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Smack: adds smackfs/ptrace interface

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This allows to limit ptrace beyond the regular smack access rules.
It adds a smackfs/ptrace interface that allows smack to be configured
to require equal smack labels for PTRACE_MODE_ATTACH access.
See the changes in Documentation/security/Smack.txt below for details.

Signed-off-by: Lukasz Pawelczyk <[email protected]>
Signed-off-by: Rafal Krypa <[email protected]>
This commit is contained in:
Lukasz Pawelczyk 2014-03-11 17:07:06 +01:00 • committed by Casey Schaufler
commit 6686781852
5 changed files with 118 additions and 2 deletions
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10
Documentation/security/Smack.txt
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@ -204,6 +204,16 @@ onlycap
these capabilities are effective at for processes with any
label. The value is set by writing the desired label to the
file or cleared by writing "-" to the file.
ptrace
This is used to define the current ptrace policy
0 - default: this is the policy that relies on smack access rules.
For the PTRACE_READ a subject needs to have a read access on
object. For the PTRACE_ATTACH a read-write access is required.
1 - exact: this is the policy that limits PTRACE_ATTACH. Attach is
only allowed when subject's and object's labels are equal.
PTRACE_READ is not affected. Can be overriden with CAP_SYS_PTRACE.
2 - draconian: this policy behaves like the 'exact' above with an
exception that it can't be overriden with CAP_SYS_PTRACE.
revoke-subject
Writing a Smack label here sets the access to '-' for all access
rules with that subject label.