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Message-Id: <20230922175300.work.148-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:53:01 -0700
From: Kees Cook <keescook@...omium.org>
To: Bodo Stroesser <bostroesser@...il.com>
Cc: Kees Cook <keescook@...omium.org>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH] scsi: target: tcmu: Annotate struct tcmu_tmr 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 tcmu_tmr.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Bodo Stroesser <bostroesser@...il.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org
Cc: target-devel@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/target/target_core_user.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 22cc6cac0ba2..7eb94894bd68 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -201,7 +201,7 @@ struct tcmu_tmr {
uint8_t tmr_type;
uint32_t tmr_cmd_cnt;
- int16_t tmr_cmd_ids[];
+ int16_t tmr_cmd_ids[] __counted_by(tmr_cmd_cnt);
};
/*
--
2.34.1
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