From: Haimin Zhang <tcs.kernel@xxxxxxxxx>
[ Upstream commit 481221775d53d6215a6e5e9ce1cce6d2b4ab9a46 ]
Zero-initialize memory for new map's value in function nsim_bpf_map_alloc
since it may cause a potential kernel information leak issue, as follows:
1. nsim_bpf_map_alloc calls nsim_map_alloc_elem to allocate elements for
a new map.
2. nsim_map_alloc_elem uses kmalloc to allocate map's value, but doesn't
zero it.
3. A user application can use IOCTL BPF_MAP_LOOKUP_ELEM to get specific
element's information in the map.
4. The kernel function map_lookup_elem will call bpf_map_copy_value to get
the information allocated at step-2, then use copy_to_user to copy to the
user buffer.
This can only leak information for an array map.
Fixes: 395cacb5f1a0 ("netdevsim: bpf: support fake map offload")
Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Acked-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Haimin Zhang <tcs.kernel@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211215111530.72103-1-tcs.kernel@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/netdevsim/bpf.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index 2b74425822ab1..e0a4acc6144bf 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -510,6 +510,7 @@ nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
goto err_free;
key = nmap->entry[i].key;
*key = i;
+ memset(nmap->entry[i].value, 0, offmap->map.value_size);
}
}
--
2.33.0
