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[PATCH] IPC: access to unmapped vmalloc area in grow_ary() 

grow_ary() should not copy struct ipc_id_ary (it copies new->p, not
new). Due to this, memcpy() src pointer could hit unmapped vmalloc page
when near page boundary.

Found during OpenVZ stress testing

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Alexey Kuznetsov 2006-04-17 15:39:23 +04:00 committed by Linus Torvalds
parent 69cf0fac60
commit a9a5cd5d2a
1 changed files with 1 additions and 2 deletions
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3
ipc/util.c
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@ -183,8 +183,7 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
if(new == NULL)
return size;
new->size = newsize;
memcpy(new->p, ids->entries->p, sizeof(struct kern_ipc_perm *)*size +
sizeof(struct ipc_id_ary));
memcpy(new->p, ids->entries->p, sizeof(struct kern_ipc_perm *)*size);
for(i=size;i<newsize;i++) {
new->p[i] = NULL;
}