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| author | Serge E. Hallyn <serue@us.ibm.com> | 2009-11-23 23:21:30 +0100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-11-24 05:06:47 +0100 |
| commit | b3a222e52e4d4be77cc4520a57af1a4a0d8222d1 (patch) | |
| tree | 1c3d5df529a404636b996ef39c991c9b8813aa12 /security/Kconfig | |
| parent | SELinux: print denials for buggy kernel with unknown perms (diff) | |
| download | linux-b3a222e52e4d4be77cc4520a57af1a4a0d8222d1.tar.xz linux-b3a222e52e4d4be77cc4520a57af1a4a0d8222d1.zip | |
remove CONFIG_SECURITY_FILE_CAPABILITIES compile option
As far as I know, all distros currently ship kernels with default
CONFIG_SECURITY_FILE_CAPABILITIES=y. Since having the option on
leaves a 'no_file_caps' option to boot without file capabilities,
the main reason to keep the option is that turning it off saves
you (on my s390x partition) 5k. In particular, vmlinux sizes
came to:
without patch fscaps=n: 53598392
without patch fscaps=y: 53603406
with this patch applied: 53603342
with the security-next tree.
Against this we must weigh the fact that there is no simple way for
userspace to figure out whether file capabilities are supported,
while things like per-process securebits, capability bounding
sets, and adding bits to pI if CAP_SETPCAP is in pE are not supported
with SECURITY_FILE_CAPABILITIES=n, leaving a bit of a problem for
applications wanting to know whether they can use them and/or why
something failed.
It also adds another subtly different set of semantics which we must
maintain at the risk of severe security regressions.
So this patch removes the SECURITY_FILE_CAPABILITIES compile
option. It drops the kernel size by about 50k over the stock
SECURITY_FILE_CAPABILITIES=y kernel, by removing the
cap_limit_ptraced_target() function.
Changelog:
Nov 20: remove cap_limit_ptraced_target() as it's logic
was ifndef'ed.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: Andrew G. Morgan" <morgan@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/Kconfig')
| -rw-r--r-- | security/Kconfig | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/security/Kconfig b/security/Kconfig index 95cc08913ca1..226b9556b25f 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -91,15 +91,6 @@ config SECURITY_PATH implement pathname based access controls. If you are unsure how to answer this question, answer N. -config SECURITY_FILE_CAPABILITIES - bool "File POSIX Capabilities" - default n - help - This enables filesystem capabilities, allowing you to give - binaries a subset of root's powers without using setuid 0. - - If in doubt, answer N. - config INTEL_TXT bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)" depends on HAVE_INTEL_TXT |