481221775d
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:
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|---|---|---|
| .. | ||
| bpf.c | ||
| bus.c | ||
| dev.c | ||
| ethtool.c | ||
| fib.c | ||
| health.c | ||
| ipsec.c | ||
| Makefile | ||
| netdev.c | ||
| netdevsim.h | ||
| psample.c | ||
| udp_tunnels.c | ||