Re: [PATCH 1/5] chelsio/l2t: Annotate struct l2t_data with __counted_by
From: Gustavo A. R. Silva <hidden>
Date: 2023-10-01 06:33:45
Also in:
linux-hardening, lkml, llvm
On 9/29/23 20:11, Kees Cook wrote:
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 l2t_data. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Raju Rangoju <redacted> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <redacted>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks -- Gustavo
quoted hunk ↗ jump to hunk
--- drivers/net/ethernet/chelsio/cxgb3/l2t.h | 2 +- drivers/net/ethernet/chelsio/cxgb4/l2t.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)diff --git a/drivers/net/ethernet/chelsio/cxgb3/l2t.h b/drivers/net/ethernet/chelsio/cxgb3/l2t.h index ea75f275023f..646ca0bc25bd 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/l2t.h +++ b/drivers/net/ethernet/chelsio/cxgb3/l2t.h@@ -76,7 +76,7 @@ struct l2t_data { atomic_t nfree; /* number of free entries */ rwlock_t lock; struct rcu_head rcu_head; /* to handle rcu cleanup */ - struct l2t_entry l2tab[]; + struct l2t_entry l2tab[] __counted_by(nentries); }; typedef void (*arp_failure_handler_func)(struct t3cdev * dev,diff --git a/drivers/net/ethernet/chelsio/cxgb4/l2t.c b/drivers/net/ethernet/chelsio/cxgb4/l2t.c index a10a6862a9a4..1e5f5b1a22a6 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/l2t.c +++ b/drivers/net/ethernet/chelsio/cxgb4/l2t.c@@ -59,7 +59,7 @@ struct l2t_data { rwlock_t lock; atomic_t nfree; /* number of free entries */ struct l2t_entry *rover; /* starting point for next allocation */ - struct l2t_entry l2tab[]; /* MUST BE LAST */ + struct l2t_entry l2tab[] __counted_by(l2t_size); /* MUST BE LAST */ }; static inline unsigned int vlan_prio(const struct l2t_entry *e)