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Date: Tue, 8 Nov 2022 10:59:48 -0500
From: Alex Deucher <alexdeucher@...il.com>
To: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
Cc: 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>,
Slark Xiao <slark_xiao@....com>,
Rongguang Wei <weirongguang@...inos.cn>,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] [next] drm/amdgpu: Replace 1-element array with
flexible-array member
Applied. Thanks!
Alex
On Mon, Nov 7, 2022 at 4:33 AM Paulo Miguel Almeida
<paulo.miguel.almeida.rodenas@...il.com> wrote:
>
> 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_GPIO_PIN_ASSIGNMENT,
> _ATOM_DISPLAY_OBJECT_PATH, _ATOM_DISPLAY_OBJECT_PATH_TABLE,
> _ATOM_OBJECT_TABLE 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.
>
> Additional one-element arrays to be changed:
>
> There are more instances of one-element arrays to be changed but
> I will keep patches small so they are easy to review. [and I can
> only dedicate a few hours per day on this :-) ]
>
> ---
> .../gpu/drm/amd/display/dc/bios/bios_parser.c | 23 ++++++++++++-------
> drivers/gpu/drm/amd/include/atombios.h | 8 +++----
> 2 files changed, 19 insertions(+), 12 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 9b8ea6e9a2b9..39dd8b2dc254 100644
> --- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
> +++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
> @@ -138,7 +138,9 @@ static uint8_t get_number_of_objects(struct bios_parser *bp, uint32_t offset)
>
> uint32_t object_table_offset = bp->object_info_tbl_offset + offset;
>
> - table = GET_IMAGE(ATOM_OBJECT_TABLE, object_table_offset);
> + table = ((ATOM_OBJECT_TABLE *) bios_get_image(&bp->base,
> + object_table_offset,
> + struct_size(table, asObjects, 1)));
>
> if (!table)
> return 0;
> @@ -166,8 +168,9 @@ static struct graphics_object_id bios_parser_get_connector_id(
> uint32_t connector_table_offset = bp->object_info_tbl_offset
> + le16_to_cpu(bp->object_info_tbl.v1_1->usConnectorObjectTableOffset);
>
> - ATOM_OBJECT_TABLE *tbl =
> - GET_IMAGE(ATOM_OBJECT_TABLE, connector_table_offset);
> + ATOM_OBJECT_TABLE *tbl = ((ATOM_OBJECT_TABLE *) bios_get_image(&bp->base,
> + connector_table_offset,
> + struct_size(tbl, asObjects, 1)));
>
> if (!tbl) {
> dm_error("Can't get connector table from atom bios.\n");
> @@ -1789,11 +1792,13 @@ static enum bp_result bios_parser_get_gpio_pin_info(
> if (!DATA_TABLES(GPIO_Pin_LUT))
> return BP_RESULT_BADBIOSTABLE;
>
> - header = GET_IMAGE(ATOM_GPIO_PIN_LUT, DATA_TABLES(GPIO_Pin_LUT));
> + header = ((ATOM_GPIO_PIN_LUT *) bios_get_image(&bp->base,
> + DATA_TABLES(GPIO_Pin_LUT),
> + struct_size(header, asGPIO_Pin, 1)));
> if (!header)
> return BP_RESULT_BADBIOSTABLE;
>
> - if (sizeof(ATOM_COMMON_TABLE_HEADER) + sizeof(ATOM_GPIO_PIN_LUT)
> + if (sizeof(ATOM_COMMON_TABLE_HEADER) + struct_size(header, asGPIO_Pin, 1)
> > le16_to_cpu(header->sHeader.usStructureSize))
> return BP_RESULT_BADBIOSTABLE;
>
> @@ -1978,7 +1983,8 @@ static ATOM_OBJECT *get_bios_object(struct bios_parser *bp,
>
> offset += bp->object_info_tbl_offset;
>
> - tbl = GET_IMAGE(ATOM_OBJECT_TABLE, offset);
> + tbl = ((ATOM_OBJECT_TABLE *) bios_get_image(&bp->base, offset,
> + struct_size(tbl, asObjects, 1)));
> if (!tbl)
> return NULL;
>
> @@ -2709,8 +2715,9 @@ static enum bp_result get_bracket_layout_record(
>
> genericTableOffset = bp->object_info_tbl_offset +
> bp->object_info_tbl.v1_3->usMiscObjectTableOffset;
> - object_table = (ATOM_OBJECT_TABLE *)
> - GET_IMAGE(ATOM_OBJECT_TABLE, genericTableOffset);
> + object_table = ((ATOM_OBJECT_TABLE *) bios_get_image(&bp->base,
> + genericTableOffset,
> + struct_size(object_table, asObjects, 1)));
> if (!object_table)
> return BP_RESULT_FAILURE;
>
> diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h
> index b5b1d073f8e2..55ae93c1e365 100644
> --- a/drivers/gpu/drm/amd/include/atombios.h
> +++ b/drivers/gpu/drm/amd/include/atombios.h
> @@ -4386,7 +4386,7 @@ typedef struct _ATOM_GPIO_PIN_ASSIGNMENT
> typedef struct _ATOM_GPIO_PIN_LUT
> {
> ATOM_COMMON_TABLE_HEADER sHeader;
> - ATOM_GPIO_PIN_ASSIGNMENT asGPIO_Pin[1];
> + ATOM_GPIO_PIN_ASSIGNMENT asGPIO_Pin[];
> }ATOM_GPIO_PIN_LUT;
>
> /****************************************************************************/
> @@ -4513,7 +4513,7 @@ typedef struct _ATOM_DISPLAY_OBJECT_PATH
> USHORT usSize; //the size of ATOM_DISPLAY_OBJECT_PATH
> USHORT usConnObjectId; //Connector Object ID
> USHORT usGPUObjectId; //GPU ID
> - USHORT usGraphicObjIds[1]; //1st Encoder Obj source from GPU to last Graphic Obj destinate to connector.
> + USHORT usGraphicObjIds[]; //1st Encoder Obj source from GPU to last Graphic Obj destinate to connector.
> }ATOM_DISPLAY_OBJECT_PATH;
>
> typedef struct _ATOM_DISPLAY_EXTERNAL_OBJECT_PATH
> @@ -4530,7 +4530,7 @@ typedef struct _ATOM_DISPLAY_OBJECT_PATH_TABLE
> UCHAR ucNumOfDispPath;
> UCHAR ucVersion;
> UCHAR ucPadding[2];
> - ATOM_DISPLAY_OBJECT_PATH asDispPath[1];
> + ATOM_DISPLAY_OBJECT_PATH asDispPath[];
> }ATOM_DISPLAY_OBJECT_PATH_TABLE;
>
> typedef struct _ATOM_OBJECT //each object has this structure
> @@ -4545,7 +4545,7 @@ typedef struct _ATOM_OBJECT_TABLE //Above 4 object table
> {
> UCHAR ucNumberOfObjects;
> UCHAR ucPadding[3];
> - ATOM_OBJECT asObjects[1];
> + ATOM_OBJECT asObjects[];
> }ATOM_OBJECT_TABLE;
>
> typedef struct _ATOM_SRC_DST_TABLE_FOR_ONE_OBJECT //usSrcDstTableOffset pointing to this structure
> --
> 2.37.3
>
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