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| author | Stephen Smalley <sds@tycho.nsa.gov> | 2020-01-08 11:24:47 -0500 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2020-02-10 10:49:01 -0500 |
| commit | e9c38f9fc2ccd31befe1bb1605b69213483a15b7 (patch) | |
| tree | 281e142f528909787ffc92dab94acfc0593d9474 /Documentation/admin-guide/kernel-parameters.txt | |
| parent | 4b36cb773a8153417a080f8025d522322f915aea (diff) | |
| download | lwn-e9c38f9fc2ccd31befe1bb1605b69213483a15b7.tar.gz lwn-e9c38f9fc2ccd31befe1bb1605b69213483a15b7.zip | |
Documentation,selinux: deprecate setting checkreqprot to 1
Deprecate setting the SELinux checkreqprot tunable to 1 via kernel
parameter or /sys/fs/selinux/checkreqprot. Setting it to 0 is left
intact for compatibility since Android and some Linux distributions
do so for security and treat an inability to set it as a fatal error.
Eventually setting it to 0 will become a no-op and the kernel will
stop using checkreqprot's value internally altogether.
checkreqprot was originally introduced as a compatibility mechanism
for legacy userspace and the READ_IMPLIES_EXEC personality flag.
However, if set to 1, it weakens security by allowing mappings to be
made executable without authorization by policy. The default value
for the SECURITY_SELINUX_CHECKREQPROT_VALUE config option was changed
from 1 to 0 in commit 2a35d196c160e3 ("selinux: change
CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE default") and both Android
and Linux distributions began explicitly setting
/sys/fs/selinux/checkreqprot to 0 some time ago.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index dbc22d684627..ff1428d69b2d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -518,6 +518,7 @@ Default value is set via a kernel config option. Value can be changed at runtime via /sys/fs/selinux/checkreqprot. + Setting checkreqprot to 1 is deprecated. cio_ignore= [S390] See Documentation/s390/common_io.rst for details. |