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net: openvswitch: Annotate struct dp_meter with __counted_by 

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct dp_meter.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: dev@openvswitch.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922172858.3822653-12-keescook@chromium.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kees Cook 2023-09-22 10:28:54 -07:00 committed by Jakub Kicinski
parent 93bc6ab6b1
commit 16ae53d80c
1 changed files with 1 additions and 1 deletions
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2
net/openvswitch/meter.h
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@ -39,7 +39,7 @@ struct dp_meter {
u32 max_delta_t;
u64 used;
struct ovs_flow_stats stats;
struct dp_meter_band bands[];
struct dp_meter_band bands[] __counted_by(n_bands);
};
struct dp_meter_instance {