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Date: Thu, 3 Jun 2021 19:43:38 -0500
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...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, Kees Cook <keescook@...omium.org>
Subject: [PATCH v2][next] media: venus: hfi_msgs.h: Replace one-element
arrays with flexible-array members
There is a regular need in the kernel to provide a way to declare having
a dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].
Use flexible-array members in struct hfi_msg_sys_property_info_pkt and
hfi_msg_session_property_info_pkt instead of one-element arrays, and
refactor the code accordingly.
Also, this helps with the ongoing efforts to enable -Warray-bounds by
fixing the following warnings:
CC [M] drivers/media/platform/qcom/venus/hfi_msgs.o
drivers/media/platform/qcom/venus/hfi_msgs.c: In function ‘hfi_sys_property_info’:
drivers/media/platform/qcom/venus/hfi_msgs.c:246:35: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
246 | if (req_bytes < 128 || !pkt->data[1] || pkt->num_properties > 1)
| ~~~~~~~~~^~~
drivers/media/platform/qcom/venus/hfi_msgs.c: In function ‘hfi_session_prop_info’:
drivers/media/platform/qcom/venus/hfi_msgs.c:342:62: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
342 | if (!req_bytes || req_bytes % sizeof(*buf_req) || !pkt->data[1])
| ~~~~~~~~~^~~
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Co-developed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v2:
- Fix packet size calculation by adding member _property_ to
both structutures hfi_msg_sys_property_info_pkt and
hfi_msg_session_property_info_pkt, and refactor the code
accordingly.
JFYI: We are about to be able to globally enable -Warray-bounds and,
these are pretty much the last out-of-bounds warnings in linux-next. :)
drivers/media/platform/qcom/venus/hfi_msgs.c | 16 ++++++++--------
drivers/media/platform/qcom/venus/hfi_msgs.h | 6 ++++--
2 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.c b/drivers/media/platform/qcom/venus/hfi_msgs.c
index a2d436d407b2..d9fde66f6fa8 100644
--- a/drivers/media/platform/qcom/venus/hfi_msgs.c
+++ b/drivers/media/platform/qcom/venus/hfi_msgs.c
@@ -251,11 +251,11 @@ sys_get_prop_image_version(struct device *dev,
req_bytes = pkt->hdr.size - sizeof(*pkt);
- if (req_bytes < VER_STR_SZ || !pkt->data[1] || pkt->num_properties > 1)
+ if (req_bytes < VER_STR_SZ || !pkt->data[0] || pkt->num_properties > 1)
/* bad packet */
return;
- img_ver = (u8 *)&pkt->data[1];
+ img_ver = pkt->data;
dev_dbg(dev, VDBGL "F/W version: %s\n", img_ver);
@@ -277,7 +277,7 @@ static void hfi_sys_property_info(struct venus_core *core,
return;
}
- switch (pkt->data[0]) {
+ switch (pkt->property) {
case HFI_PROPERTY_SYS_IMAGE_VERSION:
sys_get_prop_image_version(dev, pkt);
break;
@@ -338,7 +338,7 @@ session_get_prop_profile_level(struct hfi_msg_session_property_info_pkt *pkt,
/* bad packet */
return HFI_ERR_SESSION_INVALID_PARAMETER;
- hfi = (struct hfi_profile_level *)&pkt->data[1];
+ hfi = (struct hfi_profile_level *)&pkt->data[0];
profile_level->profile = hfi->profile;
profile_level->level = hfi->level;
@@ -355,11 +355,11 @@ session_get_prop_buf_req(struct hfi_msg_session_property_info_pkt *pkt,
req_bytes = pkt->shdr.hdr.size - sizeof(*pkt);
- if (!req_bytes || req_bytes % sizeof(*buf_req) || !pkt->data[1])
+ if (!req_bytes || req_bytes % sizeof(*buf_req) || !pkt->data[0])
/* bad packet */
return HFI_ERR_SESSION_INVALID_PARAMETER;
- buf_req = (struct hfi_buffer_requirements *)&pkt->data[1];
+ buf_req = (struct hfi_buffer_requirements *)&pkt->data[0];
if (!buf_req)
return HFI_ERR_SESSION_INVALID_PARAMETER;
@@ -391,7 +391,7 @@ static void hfi_session_prop_info(struct venus_core *core,
goto done;
}
- switch (pkt->data[0]) {
+ switch (pkt->property) {
case HFI_PROPERTY_CONFIG_BUFFER_REQUIREMENTS:
memset(hprop->bufreq, 0, sizeof(hprop->bufreq));
error = session_get_prop_buf_req(pkt, hprop->bufreq);
@@ -404,7 +404,7 @@ static void hfi_session_prop_info(struct venus_core *core,
case HFI_PROPERTY_CONFIG_VDEC_ENTROPY:
break;
default:
- dev_dbg(dev, VDBGM "unknown property id:%x\n", pkt->data[0]);
+ dev_dbg(dev, VDBGM "unknown property id:%x\n", pkt->property);
return;
}
diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.h b/drivers/media/platform/qcom/venus/hfi_msgs.h
index 526d9f5b487b..510513697335 100644
--- a/drivers/media/platform/qcom/venus/hfi_msgs.h
+++ b/drivers/media/platform/qcom/venus/hfi_msgs.h
@@ -113,7 +113,8 @@ struct hfi_msg_sys_ping_ack_pkt {
struct hfi_msg_sys_property_info_pkt {
struct hfi_pkt_hdr hdr;
u32 num_properties;
- u32 data[1];
+ u32 property;
+ u8 data[];
};
struct hfi_msg_session_load_resources_done_pkt {
@@ -233,7 +234,8 @@ struct hfi_msg_session_parse_sequence_header_done_pkt {
struct hfi_msg_session_property_info_pkt {
struct hfi_session_hdr_pkt shdr;
u32 num_properties;
- u32 data[1];
+ u32 property;
+ u8 data[];
};
struct hfi_msg_session_release_resources_done_pkt {
--
2.27.0
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