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Message-ID: <Y3CgReK3e519a7bs@mail.google.com>
Date: Sun, 13 Nov 2022 20:44:05 +1300
From: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
To: Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>,
Slark Xiao <slark_xiao@....com>,
Rongguang Wei <weirongguang@...inos.cn>,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
paulo.miguel.almeida.rodenas@...il.com
Subject: [PATCH] [next] drm/amdgpu: Replace one-elements array with
flex-array members
One-element arrays are deprecated, and we are replacing them with
flexible array members instead. So, replace one-element array with
flexible-array member in structs ATOM_I2C_VOLTAGE_OBJECT_V3,
ATOM_ASIC_INTERNAL_SS_INFO_V2, ATOM_ASIC_INTERNAL_SS_INFO_V3,
and refactor the rest of the code accordingly.
Important to mention is that doing a build before/after this patch
results in no functional binary output differences.
This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/238
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]
Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
---
Binary difference findings:
Some changes took more than a single line which changed the line
number parameter passed to the drm_dbg function (which leverages
kernel's dynamic debugging). Functionally-wise, nothing changed
after doing a before/after patch build.
---
.../gpu/drm/amd/display/dc/bios/bios_parser.c | 22 ++++++++++++-------
drivers/gpu/drm/amd/include/atombios.h | 6 ++---
2 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
index 6b9e64cd4379..a1a00f432168 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
@@ -665,8 +665,9 @@ static enum bp_result get_ss_info_v3_1(
if (!DATA_TABLES(ASIC_InternalSS_Info))
return BP_RESULT_UNSUPPORTED;
- ss_table_header_include = GET_IMAGE(ATOM_ASIC_INTERNAL_SS_INFO_V3,
- DATA_TABLES(ASIC_InternalSS_Info));
+ ss_table_header_include = ((ATOM_ASIC_INTERNAL_SS_INFO_V3 *) bios_get_image(&bp->base,
+ DATA_TABLES(ASIC_InternalSS_Info),
+ struct_size(ss_table_header_include, asSpreadSpectrum, 1)));
table_size =
(le16_to_cpu(ss_table_header_include->sHeader.usStructureSize)
- sizeof(ATOM_COMMON_TABLE_HEADER))
@@ -1032,8 +1033,10 @@ static enum bp_result get_ss_info_from_internal_ss_info_tbl_V2_1(
if (!DATA_TABLES(ASIC_InternalSS_Info))
return result;
- header = GET_IMAGE(ATOM_ASIC_INTERNAL_SS_INFO_V2,
- DATA_TABLES(ASIC_InternalSS_Info));
+ header = ((ATOM_ASIC_INTERNAL_SS_INFO_V2 *) bios_get_image(
+ &bp->base,
+ DATA_TABLES(ASIC_InternalSS_Info),
+ struct_size(header, asSpreadSpectrum, 1)));
memset(info, 0, sizeof(struct spread_spectrum_info));
@@ -1712,8 +1715,10 @@ static uint32_t get_ss_entry_number_from_internal_ss_info_tbl_v2_1(
if (!DATA_TABLES(ASIC_InternalSS_Info))
return 0;
- header_include = GET_IMAGE(ATOM_ASIC_INTERNAL_SS_INFO_V2,
- DATA_TABLES(ASIC_InternalSS_Info));
+ header_include = ((ATOM_ASIC_INTERNAL_SS_INFO_V2 *) bios_get_image(
+ &bp->base,
+ DATA_TABLES(ASIC_InternalSS_Info),
+ struct_size(header_include, asSpreadSpectrum, 1)));
size = (le16_to_cpu(header_include->sHeader.usStructureSize)
- sizeof(ATOM_COMMON_TABLE_HEADER))
@@ -1749,8 +1754,9 @@ static uint32_t get_ss_entry_number_from_internal_ss_info_tbl_V3_1(
if (!DATA_TABLES(ASIC_InternalSS_Info))
return number;
- header_include = GET_IMAGE(ATOM_ASIC_INTERNAL_SS_INFO_V3,
- DATA_TABLES(ASIC_InternalSS_Info));
+ header_include = ((ATOM_ASIC_INTERNAL_SS_INFO_V3 *) bios_get_image(&bp->base,
+ DATA_TABLES(ASIC_InternalSS_Info),
+ struct_size(header_include, asSpreadSpectrum, 1)));
size = (le16_to_cpu(header_include->sHeader.usStructureSize) -
sizeof(ATOM_COMMON_TABLE_HEADER)) /
sizeof(ATOM_ASIC_SS_ASSIGNMENT_V3);
diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h
index 60c44a8a067f..4dc738c51771 100644
--- a/drivers/gpu/drm/amd/include/atombios.h
+++ b/drivers/gpu/drm/amd/include/atombios.h
@@ -5146,7 +5146,7 @@ typedef struct _ATOM_I2C_VOLTAGE_OBJECT_V3
UCHAR ucVoltageControlOffset;
UCHAR ucVoltageControlFlag; // Bit0: 0 - One byte data; 1 - Two byte data
UCHAR ulReserved[3];
- VOLTAGE_LUT_ENTRY asVolI2cLut[1]; // end with 0xff
+ VOLTAGE_LUT_ENTRY asVolI2cLut[]; // end with 0xff
}ATOM_I2C_VOLTAGE_OBJECT_V3;
// ATOM_I2C_VOLTAGE_OBJECT_V3.ucVoltageControlFlag
@@ -6679,7 +6679,7 @@ typedef struct _ATOM_ASIC_INTERNAL_SS_INFO
typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V2
{
ATOM_COMMON_TABLE_HEADER sHeader;
- ATOM_ASIC_SS_ASSIGNMENT_V2 asSpreadSpectrum[1]; //this is point only.
+ ATOM_ASIC_SS_ASSIGNMENT_V2 asSpreadSpectrum[]; //this is point only.
}ATOM_ASIC_INTERNAL_SS_INFO_V2;
typedef struct _ATOM_ASIC_SS_ASSIGNMENT_V3
@@ -6701,7 +6701,7 @@ typedef struct _ATOM_ASIC_SS_ASSIGNMENT_V3
typedef struct _ATOM_ASIC_INTERNAL_SS_INFO_V3
{
ATOM_COMMON_TABLE_HEADER sHeader;
- ATOM_ASIC_SS_ASSIGNMENT_V3 asSpreadSpectrum[1]; //this is pointer only.
+ ATOM_ASIC_SS_ASSIGNMENT_V3 asSpreadSpectrum[]; //this is pointer only.
}ATOM_ASIC_INTERNAL_SS_INFO_V3;
--
2.37.3
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