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* posix_ipc.cc (ipc_names): Rename max_len to prefix_len. Store

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the prefix len in it.
	(check_path): Take length parameter.  Use this length insetad of
	calling strlen.  Allow PATH_MAX length paths.
	(ipc_mutex_init): Use MAX_PATH instead of CYG_MAX_PATH.
	(ipc_cond_init): Ditto.
	(shm_open): Allocate local name buffer not bigger than necessary.  Call
	check_path with additional length argument.
	(shm_unlink): Ditto.
	(mq_open): Ditto.
	(mq_unlink): Ditto.
	(sem_open): Ditto.
	(sem_unlink): Ditto.
This commit is contained in:
Corinna Vinschen 2007-11-27 17:04:19 +00:00
parent a1591d3be7
commit 547ad329b6
2 changed files with 46 additions and 20 deletions
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16
winsup/cygwin/ChangeLog
View file

@ -1,3 +1,19 @@
2007-11-27 Corinna Vinschen <corinna@vinschen.de>
* posix_ipc.cc (ipc_names): Rename max_len to prefix_len. Store
the prefix len in it.
(check_path): Take length parameter. Use this length insetad of
calling strlen. Allow PATH_MAX length paths.
(ipc_mutex_init): Use MAX_PATH instead of CYG_MAX_PATH.
(ipc_cond_init): Ditto.
(shm_open): Allocate local name buffer not bigger than necessary. Call
check_path with additional length argument.
(shm_unlink): Ditto.
(mq_open): Ditto.
(mq_unlink): Ditto.
(sem_open): Ditto.
(sem_unlink): Ditto.
2007-11-27 Corinna Vinschen <corinna@vinschen.de>
Drop old SetResourceLock stuff in favor of mutos.

50
winsup/cygwin/posix_ipc.cc
View file

@ -30,15 +30,17 @@ details. */
#include <mqueue.h>
#include <semaphore.h>
/* The prefix_len is the length of the path prefix ncluding trailing "/"
(or "/sem." for semaphores) as well as the trailing NUL. */
struct
{
const char *prefix;
const size_t max_len;
const size_t prefix_len;
const char *description;
} ipc_names[] = {
{ "/dev/shm", CYG_MAX_PATH - 10, "POSIX shared memory object" },
{ "/dev/mqueue", CYG_MAX_PATH - 13, "POSIX message queue" },
{ "/dev/shm", CYG_MAX_PATH - 14, "POSIX semaphore" }
{ "/dev/shm", 10, "POSIX shared memory object" },
{ "/dev/mqueue", 13, "POSIX message queue" },
{ "/dev/shm", 14, "POSIX semaphore" }
};
enum ipc_type_t
@ -49,7 +51,7 @@ enum ipc_type_t
};
static bool
check_path (char *res_name, ipc_type_t type, const char *name)
check_path (char *res_name, ipc_type_t type, const char *name, size_t len)
{
/* Note that we require the existance of the apprpriate /dev subdirectories
for POSIX IPC object support, similar to Linux (which supports the
@ -76,7 +78,7 @@ check_path (char *res_name, ipc_type_t type, const char *name)
set_errno (EINVAL);
return false;
}
if (strlen (name) > ipc_names[type].max_len)
if (len > PATH_MAX - ipc_names[type].prefix_len)
{
debug_printf ("%s name '%s' too long", ipc_names[type].description, name);
set_errno (ENAMETOOLONG);
@ -91,7 +93,7 @@ check_path (char *res_name, ipc_type_t type, const char *name)
static int
ipc_mutex_init (HANDLE *pmtx, const char *name)
{
char buf[CYG_MAX_PATH];
char buf[MAX_PATH];
__small_sprintf (buf, "%scyg_pmtx/%s", cygheap->shared_prefix, name);
*pmtx = CreateMutex (&sec_all, FALSE, buf);
if (!*pmtx)
@ -133,7 +135,7 @@ ipc_mutex_close (HANDLE mtx)
static int
ipc_cond_init (HANDLE *pevt, const char *name)
{
char buf[CYG_MAX_PATH];
char buf[MAX_PATH];
__small_sprintf (buf, "%scyg_pevt/%s", cygheap->shared_prefix, name);
*pevt = CreateEvent (&sec_all, TRUE, FALSE, buf);
if (!*pevt)
@ -223,9 +225,10 @@ public:
extern "C" int
shm_open (const char *name, int oflag, mode_t mode)
{
char shmname[CYG_MAX_PATH];
size_t len = strlen (name);
char shmname[ipc_names[shmem].prefix_len + len];
if (!check_path (shmname, shmem, name))
if (!check_path (shmname, shmem, name, len))
return -1;
/* Check for valid flags. */
@ -243,9 +246,10 @@ shm_open (const char *name, int oflag, mode_t mode)
extern "C" int
shm_unlink (const char *name)
{
char shmname[CYG_MAX_PATH];
size_t len = strlen (name);
char shmname[ipc_names[shmem].prefix_len + len];
if (!check_path (shmname, shmem, name))
if (!check_path (shmname, shmem, name, len))
return -1;
return unlink (shmname);
@ -312,9 +316,11 @@ mq_open (const char *name, int oflag, ...)
struct mq_attr *attr;
struct mq_info *mqinfo;
LUID luid;
char mqname[CYG_MAX_PATH];
if (!check_path (mqname, mqueue, name))
size_t len = strlen (name);
char mqname[ipc_names[mqueue].prefix_len + len];
if (!check_path (mqname, mqueue, name, len))
return (mqd_t) -1;
myfault efault;
@ -870,9 +876,10 @@ mq_close (mqd_t mqd)
extern "C" int
mq_unlink (const char *name)
{
char mqname[CYG_MAX_PATH];
size_t len = strlen (name);
char mqname[ipc_names[mqueue].prefix_len + len];
if (!check_path (mqname, mqueue, name))
if (!check_path (mqname, mqueue, name, len))
return -1;
if (unlink (mqname) == -1)
return -1;
@ -901,11 +908,13 @@ sem_open (const char *name, int oflag, ...)
struct __stat64 statbuff;
sem_t *sem = SEM_FAILED;
sem_finfo sf;
char semname[CYG_MAX_PATH];
bool wasopen = false;
ipc_flock file;
if (!check_path (semname, semaphore, name))
size_t len = strlen (name);
char semname[ipc_names[semaphore].prefix_len + len];
if (!check_path (semname, semaphore, name, len))
return SEM_FAILED;
myfault efault;
@ -1041,9 +1050,10 @@ sem_close (sem_t *sem)
extern "C" int
sem_unlink (const char *name)
{
char semname[CYG_MAX_PATH];
size_t len = strlen (name);
char semname[ipc_names[semaphore].prefix_len + len];
if (!check_path (semname, semaphore, name))
if (!check_path (semname, semaphore, name, len))
return -1;
if (unlink (semname) == -1)
return -1;