mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 14:43:03 +00:00
6fe888c4d2
Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned. The UBSAN warning calltrace like below:
UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20
left shift of 1 by 31 places cannot be represented in type 'int'
<TASK>
dump_stack_lvl+0x7d/0xa5
dump_stack+0x15/0x1b
ubsan_epilogue+0xe/0x4e
__ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
get_default_font+0x1c7/0x1f0
fbcon_startup+0x347/0x3a0
do_take_over_console+0xce/0x270
do_fbcon_takeover+0xa1/0x170
do_fb_registered+0x2a8/0x340
fbcon_fb_registered+0x47/0xe0
register_framebuffer+0x294/0x4a0
__drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]
drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]
drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]
drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]
bochs_pci_probe+0x6ca/0x772 [bochs]
local_pci_probe+0x4d/0xb0
pci_device_probe+0x119/0x320
really_probe+0x181/0x550
__driver_probe_device+0xc6/0x220
driver_probe_device+0x32/0x100
__driver_attach+0x195/0x200
bus_for_each_dev+0xbb/0x120
driver_attach+0x27/0x30
bus_add_driver+0x22e/0x2f0
driver_register+0xa9/0x190
__pci_register_driver+0x90/0xa0
bochs_pci_driver_init+0x52/0x1000 [bochs]
do_one_initcall+0x76/0x430
do_init_module+0x61/0x28a
load_module+0x1f82/0x2e50
__do_sys_finit_module+0xf8/0x190
__x64_sys_finit_module+0x23/0x30
do_syscall_64+0x58/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
Link: https://lkml.kernel.org/r/20221031113829.4183153-1-cuigaosheng1@huawei.com
Fixes: c81f717cb9 ("fbcon: Fix typo and bogus logic in get_default_font")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
154 lines
3.0 KiB
C
154 lines
3.0 KiB
C
/*
|
|
* `Soft' font definitions
|
|
*
|
|
* Created 1995 by Geert Uytterhoeven
|
|
* Rewritten 1998 by Martin Mares <mj@ucw.cz>
|
|
*
|
|
* 2001 - Documented with DocBook
|
|
* - Brad Douglas <brad@neruo.com>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#if defined(__mc68000__)
|
|
#include <asm/setup.h>
|
|
#endif
|
|
#include <linux/font.h>
|
|
|
|
static const struct font_desc *fonts[] = {
|
|
#ifdef CONFIG_FONT_8x8
|
|
&font_vga_8x8,
|
|
#endif
|
|
#ifdef CONFIG_FONT_8x16
|
|
&font_vga_8x16,
|
|
#endif
|
|
#ifdef CONFIG_FONT_6x11
|
|
&font_vga_6x11,
|
|
#endif
|
|
#ifdef CONFIG_FONT_7x14
|
|
&font_7x14,
|
|
#endif
|
|
#ifdef CONFIG_FONT_SUN8x16
|
|
&font_sun_8x16,
|
|
#endif
|
|
#ifdef CONFIG_FONT_SUN12x22
|
|
&font_sun_12x22,
|
|
#endif
|
|
#ifdef CONFIG_FONT_10x18
|
|
&font_10x18,
|
|
#endif
|
|
#ifdef CONFIG_FONT_ACORN_8x8
|
|
&font_acorn_8x8,
|
|
#endif
|
|
#ifdef CONFIG_FONT_PEARL_8x8
|
|
&font_pearl_8x8,
|
|
#endif
|
|
#ifdef CONFIG_FONT_MINI_4x6
|
|
&font_mini_4x6,
|
|
#endif
|
|
#ifdef CONFIG_FONT_6x10
|
|
&font_6x10,
|
|
#endif
|
|
#ifdef CONFIG_FONT_TER16x32
|
|
&font_ter_16x32,
|
|
#endif
|
|
#ifdef CONFIG_FONT_6x8
|
|
&font_6x8,
|
|
#endif
|
|
};
|
|
|
|
#define num_fonts ARRAY_SIZE(fonts)
|
|
|
|
#ifdef NO_FONTS
|
|
#error No fonts configured.
|
|
#endif
|
|
|
|
|
|
/**
|
|
* find_font - find a font
|
|
* @name: string name of a font
|
|
*
|
|
* Find a specified font with string name @name.
|
|
*
|
|
* Returns %NULL if no font found, or a pointer to the
|
|
* specified font.
|
|
*
|
|
*/
|
|
const struct font_desc *find_font(const char *name)
|
|
{
|
|
unsigned int i;
|
|
|
|
BUILD_BUG_ON(!num_fonts);
|
|
for (i = 0; i < num_fonts; i++)
|
|
if (!strcmp(fonts[i]->name, name))
|
|
return fonts[i];
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(find_font);
|
|
|
|
|
|
/**
|
|
* get_default_font - get default font
|
|
* @xres: screen size of X
|
|
* @yres: screen size of Y
|
|
* @font_w: bit array of supported widths (1 - 32)
|
|
* @font_h: bit array of supported heights (1 - 32)
|
|
*
|
|
* Get the default font for a specified screen size.
|
|
* Dimensions are in pixels.
|
|
*
|
|
* Returns %NULL if no font is found, or a pointer to the
|
|
* chosen font.
|
|
*
|
|
*/
|
|
const struct font_desc *get_default_font(int xres, int yres, u32 font_w,
|
|
u32 font_h)
|
|
{
|
|
int i, c, cc, res;
|
|
const struct font_desc *f, *g;
|
|
|
|
g = NULL;
|
|
cc = -10000;
|
|
for (i = 0; i < num_fonts; i++) {
|
|
f = fonts[i];
|
|
c = f->pref;
|
|
#if defined(__mc68000__)
|
|
#ifdef CONFIG_FONT_PEARL_8x8
|
|
if (MACH_IS_AMIGA && f->idx == PEARL8x8_IDX)
|
|
c = 100;
|
|
#endif
|
|
#ifdef CONFIG_FONT_6x11
|
|
if (MACH_IS_MAC && xres < 640 && f->idx == VGA6x11_IDX)
|
|
c = 100;
|
|
#endif
|
|
#endif
|
|
if ((yres < 400) == (f->height <= 8))
|
|
c += 1000;
|
|
|
|
/* prefer a bigger font for high resolution */
|
|
res = (xres / f->width) * (yres / f->height) / 1000;
|
|
if (res > 20)
|
|
c += 20 - res;
|
|
|
|
if ((font_w & (1U << (f->width - 1))) &&
|
|
(font_h & (1U << (f->height - 1))))
|
|
c += 1000;
|
|
|
|
if (c > cc) {
|
|
cc = c;
|
|
g = f;
|
|
}
|
|
}
|
|
return g;
|
|
}
|
|
EXPORT_SYMBOL(get_default_font);
|
|
|
|
MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
|
|
MODULE_DESCRIPTION("Console Fonts");
|
|
MODULE_LICENSE("GPL");
|