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Subject[Patch] Re: Bug in 2.4.0-test9 and test10 with sys_shmat()
Date
Hi Linus,

The attached patch fixes two things:

1) shmat should not oops on shmid < 0
2) I think the shm tables should be allocated with GFP_USER instead of
GFP_KERNEL since these are user requests.

Greetings
Christoph

--- 4-11-6/ipc/shm.c Wed Oct 4 15:58:02 2000
+++ linux/ipc/shm.c Fri Nov 17 13:47:29 2000
@@ -572,13 +572,13 @@
if (pages == 0)
return NULL;

- ret = kmalloc ((dir+1) * sizeof(pte_t *), GFP_KERNEL);
+ ret = kmalloc ((dir+1) * sizeof(pte_t *), GFP_USER);
if (!ret)
goto nomem;

for (ptr = ret; ptr < ret+dir ; ptr++)
{
- *ptr = (pte_t *)__get_free_page (GFP_KERNEL);
+ *ptr = (pte_t *)__get_free_page (GFP_USER);
if (!*ptr)
goto free;
init_ptes (*ptr, PTES_PER_PAGE);
@@ -586,7 +586,7 @@

/* The last one is probably not of PAGE_SIZE: we use kmalloc */
if (last) {
- *ptr = kmalloc (last*sizeof(pte_t), GFP_KERNEL);
+ *ptr = kmalloc (last*sizeof(pte_t), GFP_USER);
if (!*ptr)
goto free;
init_ptes (*ptr, last);
@@ -724,7 +724,7 @@
struct shmid_kernel *shp;
pte_t **dir;

- shp = (struct shmid_kernel *) kmalloc (sizeof (*shp) + namelen, GFP_KERNEL);
+ shp = (struct shmid_kernel *) kmalloc (sizeof (*shp) + namelen, GFP_USER);
if (!shp)
return ERR_PTR(-ENOMEM);

@@ -1202,7 +1202,7 @@
char name[SHM_FMT_LEN+1];
void *user_addr;

- if (!shm_sb || (shmid % SEQ_MULTIPLIER) == zero_id)
+ if (!shm_sb || shmid < 0 || (shmid % SEQ_MULTIPLIER) == zero_id)
return -EINVAL;

if ((addr = (ulong)shmaddr)) {
-
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