linux_dsm_epyc7002/security
Kees Cook 822cceec72 mmap_min_addr check CAP_SYS_RAWIO only for write
Redirecting directly to lsm, here's the patch discussed on lkml:
http://lkml.org/lkml/2010/4/22/219

The mmap_min_addr value is useful information for an admin to see without
being root ("is my system vulnerable to kernel NULL pointer attacks?") and
its setting is trivially easy for an attacker to determine by calling
mmap() in PAGE_SIZE increments starting at 0, so trying to keep it private
has no value.

Only require CAP_SYS_RAWIO if changing the value, not reading it.

Comment from Serge :

  Me, I like to write my passwords with light blue pen on dark blue
  paper, pasted on my window - if you're going to get my password, you're
  gonna get a headache.

Signed-off-by: Kees Cook <kees.cook@canonical.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
2010-04-23 08:56:31 +10:00
..
integrity/ima IMA: include the word IMA in printk messages 2010-04-23 08:47:53 +10:00
keys security: remove dead hook key_session_to_parent 2010-04-12 12:19:18 +10:00
selinux SELinux: return error codes on policy load failure 2010-04-21 08:58:49 +10:00
smack SMACK: remove dead cred_commit hook 2010-04-08 09:20:21 +10:00
tomoyo Merge branch 'master' into next 2010-03-31 08:39:27 +11:00
capability.c security: remove dead hook acct 2010-04-12 12:19:19 +10:00
commoncap.c Security: Fix the comment of cap_file_mmap() 2010-04-20 08:47:11 +10:00
device_cgroup.c cgroups: let ss->can_attach and ss->attach do whole threadgroups at a time 2009-09-24 07:20:58 -07:00
inode.c get rid of pointless checks after simple_pin_fs() 2010-01-26 22:22:26 -05:00
Kconfig remove CONFIG_SECURITY_FILE_CAPABILITIES compile option 2009-11-24 15:06:47 +11:00
lsm_audit.c Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-12-05 15:22:26 -08:00
Makefile NOMMU: Optimise away the {dac_,}mmap_min_addr tests 2009-12-17 09:25:19 +11:00
min_addr.c mmap_min_addr check CAP_SYS_RAWIO only for write 2010-04-23 08:56:31 +10:00
security.c security: remove dead hook acct 2010-04-12 12:19:19 +10:00