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apparmor: provide userspace flag indicating binfmt_elf_mmap change 

Commit 9f834ec18d ("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>
zero-colors
John Johansen 2017-01-16 00:42:43 -08:00
parent 11c236b89d
commit 34c426acb7
1 changed files with 1 additions and 0 deletions
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security/apparmor/apparmorfs.c
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@ -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),
{ }
};