From e4e8536f65b51ce91c30588b0925872bdfc60d03 Mon Sep 17 00:00:00 2001 From: Paul Moore Date: Wed, 29 May 2013 07:36:32 +0000 Subject: [PATCH] selinux: fix the labeled xfrm/IPsec reference count handling The SELinux labeled IPsec code was improperly handling its reference counting, dropping a reference on a delete operation instead of on a free/release operation. Reported-by: Ondrej Moris Signed-off-by: Paul Moore Signed-off-by: David S. Miller --- security/selinux/xfrm.c | 34 ++++++++++++++-------------------- 1 file changed, 14 insertions(+), 20 deletions(-) diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c index 8ab295154517..d03081886214 100644 --- a/security/selinux/xfrm.c +++ b/security/selinux/xfrm.c @@ -316,6 +316,7 @@ int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, memcpy(new_ctx, old_ctx, sizeof(*new_ctx)); memcpy(new_ctx->ctx_str, old_ctx->ctx_str, new_ctx->ctx_len); + atomic_inc(&selinux_xfrm_refcount); *new_ctxp = new_ctx; } return 0; @@ -326,6 +327,7 @@ int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, */ void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx) { + atomic_dec(&selinux_xfrm_refcount); kfree(ctx); } @@ -335,17 +337,13 @@ void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx) int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) { const struct task_security_struct *tsec = current_security(); - int rc = 0; - if (ctx) { - rc = avc_has_perm(tsec->sid, ctx->ctx_sid, - SECCLASS_ASSOCIATION, - ASSOCIATION__SETCONTEXT, NULL); - if (rc == 0) - atomic_dec(&selinux_xfrm_refcount); - } + if (!ctx) + return 0; - return rc; + return avc_has_perm(tsec->sid, ctx->ctx_sid, + SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT, + NULL); } /* @@ -370,8 +368,8 @@ int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uct */ void selinux_xfrm_state_free(struct xfrm_state *x) { - struct xfrm_sec_ctx *ctx = x->security; - kfree(ctx); + atomic_dec(&selinux_xfrm_refcount); + kfree(x->security); } /* @@ -381,17 +379,13 @@ int selinux_xfrm_state_delete(struct xfrm_state *x) { const struct task_security_struct *tsec = current_security(); struct xfrm_sec_ctx *ctx = x->security; - int rc = 0; - if (ctx) { - rc = avc_has_perm(tsec->sid, ctx->ctx_sid, - SECCLASS_ASSOCIATION, - ASSOCIATION__SETCONTEXT, NULL); - if (rc == 0) - atomic_dec(&selinux_xfrm_refcount); - } + if (!ctx) + return 0; - return rc; + return avc_has_perm(tsec->sid, ctx->ctx_sid, + SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT, + NULL); } /*