linux-hardening - [PATCH][next] media: venus: hfi_cmds: Replace one-element array with flex-array member and use __counted

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Date: Mon, 9 Oct 2023 12:42:05 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
	Vikash Garodia <quic_vgarodia@...cinc.com>,
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
	Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] media: venus: hfi_cmds: Replace one-element array with
 flex-array member and use __counted_by

Array `data` in `struct hfi_sfr` is being used as a fake flexible array
at run-time:

drivers/media/platform/qcom/venus/hfi_venus.c:
1033         p = memchr(sfr->data, '\0', sfr->buf_size);
1034         /*
1035          * SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates
1036          * that Venus is in the process of crashing.
1037          */
1038         if (!p)
1039                 sfr->data[sfr->buf_size - 1] = '\0';
1040
1041         dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data);

Fake flexible arrays are deprecated, and should be replaced by
flexible-array members. So, replace one-element array with a
flexible-array member in `struct hfi_sfr`.

While there, also annotate array `data` with __counted_by() to 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 via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

This results in no differences in binary output.

This issue was found with the help of Coccinelle, and audited and fixed
manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/media/platform/qcom/venus/hfi_cmds.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.h b/drivers/media/platform/qcom/venus/hfi_cmds.h
index dd9c5066442d..20acd412ee7b 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.h
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.h
@@ -242,7 +242,7 @@ struct hfi_session_parse_sequence_header_pkt {
 
 struct hfi_sfr {
 	u32 buf_size;
-	u8 data[1];
+	u8 data[] __counted_by(buf_size);
 };
 
 struct hfi_sys_test_ssr_pkt {
-- 
2.34.1