Messages in this thread Patch in this message | | | From | Xiyu Yang <> | Subject | [PATCH v2] apparmor: fix potential label refcnt leak in aa_change_profile | Date | Sun, 5 Apr 2020 13:11:55 +0800 |
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aa_change_profile() invokes aa_get_current_label(), which returns a reference of the current task's label.
According to the comment of aa_get_current_label(), the returned reference must be put with aa_put_label(). However, when the original object pointed by "label" becomes unreachable because aa_change_profile() returns or a new object is assigned to "label", reference count increased by aa_get_current_label() is not decreased, causing a refcnt leak.
Fix this by calling aa_put_label() before aa_change_profile() return and dropping unnecessary aa_get_current_label().
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> --- Changes in v2: - Remove unnecessary aa_get_current_label() because it gets called earlier in the fn --- security/apparmor/domain.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index 6ceb74e0f789..a84ef030fbd7 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -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 */ -- 2.7.4
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