apparmor: provide userspace flag indicating binfmt_elf_mmap change

Commit 9f834ec18def ("binfmt_elf: switch to new creds when switching to new mm")
changed when the creds are installed by the binfmt_elf handler. This
affects which creds are used to mmap the executable into the address
space. Which can have an affect on apparmor policy.

Add a flag to apparmor at
/sys/kernel/security/apparmor/features/domain/fix_binfmt_elf_mmap

to make it possible to detect this semantic change so that the userspace
tools and the regression test suite can correctly deal with the change.

BugLink: http://bugs.launchpad.net/bugs/1630069
Signed-off-by: John Johansen <john.johansen@canonical.com>

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 49a5122..5c000cb 100644 (file)
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -796,6 +796,7 @@ static struct aa_fs_entry aa_fs_entry_domain[] = {
        AA_FS_FILE_BOOLEAN("change_hatv",       1),
        AA_FS_FILE_BOOLEAN("change_onexec",     1),
        AA_FS_FILE_BOOLEAN("change_profile",    1),
+       AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap",       1),
        { }
 };