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Vegard Nossum
30a46a4647
When proc_pid_attr_write() was changed to use memdup_user apparmor's
(interface violating) assumption that the setprocattr buffer was always
a single page was violated.
The size test is not strictly speaking needed as proc_pid_attr_write()
will reject anything larger, but for the sake of robustness we can keep
it in.
SMACK and SELinux look safe to me, but somebody else should probably
have a look just in case.
Based on original patch from Vegard Nossum <[email protected]>
modified for the case that apparmor provides null termination.
Fixes: bb646cdb12
Reported-by: Vegard Nossum <[email protected]>
Cc: Al Viro <[email protected]>
Cc: John Johansen <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: Eric Paris <[email protected]>
Cc: Casey Schaufler <[email protected]>
Cc: [email protected]
Signed-off-by: John Johansen <[email protected]>
Reviewed-by: Tyler Hicks <[email protected]>
Signed-off-by: James Morris <[email protected]>