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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
/*
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* `Soft' font definitions
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*
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* Created 1995 by Geert Uytterhoeven
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* Rewritten 1998 by Martin Mares <mj@ucw.cz>
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*
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* 2001 - Documented with DocBook
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* - Brad Douglas <brad@neruo.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#if defined(__mc68000__)
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#include <asm/setup.h>
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#endif
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#include <linux/font.h>
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static const struct font_desc *fonts[] = {
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#ifdef CONFIG_FONT_8x8
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&font_vga_8x8,
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#endif
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#ifdef CONFIG_FONT_8x16
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&font_vga_8x16,
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#endif
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#ifdef CONFIG_FONT_6x11
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&font_vga_6x11,
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#endif
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#ifdef CONFIG_FONT_7x14
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&font_7x14,
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#endif
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#ifdef CONFIG_FONT_SUN8x16
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&font_sun_8x16,
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#endif
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#ifdef CONFIG_FONT_SUN12x22
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&font_sun_12x22,
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#endif
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#ifdef CONFIG_FONT_10x18
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&font_10x18,
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#endif
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#ifdef CONFIG_FONT_ACORN_8x8
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&font_acorn_8x8,
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#endif
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#ifdef CONFIG_FONT_PEARL_8x8
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&font_pearl_8x8,
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#endif
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#ifdef CONFIG_FONT_MINI_4x6
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&font_mini_4x6,
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#endif
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#ifdef CONFIG_FONT_6x10
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&font_6x10,
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#endif
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#ifdef CONFIG_FONT_TER16x32
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&font_ter_16x32,
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#endif
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#ifdef CONFIG_FONT_6x8
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&font_6x8,
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#endif
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};
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#define num_fonts ARRAY_SIZE(fonts)
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#ifdef NO_FONTS
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#error No fonts configured.
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#endif
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/**
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* find_font - find a font
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* @name: string name of a font
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*
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* Find a specified font with string name @name.
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*
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* Returns %NULL if no font found, or a pointer to the
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* specified font.
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*
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*/
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const struct font_desc *find_font(const char *name)
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{
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unsigned int i;
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BUILD_BUG_ON(!num_fonts);
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for (i = 0; i < num_fonts; i++)
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if (!strcmp(fonts[i]->name, name))
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return fonts[i];
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return NULL;
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}
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EXPORT_SYMBOL(find_font);
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/**
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* get_default_font - get default font
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* @xres: screen size of X
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* @yres: screen size of Y
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* @font_w: bit array of supported widths (1 - 32)
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* @font_h: bit array of supported heights (1 - 32)
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*
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* Get the default font for a specified screen size.
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* Dimensions are in pixels.
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*
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* Returns %NULL if no font is found, or a pointer to the
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* chosen font.
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*
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*/
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const struct font_desc *get_default_font(int xres, int yres, u32 font_w,
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u32 font_h)
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{
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int i, c, cc, res;
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const struct font_desc *f, *g;
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g = NULL;
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cc = -10000;
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for (i = 0; i < num_fonts; i++) {
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f = fonts[i];
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c = f->pref;
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#if defined(__mc68000__)
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#ifdef CONFIG_FONT_PEARL_8x8
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if (MACH_IS_AMIGA && f->idx == PEARL8x8_IDX)
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c = 100;
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#endif
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#ifdef CONFIG_FONT_6x11
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if (MACH_IS_MAC && xres < 640 && f->idx == VGA6x11_IDX)
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c = 100;
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#endif
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#endif
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if ((yres < 400) == (f->height <= 8))
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c += 1000;
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/* prefer a bigger font for high resolution */
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res = (xres / f->width) * (yres / f->height) / 1000;
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if (res > 20)
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c += 20 - res;
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if ((font_w & (1U << (f->width - 1))) &&
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(font_h & (1U << (f->height - 1))))
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c += 1000;
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if (c > cc) {
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cc = c;
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g = f;
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}
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}
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return g;
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}
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EXPORT_SYMBOL(get_default_font);
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MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
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MODULE_DESCRIPTION("Console Fonts");
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MODULE_LICENSE("GPL");
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