Hi Linus,
The following patchlet bring the handling of shmget with size zero
back to the 2.2 behaviour. There seem to be programs out, which
(erroneously) rely on this.
Greetings
Christoph
diff -uNr c/include/linux/shm.h c1/include/linux/shm.h
--- c/include/linux/shm.h Fri Dec 22 10:20:08 2000
+++ c1/include/linux/shm.h Tue Dec 26 19:52:15 2000
@@ -10,7 +10,7 @@
*/
#define SHMMAX 0x2000000 /* max shared seg size (bytes) */
-#define SHMMIN 0 /* min shared seg size (bytes) */
+#define SHMMIN 1 /* min shared seg size (bytes) */
#define SHMMNI 4096 /* max num of segs system wide */
#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
#define SHMSEG SHMMNI /* max shared segs per process */
diff -uNr c/ipc/shm.c c1/ipc/shm.c
--- c/ipc/shm.c Fri Dec 22 10:05:38 2000
+++ c1/ipc/shm.c Tue Dec 26 19:53:35 2000
@@ -179,6 +179,9 @@
char name[13];
int id;
+ if (size < SHMMIN || size > shm_ctlmax)
+ return -EINVAL;
+
if (shm_tot + numpages >= shm_ctlall)
return -ENOSPC;
@@ -222,9 +225,6 @@
{
struct shmid_kernel *shp;
int err, id = 0;
-
- if (size < SHMMIN || size > shm_ctlmax)
- return -EINVAL;
down(&shm_ids.sem);
if (key == IPC_PRIVATE) {
-
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