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Cygwin: fix guard checking for current user's AuthZ context 

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2018-04-12 09:43:12 +02:00
parent 5d99256613
commit e206c39bb6
1 changed files with 7 additions and 3 deletions
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10
winsup/cygwin/sec_helper.cc
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@ -821,12 +821,16 @@ authz_ctx::get_user_attribute (mode_t *attribute, PSECURITY_DESCRIPTOR psd,
if (RtlEqualSid (user_sid, cygheap->user.sid ())
&& !cygheap->user.issetuid ())
{
/* Avoid lock in default case. */
if (!user_ctx_hdl)
{
authz_guard.acquire ();
if (!AuthzInitializeContextFromToken (0, hProcToken, authz, NULL,
authz_dummy_luid, NULL,
&user_ctx_hdl))
/* Check user_ctx_hdl again under lock to avoid overwriting
user_ctx_hdl if it has already been initialized. */
if (!user_ctx_hdl
&& !AuthzInitializeContextFromToken (0, hProcToken, authz, NULL,
authz_dummy_luid, NULL,
&user_ctx_hdl))
debug_printf ("AuthzInitializeContextFromToken, %E");
authz_guard.release ();
}