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linux/drivers/video/fbdev
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Nam Cao 78d9161d2b fbdev: fix incorrect address computation in deferred IO 
With deferred IO enabled, a page fault happens when data is written to the
framebuffer device. Then driver determines which page is being updated by
calculating the offset of the written virtual address within the virtual
memory area, and uses this offset to get the updated page within the
internal buffer. This page is later copied to hardware (thus the name
"deferred IO").

This offset calculation is only correct if the virtual memory area is
mapped to the beginning of the internal buffer. Otherwise this is wrong.
For example, if users do:
    mmap(ptr, 4096, PROT_WRITE, MAP_FIXED | MAP_SHARED, fd, 0xff000);

Then the virtual memory area will mapped at offset 0xff000 within the
internal buffer. This offset 0xff000 is not accounted for, and wrong page
is updated.

Correct the calculation by using vmf->pgoff instead. With this change, the
variable "offset" will no longer hold the exact offset value, but it is
rounded down to multiples of PAGE_SIZE. But this is still correct, because
this variable is only used to calculate the page offset.

Reported-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Closes: https://lore.kernel.org/linux-fbdev/271372d6-e665-4e7f-b088-dee5f4ab341a@oracle.com
Fixes: 56c134f7f1 ("fbdev: Track deferred-I/O pages in pageref struct")
Cc: <stable@vger.kernel.org>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240423115053.4490-1-namcao@linutronix.de
2024-04-24 15:03:37 +02:00
..
aty Merge tag 'drm-misc-next-2023-10-27' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-10-31 10:47:50 +10:00
core fbdev: fix incorrect address computation in deferred IO 2024-04-24 15:03:37 +02:00
geode video/nomodeset: Select nomodeset= parameter with CONFIG_VIDEO 2024-01-23 10:11:38 +01:00
i810 fbdev/i810fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:32 +02:00
kyro Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
matrox fbdev: remove I2C_CLASS_DDC support 2024-01-18 21:10:41 +01:00
mb862xx fbdev: mb862xxfb: Fix defined but not used error 2024-03-15 10:01:27 +01:00
mmp video: fbdev: mmp: Follow renaming of SPI "master" to "controller" 2024-02-08 11:54:58 +00:00
nvidia fbdev/nvidiafb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:53 +02:00
omap fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
omap2 fbdev: panel-tpo-td043mtea1: Convert sprintf() to sysfs_emit() 2024-03-21 19:37:20 +01:00
riva fbdev/rivafb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:16 +02:00
savage fbdev: savage: Error out if pixclock equals zero 2024-01-21 09:00:14 +01:00
sis fbdev: sis: Error out if pixclock equals zero 2024-01-21 09:00:14 +01:00
via fbdev: viafb: fix typo in hw_bitblt_1 and hw_bitblt_2 2024-03-15 10:05:35 +01:00
68328fb.c fbdev/68328fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:54:16 +02:00
acornfb.c fbdev/acornfb: Fix name of fb_ops initializer macro 2023-11-29 12:20:08 +01:00
acornfb.h
amifb.c fbdev: amifb: Convert to platform remove callback returning void 2023-11-10 09:16:02 +01:00
arcfb.c fbdev/arcfb: Use generator macros for deferred I/O 2023-11-29 12:20:14 +01:00
arkfb.c fbcon: Increase maximum font width x height to 64 x 128 2024-03-16 08:29:48 +01:00
asiliantfb.c fbdev/asiliantfb: Use fbdev I/O helpers 2023-08-04 15:54:34 +02:00
atafb_iplan2p2.c
atafb_iplan2p4.c
atafb_iplan2p8.c
atafb_mfb.c
atafb_utils.h
atafb.c fbdev/atafb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:54:38 +02:00
atafb.h
atmel_lcdfb.c fbdev: atmel_lcdfb: Convert to platform remove callback returning void 2023-11-10 07:34:19 +01:00
au1100fb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
au1100fb.h
au1200fb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
au1200fb.h
broadsheetfb.c fbdev: Align deferred I/O with naming of helpers 2023-07-31 20:07:24 +02:00
bt431.h
bt455.h
bw2.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
c2p_core.h
c2p_iplan2.c
c2p_planar.c
c2p.h
carminefb_regs.h
carminefb.c fbdev/carminefb: Use fbdev I/O helpers 2023-08-04 15:54:35 +02:00
carminefb.h
cg3.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
cg6.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
cg14.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
chipsfb.c fbdev/chipsfb: Include <linux/backlight.h> 2024-03-07 13:33:34 +01:00
cirrusfb.c fbdev/cirrusfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:54:52 +02:00
clps711x-fb.c fbdev/clps711x-fb: Initialize fb_ops with fbdev macros 2023-11-29 12:20:35 +01:00
cobalt_lcdfb.c fbdev/cobalt-lcd: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:54:56 +02:00
controlfb.c fbdev/controlfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:54:59 +02:00
controlfb.h
cyber2000fb.c This cycle, I2C removes the currently unused CLASS_DDC support 2024-01-18 17:29:01 -08:00
cyber2000fb.h
da8xx-fb.c fbdev/da8xx-fb: Use fbdev I/O helpers 2023-08-04 15:54:35 +02:00
dnfb.c fbdev/dnfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:07 +02:00
edid.h
efifb.c fbdev/efifb: Remove framebuffer relocation tracking 2024-02-14 10:09:21 +01:00
ep93xx-fb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
ffb.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
fm2fb.c fbdev/fm2fb: Use fbdev I/O helpers 2023-08-04 15:54:35 +02:00
fsl-diu-fb.c fbdev: fsl-diu-fb: Fix sparse warning due to virt_to_phys() prototype change 2024-01-11 17:09:01 +01:00
g364fb.c fbdev/g364fb: fix build failure with mips 2023-09-02 08:18:40 -07:00
gbefb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
goldfishfb.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
grvga.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
gxt4500.c fbdev/gxt4500: Use fbdev I/O helpers 2023-08-04 15:54:36 +02:00
hecubafb.c fbdev: Align deferred I/O with naming of helpers 2023-07-31 20:07:24 +02:00
hgafb.c Normalise "name (ad@dr)" MODULE_AUTHORs to "name <ad@dr>" 2024-03-06 13:07:39 -08:00
hitfb.c fbdev/hitfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:23 +02:00
hpfb.c fbdev/hpfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:27 +02:00
hyperv_fb.c fbdev/hyperv_fb: Fix logic error for Gen2 VMs in hvfb_getmem() 2024-03-01 08:19:11 +00:00
i740_reg.h
i740fb.c fbdev: remove I2C_CLASS_DDC support 2024-01-18 21:10:41 +01:00
imsttfb.c fbdev: imsttfb: fix a resource leak in probe 2023-11-07 14:42:34 +01:00
imxfb.c fbdev: imxfb: add '*/' on a separate line in block comment 2024-01-11 17:09:01 +01:00
Kconfig fbdev: Select I/O-memory framebuffer ops for SBus 2024-03-25 21:34:08 +01:00
leo.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
macfb.c fbdev/macfb: Use fbdev I/O helpers 2023-08-04 15:54:36 +02:00
macmodes.c
macmodes.h
Makefile fbdev: amba-clcd: Delete the old CLCD driver 2024-01-12 12:38:37 +01:00
maxinefb.c fbdev/maxinefb: Use fbdev I/O helpers 2023-08-04 15:54:36 +02:00
metronomefb.c fbdev: Align deferred I/O with naming of helpers 2023-07-31 20:07:24 +02:00
n411.c
neofb.c fbdev/neofb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:55:48 +02:00
ocfb.c fbdev/ocfb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
offb.c fbdev: offb: Simplify offb_init_fb() 2023-11-07 14:42:34 +01:00
p9100.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
platinumfb.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
platinumfb.h
pm2fb.c fbdev/pm2fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:00 +02:00
pm3fb.c fbdev/pm3fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:04 +02:00
pmag-aa-fb.c fbdev/pmag-aa-fb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
pmag-ba-fb.c fbdev/pmag-ba-fb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
pmagb-b-fb.c fbdev/pmagb-b-fb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
ps3fb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
pvr2fb.c fbdev/pvr2fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:08 +02:00
pxa3xx-gcu.c fbdev: pxa3xx-gcu: Convert to platform remove callback returning void 2023-04-24 11:48:31 +02:00
pxa3xx-gcu.h
pxa3xx-regs.h ARM: pxa: move regs-lcd.h into driver 2022-04-19 16:29:03 +02:00
pxa168fb.c fbdev/pxa168fb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
pxa168fb.h
pxafb.c fbdev/pxafb: Use fbdev I/O helpers 2023-08-04 15:54:37 +02:00
pxafb.h
q40fb.c fbdev/q40fb: Use fbdev I/O helpers 2023-08-04 15:54:38 +02:00
s1d13xxxfb.c fbdev/s1d13xxxfb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:23 +02:00
s3c-fb.c fbdev/s3cfb: Use fbdev I/O helpers 2023-08-04 15:54:38 +02:00
s3fb.c fbcon: Increase maximum font width x height to 64 x 128 2024-03-16 08:29:48 +01:00
sa1100fb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
sa1100fb.h
sbuslib.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
sbuslib.h fbdev/sbus: Add initializer macros and Kconfig tokens for SBUS support 2023-08-28 09:43:53 +02:00
sh7760fb.c fbdev/sh7760fb: Use fbdev I/O helpers 2023-08-04 15:54:38 +02:00
sh_mobile_lcdcfb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
sh_mobile_lcdcfb.h
simplefb.c fbdev/simplefb: change loglevel when the power domains cannot be parsed 2023-12-14 10:31:45 +01:00
skeletonfb.c fbdev: Remove FBINFO_DEFAULT from framebuffer_alloc()'ed structs 2023-07-24 16:50:38 +02:00
sm501fb.c fbdev/sm501fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:43 +02:00
sm712.h
sm712fb.c fbdev/sm712fb: Use correct initializer macros for struct fb_ops 2023-11-29 12:20:10 +01:00
smscufx.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
ssd1307fb.c pwm: Rename pwm_apply_state() to pwm_apply_might_sleep() 2023-12-20 16:07:04 +01:00
sstfb.c fbdev/sstfb: Use fbdev I/O helpers 2023-08-04 15:54:38 +02:00
stifb.c fbdev: stifb: Fix crash in stifb_blank() 2024-01-23 09:13:24 +01:00
sunxvr500.c fbdev/sunxvr500: Initialize fb_ops to fbdev I/O-memory helpers 2023-10-19 12:56:55 +02:00
sunxvr1000.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
sunxvr2500.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00
tcx.c Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next 2023-09-22 16:28:36 +10:00
tdfxfb.c fbdev: remove I2C_CLASS_DDC support 2024-01-18 21:10:41 +01:00
tgafb.c vt: remove superfluous CONFIG_HW_CONSOLE 2024-01-27 19:03:51 -08:00
tridentfb.c fbdev: remove I2C_CLASS_DDC support 2024-01-18 21:10:41 +01:00
udlfb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
uvesafb.c fbdev: uvesafb: Convert sprintf/snprintf to sysfs_emit 2024-03-15 09:25:07 +01:00
valkyriefb.c fbdev/valkyriefb: Use fbdev I/O helpers 2023-08-04 15:54:38 +02:00
valkyriefb.h
vesafb.c fbdev/vesafb: Use screen_info pointer from device 2023-12-18 11:26:34 +01:00
vfb.c fbdev: Push pgprot_decrypted() into mmap implementations 2023-11-29 12:20:44 +01:00
vga16fb.c fbcon: Increase maximum font width x height to 64 x 128 2024-03-16 08:29:48 +01:00
vt8500lcdfb.c fbdev: vt8500lcdfb: Remove unnecessary print function dev_err() 2024-01-21 08:49:56 +01:00
vt8500lcdfb.h
vt8623fb.c fbcon: Increase maximum font width x height to 64 x 128 2024-03-16 08:29:48 +01:00
wm8505fb_regs.h
wm8505fb.c fbdev/wm8505fb: Initialize fb_ops to fbdev I/O-memory helpers 2023-11-29 12:20:38 +01:00
wmt_ge_rops.c fbdev: Include <linux/io.h> in various drivers 2023-05-18 11:06:19 +02:00
wmt_ge_rops.h
xen-fbfront.c fbdev: Align deferred I/O with naming of helpers 2023-07-31 20:07:24 +02:00
xilinxfb.c Linux 6.5-rc7 2023-08-24 07:26:06 +10:00