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| author | John Johansen <john.johansen@canonical.com> | 2012-03-27 04:14:33 -0700 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2012-03-28 01:00:05 +1100 |
| commit | 0421ea91ddc7895a5a68d3bc670ed4b8e6448a42 (patch) | |
| tree | 409b065611770dc4b69df1bb80100e001d52c36c | |
| parent | e22057c8599373e5caef0bc42bdb95d2a361ab0d (diff) | |
| download | lwn-0421ea91ddc7895a5a68d3bc670ed4b8e6448a42.tar.gz lwn-0421ea91ddc7895a5a68d3bc670ed4b8e6448a42.zip | |
apparmor: Fix change_onexec when called from a confined task
Fix failure in aa_change_onexec api when the request is made from a confined
task. This failure was caused by two problems
The AA_MAY_ONEXEC perm was not being mapped correctly for this case.
The executable name was being checked as second time instead of using the
requested onexec profile name, which may not be the same as the exec
profile name. This mistake can not be exploited to grant extra permission
because of the above flaw where the ONEXEC permission was not being mapped
so it will not be granted.
BugLink: http://bugs.launchpad.net/bugs/963756
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
| -rw-r--r-- | security/apparmor/domain.c | 3 | ||||
| -rw-r--r-- | security/apparmor/file.c | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index 7c69599a69e1..6327685c101e 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -410,7 +410,8 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) * exec\0change_profile */ state = aa_dfa_null_transition(profile->file.dfa, state); - cp = change_profile_perms(profile, cxt->onexec->ns, name, + cp = change_profile_perms(profile, cxt->onexec->ns, + cxt->onexec->base.name, AA_MAY_ONEXEC, state); if (!(cp.allow & AA_MAY_ONEXEC)) diff --git a/security/apparmor/file.c b/security/apparmor/file.c index 3022c0f4f0db..5d176f2530c9 100644 --- a/security/apparmor/file.c +++ b/security/apparmor/file.c @@ -215,6 +215,8 @@ static struct file_perms compute_perms(struct aa_dfa *dfa, unsigned int state, /* change_profile wasn't determined by ownership in old mapping */ if (ACCEPT_TABLE(dfa)[state] & 0x80000000) perms.allow |= AA_MAY_CHANGE_PROFILE; + if (ACCEPT_TABLE(dfa)[state] & 0x40000000) + perms.allow |= AA_MAY_ONEXEC; return perms; } |