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* flock.cc (allow_others_to_sync): Use RtlGetDaclSecurityDescriptor

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rather than accessing the SECURITY_DESCRIPTOR structure directly.
	Take no DACL and NULL DACL into account.
This commit is contained in:
Corinna Vinschen
2012-03-02 17:07:17 +00:00
parent 52cbb05cfb
commit b4ad7197fb
2 changed files with 22 additions and 2 deletions
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18
winsup/cygwin/flock.cc
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@@ -176,8 +176,22 @@ allow_others_to_sync ()
/* Create a valid dacl pointer and set its size to be as big as
there's room in the temporary buffer. Note that the descriptor
is in self-relative format. */
dacl = (PACL) ((char *) sd + (uintptr_t) sd->Dacl);
dacl->AclSize = NT_MAX_PATH * sizeof (WCHAR) - ((char *) dacl - (char *) sd);
BOOLEAN present, defaulted;
RtlGetDaclSecurityDescriptor (sd, &present, &dacl, &defaulted);
if (dacl == NULL) /* Everyone has all access anyway */
{
done = true;
return;
}
else if (!present)
{
dacl = (PACL) (sd + 1);
RtlCreateAcl (dacl, MAX_PROCESS_SD_SIZE - sizeof *sd, ACL_REVISION);
}
else
{
dacl->AclSize = MAX_PROCESS_SD_SIZE - ((PBYTE) dacl - (PBYTE) sd);
}
/* Allow everyone to SYNCHRONIZE with this process. */
status = RtlAddAccessAllowedAce (dacl, ACL_REVISION, SYNCHRONIZE,
well_known_world_sid);