernel in ELF format.
+config PROC_SECURED_PID_DIRS
+ bool "chmod /proc/<pid>-dirs to 550"
+ depends on PROC_FS
+ default n
+ help
+ chmod /proc/<pid>-dirs to 550 instead of 555 which provides a bit
+ moreprivacy to users on your system as only the user's and the user's
+ group's process details may be viewed. Other users' tasks running on
+ the system will be completely hidden from the means of utilities like
+ ps or lsof.
+
config PROC_SYSCTL
bool "Sysctl support (/proc/sys)" if EMBEDDED
depends on PROC_FS
# diff -Naur linux-2.6.23.8/fs/proc/base.c linux-2.6.23.8-dhr/fs/proc/base.c
--- 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 2007-11-20 11:31:31.000000000 +0100
@@ -2200,7 +2200,11 @@
if (!inode)
goto out;
+#ifdef CONFIG_PROC_SECURED_PID_DIRS
+ inode->i_mode = S_IFDIR|S_IRUSR|S_IRGRP|S_IXUSR|S_IXGRP;
+#else
inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
+#endif
inode->i_op = &proc_tgid_base_inode_operations;
inode->i_fop = &proc_tgid_base_operations;
inode->i_flags|=S_IMMUTABLE;
-
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