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[112.120.42.27]) by smtp.gmail.com with ESMTPSA id b15sm2977078pft.84.2020.09.24.06.43.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2020 06:43:21 -0700 (PDT) From: Peilin Ye To: Greg Kroah-Hartman , Bartlomiej Zolnierkiewicz Cc: Peilin Ye , Jiri Slaby , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts Date: Thu, 24 Sep 2020 09:42:22 -0400 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: <7fb8bc9b0abc676ada6b7ac0e0bd443499357267.1600953813.git.yepeilin.cs@gmail.com> References: <7fb8bc9b0abc676ada6b7ac0e0bd443499357267.1600953813.git.yepeilin.cs@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has reported an issue in the framebuffer layer, where a malicious user may overflow our built-in font data buffers. In order to perform a reliable range check, subsystems need to know `FONTDATAMAX` for each built-in font. Unfortunately, our font descriptor, `struct console_font` does not contain `FONTDATAMAX`, and is part of the UAPI, making it infeasible to modify it. For user-provided fonts, the framebuffer layer resolves this issue by reserving four extra words at the beginning of data buffers. Later, whenever a function needs to access them, it simply uses the following macros: #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 Recently we have gathered all the above macros to . Let us do the same thing for built-in fonts, prepend four extra words (including `FONTDATAMAX`) to their data buffers, so that subsystems can use these macros for all fonts, no matter built-in or user-provided. This patch depends on patch "fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h". Cc: stable@vger.kernel.org Link: https://syzkaller.appspot.com/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd Signed-off-by: Peilin Ye --- include/linux/font.h | 5 +++++ lib/fonts/font_10x18.c | 9 ++++----- lib/fonts/font_6x10.c | 9 +++++---- lib/fonts/font_6x11.c | 9 ++++----- lib/fonts/font_7x14.c | 9 ++++----- lib/fonts/font_8x16.c | 9 ++++----- lib/fonts/font_8x8.c | 9 ++++----- lib/fonts/font_acorn_8x8.c | 9 ++++++--- lib/fonts/font_mini_4x6.c | 8 ++++---- lib/fonts/font_pearl_8x8.c | 9 ++++----- lib/fonts/font_sun12x22.c | 9 ++++----- lib/fonts/font_sun8x16.c | 7 ++++--- lib/fonts/font_ter16x32.c | 9 ++++----- 13 files changed, 56 insertions(+), 54 deletions(-) diff --git a/include/linux/font.h b/include/linux/font.h index 40ed008d7dad..59faa80f586d 100644 --- a/include/linux/font.h +++ b/include/linux/font.h @@ -67,4 +67,9 @@ extern const struct font_desc *get_default_font(int xres, int yres, #define FONT_EXTRA_WORDS 4 +struct font_data { + unsigned int extra[FONT_EXTRA_WORDS]; + const unsigned char data[]; +} __packed; + #endif /* _VIDEO_FONT_H */ diff --git a/lib/fonts/font_10x18.c b/lib/fonts/font_10x18.c index 532f0ff89a96..0e2deac97da0 100644 --- a/lib/fonts/font_10x18.c +++ b/lib/fonts/font_10x18.c @@ -8,8 +8,8 @@ #define FONTDATAMAX 9216 -static const unsigned char fontdata_10x18[FONTDATAMAX] = { - +static struct font_data fontdata_10x18 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, 0x00, /* 0000000000 */ 0x00, 0x00, /* 0000000000 */ @@ -5129,8 +5129,7 @@ static const unsigned char fontdata_10x18[FONTDATAMAX] = { 0x00, 0x00, /* 0000000000 */ 0x00, 0x00, /* 0000000000 */ 0x00, 0x00, /* 0000000000 */ - -}; +} }; const struct font_desc font_10x18 = { @@ -5138,7 +5137,7 @@ const struct font_desc font_10x18 = { .name = "10x18", .width = 10, .height = 18, - .data = fontdata_10x18, + .data = fontdata_10x18.data, #ifdef __sparc__ .pref = 5, #else diff --git a/lib/fonts/font_6x10.c b/lib/fonts/font_6x10.c index 09b2cc03435b..87da8acd07db 100644 --- a/lib/fonts/font_6x10.c +++ b/lib/fonts/font_6x10.c @@ -1,8 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 #include -static const unsigned char fontdata_6x10[] = { +#define FONTDATAMAX 2560 +static struct font_data fontdata_6x10 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ @@ -3074,14 +3076,13 @@ static const unsigned char fontdata_6x10[] = { 0x00, /* 00000000 */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ - -}; +} }; const struct font_desc font_6x10 = { .idx = FONT6x10_IDX, .name = "6x10", .width = 6, .height = 10, - .data = fontdata_6x10, + .data = fontdata_6x10.data, .pref = 0, }; diff --git a/lib/fonts/font_6x11.c b/lib/fonts/font_6x11.c index d7136c33f1f0..5e975dfa10a5 100644 --- a/lib/fonts/font_6x11.c +++ b/lib/fonts/font_6x11.c @@ -9,8 +9,8 @@ #define FONTDATAMAX (11*256) -static const unsigned char fontdata_6x11[FONTDATAMAX] = { - +static struct font_data fontdata_6x11 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ @@ -3338,8 +3338,7 @@ static const unsigned char fontdata_6x11[FONTDATAMAX] = { 0x00, /* 00000000 */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ - -}; +} }; const struct font_desc font_vga_6x11 = { @@ -3347,7 +3346,7 @@ const struct font_desc font_vga_6x11 = { .name = "ProFont6x11", .width = 6, .height = 11, - .data = fontdata_6x11, + .data = fontdata_6x11.data, /* Try avoiding this font if possible unless on MAC */ .pref = -2000, }; diff --git a/lib/fonts/font_7x14.c b/lib/fonts/font_7x14.c index 89752d0b23e8..86d298f38505 100644 --- a/lib/fonts/font_7x14.c +++ b/lib/fonts/font_7x14.c @@ -8,8 +8,8 @@ #define FONTDATAMAX 3584 -static const unsigned char fontdata_7x14[FONTDATAMAX] = { - +static struct font_data fontdata_7x14 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 0000000 */ 0x00, /* 0000000 */ @@ -4105,8 +4105,7 @@ static const unsigned char fontdata_7x14[FONTDATAMAX] = { 0x00, /* 0000000 */ 0x00, /* 0000000 */ 0x00, /* 0000000 */ - -}; +} }; const struct font_desc font_7x14 = { @@ -4114,6 +4113,6 @@ const struct font_desc font_7x14 = { .name = "7x14", .width = 7, .height = 14, - .data = fontdata_7x14, + .data = fontdata_7x14.data, .pref = 0, }; diff --git a/lib/fonts/font_8x16.c b/lib/fonts/font_8x16.c index b7ab1f5fbdb8..37cedd36ca5e 100644 --- a/lib/fonts/font_8x16.c +++ b/lib/fonts/font_8x16.c @@ -10,8 +10,8 @@ #define FONTDATAMAX 4096 -static const unsigned char fontdata_8x16[FONTDATAMAX] = { - +static struct font_data fontdata_8x16 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ @@ -4619,8 +4619,7 @@ static const unsigned char fontdata_8x16[FONTDATAMAX] = { 0x00, /* 00000000 */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ - -}; +} }; const struct font_desc font_vga_8x16 = { @@ -4628,7 +4627,7 @@ const struct font_desc font_vga_8x16 = { .name = "VGA8x16", .width = 8, .height = 16, - .data = fontdata_8x16, + .data = fontdata_8x16.data, .pref = 0, }; EXPORT_SYMBOL(font_vga_8x16); diff --git a/lib/fonts/font_8x8.c b/lib/fonts/font_8x8.c index 2328ebc8bab5..8ab695538395 100644 --- a/lib/fonts/font_8x8.c +++ b/lib/fonts/font_8x8.c @@ -9,8 +9,8 @@ #define FONTDATAMAX 2048 -static const unsigned char fontdata_8x8[FONTDATAMAX] = { - +static struct font_data fontdata_8x8 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ @@ -2570,8 +2570,7 @@ static const unsigned char fontdata_8x8[FONTDATAMAX] = { 0x00, /* 00000000 */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ - -}; +} }; const struct font_desc font_vga_8x8 = { @@ -2579,6 +2578,6 @@ const struct font_desc font_vga_8x8 = { .name = "VGA8x8", .width = 8, .height = 8, - .data = fontdata_8x8, + .data = fontdata_8x8.data, .pref = 0, }; diff --git a/lib/fonts/font_acorn_8x8.c b/lib/fonts/font_acorn_8x8.c index 0ff0e85d4481..069b3e80c434 100644 --- a/lib/fonts/font_acorn_8x8.c +++ b/lib/fonts/font_acorn_8x8.c @@ -3,7 +3,10 @@ #include -static const unsigned char acorndata_8x8[] = { +#define FONTDATAMAX 2048 + +static struct font_data acorndata_8x8 = { +{ 0, 0, FONTDATAMAX, 0 }, { /* 00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* ^@ */ /* 01 */ 0x7e, 0x81, 0xa5, 0x81, 0xbd, 0x99, 0x81, 0x7e, /* ^A */ /* 02 */ 0x7e, 0xff, 0xbd, 0xff, 0xc3, 0xe7, 0xff, 0x7e, /* ^B */ @@ -260,14 +263,14 @@ static const unsigned char acorndata_8x8[] = { /* FD */ 0x38, 0x04, 0x18, 0x20, 0x3c, 0x00, 0x00, 0x00, /* FE */ 0x00, 0x00, 0x3c, 0x3c, 0x3c, 0x3c, 0x00, 0x00, /* FF */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 -}; +} }; const struct font_desc font_acorn_8x8 = { .idx = ACORN8x8_IDX, .name = "Acorn8x8", .width = 8, .height = 8, - .data = acorndata_8x8, + .data = acorndata_8x8.data, #ifdef CONFIG_ARCH_ACORN .pref = 20, #else diff --git a/lib/fonts/font_mini_4x6.c b/lib/fonts/font_mini_4x6.c index 838caa1cfef7..1449876c6a27 100644 --- a/lib/fonts/font_mini_4x6.c +++ b/lib/fonts/font_mini_4x6.c @@ -43,8 +43,8 @@ __END__; #define FONTDATAMAX 1536 -static const unsigned char fontdata_mini_4x6[FONTDATAMAX] = { - +static struct font_data fontdata_mini_4x6 = { + { 0, 0, FONTDATAMAX, 0 }, { /*{*/ /* Char 0: ' ' */ 0xee, /*= [*** ] */ @@ -2145,14 +2145,14 @@ static const unsigned char fontdata_mini_4x6[FONTDATAMAX] = { 0xee, /*= [*** ] */ 0x00, /*= [ ] */ /*}*/ -}; +} }; const struct font_desc font_mini_4x6 = { .idx = MINI4x6_IDX, .name = "MINI4x6", .width = 4, .height = 6, - .data = fontdata_mini_4x6, + .data = fontdata_mini_4x6.data, .pref = 3, }; diff --git a/lib/fonts/font_pearl_8x8.c b/lib/fonts/font_pearl_8x8.c index b15d3c342c5b..32d65551e7ed 100644 --- a/lib/fonts/font_pearl_8x8.c +++ b/lib/fonts/font_pearl_8x8.c @@ -14,8 +14,8 @@ #define FONTDATAMAX 2048 -static const unsigned char fontdata_pearl8x8[FONTDATAMAX] = { - +static struct font_data fontdata_pearl8x8 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ @@ -2575,14 +2575,13 @@ static const unsigned char fontdata_pearl8x8[FONTDATAMAX] = { 0x00, /* 00000000 */ 0x00, /* 00000000 */ 0x00, /* 00000000 */ - -}; +} }; const struct font_desc font_pearl_8x8 = { .idx = PEARL8x8_IDX, .name = "PEARL8x8", .width = 8, .height = 8, - .data = fontdata_pearl8x8, + .data = fontdata_pearl8x8.data, .pref = 2, }; diff --git a/lib/fonts/font_sun12x22.c b/lib/fonts/font_sun12x22.c index 955d6eee3959..641a6b4dca42 100644 --- a/lib/fonts/font_sun12x22.c +++ b/lib/fonts/font_sun12x22.c @@ -3,8 +3,8 @@ #define FONTDATAMAX 11264 -static const unsigned char fontdata_sun12x22[FONTDATAMAX] = { - +static struct font_data fontdata_sun12x22 = { + { 0, 0, FONTDATAMAX, 0 }, { /* 0 0x00 '^@' */ 0x00, 0x00, /* 000000000000 */ 0x00, 0x00, /* 000000000000 */ @@ -6148,8 +6148,7 @@ static const unsigned char fontdata_sun12x22[FONTDATAMAX] = { 0x00, 0x00, /* 000000000000 */ 0x00, 0x00, /* 000000000000 */ 0x00, 0x00, /* 000000000000 */ - -}; +} }; const struct font_desc font_sun_12x22 = { @@ -6157,7 +6156,7 @@ const struct font_desc font_sun_12x22 = { .name = "SUN12x22", .width = 12, .height = 22, - .data = fontdata_sun12x22, + .data = fontdata_sun12x22.data, #ifdef __sparc__ .pref = 5, #else diff --git a/lib/fonts/font_sun8x16.c b/lib/fonts/font_sun8x16.c index 03d71e53954a..193fe6d988e0 100644 --- a/lib/fonts/font_sun8x16.c +++ b/lib/fonts/font_sun8x16.c @@ -3,7 +3,8 @@ #define FONTDATAMAX 4096 -static const unsigned char fontdata_sun8x16[FONTDATAMAX] = { +static struct font_data fontdata_sun8x16 = { +{ 0, 0, FONTDATAMAX, 0 }, { /* */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* */ 0x00,0x00,0x7e,0x81,0xa5,0x81,0x81,0xbd,0x99,0x81,0x81,0x7e,0x00,0x00,0x00,0x00, /* */ 0x00,0x00,0x7e,0xff,0xdb,0xff,0xff,0xc3,0xe7,0xff,0xff,0x7e,0x00,0x00,0x00,0x00, @@ -260,14 +261,14 @@ static const unsigned char fontdata_sun8x16[FONTDATAMAX] = { /* */ 0x00,0x70,0xd8,0x30,0x60,0xc8,0xf8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* */ 0x00,0x00,0x00,0x00,0x7c,0x7c,0x7c,0x7c,0x7c,0x7c,0x7c,0x00,0x00,0x00,0x00,0x00, /* */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, -}; +} }; const struct font_desc font_sun_8x16 = { .idx = SUN8x16_IDX, .name = "SUN8x16", .width = 8, .height = 16, - .data = fontdata_sun8x16, + .data = fontdata_sun8x16.data, #ifdef __sparc__ .pref = 10, #else diff --git a/lib/fonts/font_ter16x32.c b/lib/fonts/font_ter16x32.c index 3f0cf1ccdf3a..91b9c283bd9c 100644 --- a/lib/fonts/font_ter16x32.c +++ b/lib/fonts/font_ter16x32.c @@ -4,8 +4,8 @@ #define FONTDATAMAX 16384 -static const unsigned char fontdata_ter16x32[FONTDATAMAX] = { - +static struct font_data fontdata_ter16x32 = { + { 0, 0, FONTDATAMAX, 0 }, { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfc, 0x7f, 0xfc, 0x70, 0x1c, 0x70, 0x1c, 0x70, 0x1c, 0x70, 0x1c, @@ -2054,8 +2054,7 @@ static const unsigned char fontdata_ter16x32[FONTDATAMAX] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 255 */ - -}; +} }; const struct font_desc font_ter_16x32 = { @@ -2063,7 +2062,7 @@ const struct font_desc font_ter_16x32 = { .name = "TER16x32", .width = 16, .height = 32, - .data = fontdata_ter16x32, + .data = fontdata_ter16x32.data, #ifdef __sparc__ .pref = 5, #else -- 2.25.1