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Fonts: Support FONT_EXTRA_WORDS macros for font_6x8 

Recently, in commit 6735b4632d ("Fonts: Support FONT_EXTRA_WORDS macros
for built-in fonts"), we wrapped each of our built-in data buffers in a
`font_data` structure, in order to use the following macros on them, see
include/linux/font.h:

	#define REFCOUNT(fd)	(((int *)(fd))[-1])
	#define FNTSIZE(fd)	(((int *)(fd))[-2])
	#define FNTCHARCNT(fd)	(((int *)(fd))[-3])
	#define FNTSUM(fd)	(((int *)(fd))[-4])

	#define FONT_EXTRA_WORDS 4

Do the same thing to our new 6x8 font. For built-in fonts, currently we
only use FNTSIZE(). Since this is only a temporary solution for an
out-of-bounds issue in the framebuffer layer (see commit 5af0864079
("fbcon: Fix global-out-of-bounds read in fbcon_get_font()")), all the
three other fields are intentionally set to zero in order to discourage
using these negative-indexing macros.

Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/926453876c92caac34cba8545716a491754d04d5.1603037079.git.yepeilin.cs@gmail.com
This commit is contained in:
Peilin Ye 2020-10-18 14:12:04 -04:00 committed by Daniel Vetter
parent eda4a7bf5d
commit 272d708951
1 changed files with 4 additions and 4 deletions
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8
lib/fonts/font_6x8.c
View File

@ -3,8 +3,8 @@
#define FONTDATAMAX 2048
static const unsigned char fontdata_6x8[FONTDATAMAX] = {
static struct font_data fontdata_6x8 = {
{ 0, 0, FONTDATAMAX, 0 }, {
/* 0 0x00 '^@' */
0x00, /* 000000 */
0x00, /* 000000 */
@ -2564,13 +2564,13 @@ static const unsigned char fontdata_6x8[FONTDATAMAX] = {
0x00, /* 000000 */
0x00, /* 000000 */
0x00, /* 000000 */
};
} };
const struct font_desc font_6x8 = {
.idx = FONT6x8_IDX,
.name = "6x8",
.width = 6,
.height = 8,
.data = fontdata_6x8,
.data = fontdata_6x8.data,
.pref = 0,
};