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+ Bug Fixes 

- Fix use-after-free in aa_audit_rule_init
   - Fix refcnt leak in policy_update
   - Fix potential label refcnt leak in aa_change_profile
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Merge tag 'apparmor-pr-2020-05-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

Pull apparmor bug fixes from John Johansen:

 - Fix use-after-free in aa_audit_rule_init

 - Fix refcnt leak in policy_update

 - Fix potential label refcnt leak in aa_change_profile

* tag 'apparmor-pr-2020-05-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
  apparmor: Fix use-after-free in aa_audit_rule_init
  apparmor: Fix aa_label refcnt leak in policy_update
  apparmor: fix potential label refcnt leak in aa_change_profile
This commit is contained in:
Linus Torvalds 2020-05-21 16:43:35 -07:00
parent 907fa89325 c54d481d71
commit 051143e160
3 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
security/apparmor/apparmorfs.c
View File

@ -454,7 +454,7 @@ static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
*/
error = aa_may_manage_policy(label, ns, mask);
if (error)
return error;
goto end_section;
data = aa_simple_write_to_buffer(buf, size, size, pos);
error = PTR_ERR(data);
@ -462,6 +462,7 @@ static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
error = aa_replace_profiles(ns, label, mask, data);
aa_put_loaddata(data);
}
end_section:
end_current_label_crit_section(label);
return error;

3
security/apparmor/audit.c
View File

@ -197,8 +197,9 @@ int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
GFP_KERNEL, true, false);
if (IS_ERR(rule->label)) {
int err = PTR_ERR(rule->label);
aa_audit_rule_free(rule);
return PTR_ERR(rule->label);
return err;
}
*vrule = rule;

3
security/apparmor/domain.c
View File

@ -1328,6 +1328,7 @@ int aa_change_profile(const char *fqname, int flags)
ctx->nnp = aa_get_label(label);
if (!fqname || !*fqname) {
aa_put_label(label);
AA_DEBUG("no profile name");
return -EINVAL;
}
@ -1346,8 +1347,6 @@ int aa_change_profile(const char *fqname, int flags)
op = OP_CHANGE_PROFILE;
}
label = aa_get_current_label();
if (*fqname == '&') {
stack = true;
/* don't have label_parse() do stacking */