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selinux: fix the labeled xfrm/IPsec reference count handling

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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 <omoris@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore 2013-05-29 07:36:32 +00:00 • committed by David S. Miller
parent e4c1721642
commit e4e8536f65
1 changed files with 14 additions and 20 deletions

34
security/selinux/xfrm.c
View file

@ -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, old_ctx, sizeof(*new_ctx));
memcpy(new_ctx->ctx_str, old_ctx->ctx_str, new_ctx->ctx_len); memcpy(new_ctx->ctx_str, old_ctx->ctx_str, new_ctx->ctx_len);
atomic_inc(&selinux_xfrm_refcount);
*new_ctxp = new_ctx; *new_ctxp = new_ctx;
} }
return 0; 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) void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
{ {
atomic_dec(&selinux_xfrm_refcount);
kfree(ctx); 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) int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{ {
const struct task_security_struct *tsec = current_security(); const struct task_security_struct *tsec = current_security();
int rc = 0;
if (ctx) { if (!ctx)
rc = avc_has_perm(tsec->sid, ctx->ctx_sid, return 0;
SECCLASS_ASSOCIATION,
ASSOCIATION__SETCONTEXT, NULL);
if (rc == 0)
atomic_dec(&selinux_xfrm_refcount);
}
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) void selinux_xfrm_state_free(struct xfrm_state *x)
{ {
struct xfrm_sec_ctx *ctx = x->security; atomic_dec(&selinux_xfrm_refcount);
kfree(ctx); kfree(x->security);
} }
/* /*
@ -381,17 +379,13 @@ int selinux_xfrm_state_delete(struct xfrm_state *x)
{ {
const struct task_security_struct *tsec = current_security(); const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = x->security; struct xfrm_sec_ctx *ctx = x->security;
int rc = 0;
if (ctx) { if (!ctx)
rc = avc_has_perm(tsec->sid, ctx->ctx_sid, return 0;
SECCLASS_ASSOCIATION,
ASSOCIATION__SETCONTEXT, NULL);
if (rc == 0)
atomic_dec(&selinux_xfrm_refcount);
}
return rc; return avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION, ASSOCIATION__SETCONTEXT,
NULL);
} }
/* /*