| Message ID | 20230127165834.11387-1-tiwai@suse.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | fbdev: Fix invalid page access after closing deferred I/O devices | expand |
On Fri, Jan 27, 2023 at 05:58:34PM +0100, Takashi Iwai wrote: > When a fbdev with deferred I/O is once opened and closed, the dirty > pages still remain queued in the pageref list, and eventually later > those may be processed in the delayed work. This may lead to a > corruption of pages, hitting an Oops. > > This patch makes sure to cancel the delayed work and clean up the > pageref list at closing the device for addressing the bug. A part of > the cleanup code is factored out as a new helper function that is > called from the common fb_release(). > > Cc: <stable@vger.kernel.org> > Signed-off-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Patrik Jakobsson <pjakobsson@suse.de> > --- > drivers/video/fbdev/core/fb_defio.c | 10 +++++++++- > drivers/video/fbdev/core/fbmem.c | 2 ++ > include/linux/fb.h | 1 + > 3 files changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c > index c730253ab85c..583cbcf09446 100644 > --- a/drivers/video/fbdev/core/fb_defio.c > +++ b/drivers/video/fbdev/core/fb_defio.c > @@ -313,7 +313,7 @@ void fb_deferred_io_open(struct fb_info *info, > } > EXPORT_SYMBOL_GPL(fb_deferred_io_open); > > -void fb_deferred_io_cleanup(struct fb_info *info) > +void fb_deferred_io_release(struct fb_info *info) > { > struct fb_deferred_io *fbdefio = info->fbdefio; > struct page *page; > @@ -327,6 +327,14 @@ void fb_deferred_io_cleanup(struct fb_info *info) > page = fb_deferred_io_page(info, i); > page->mapping = NULL; > } > +} > +EXPORT_SYMBOL_GPL(fb_deferred_io_release); > + > +void fb_deferred_io_cleanup(struct fb_info *info) > +{ > + struct fb_deferred_io *fbdefio = info->fbdefio; > + > + fb_deferred_io_release(info); > > kvfree(info->pagerefs); > mutex_destroy(&fbdefio->lock); > diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c > index 3a6c8458eb8d..78c4cb5ee7c9 100644 > --- a/drivers/video/fbdev/core/fbmem.c > +++ b/drivers/video/fbdev/core/fbmem.c > @@ -1454,6 +1454,8 @@ __releases(&info->lock) > struct fb_info * const info = file->private_data; > > lock_fb_info(info); > + if (info->fbdefio) > + fb_deferred_io_release(info); > if (info->fbops->fb_release) > info->fbops->fb_release(info,1); > module_put(info->fbops->owner); > diff --git a/include/linux/fb.h b/include/linux/fb.h > index 96b96323e9cb..73eb1f85ea8e 100644 > --- a/include/linux/fb.h > +++ b/include/linux/fb.h > @@ -662,6 +662,7 @@ extern int fb_deferred_io_init(struct fb_info *info); > extern void fb_deferred_io_open(struct fb_info *info, > struct inode *inode, > struct file *file); > +extern void fb_deferred_io_release(struct fb_info *info); > extern void fb_deferred_io_cleanup(struct fb_info *info); > extern int fb_deferred_io_fsync(struct file *file, loff_t start, > loff_t end, int datasync); > -- > 2.35.3 >
Hi Takashi,
I love your patch! Yet something to improve:
[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.2-rc5 next-20230127]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Takashi-Iwai/fbdev-Fix-invalid-page-access-after-closing-deferred-I-O-devices/20230128-180330
base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link: https://lore.kernel.org/r/20230127165834.11387-1-tiwai%40suse.de
patch subject: [PATCH] fbdev: Fix invalid page access after closing deferred I/O devices
config: s390-defconfig (https://download.01.org/0day-ci/archive/20230129/202301290917.puRyNsug-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/f28e22b16f34068d07913fa5d4fb2c9683aa8dc4
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Takashi-Iwai/fbdev-Fix-invalid-page-access-after-closing-deferred-I-O-devices/20230128-180330
git checkout f28e22b16f34068d07913fa5d4fb2c9683aa8dc4
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
drivers/video/fbdev/core/fbmem.c: In function 'fb_release':
>> drivers/video/fbdev/core/fbmem.c:1456:17: error: 'struct fb_info' has no member named 'fbdefio'
1456 | if (info->fbdefio)
| ^~
vim +1456 drivers/video/fbdev/core/fbmem.c
1447
1448 static int
1449 fb_release(struct inode *inode, struct file *file)
1450 __acquires(&info->lock)
1451 __releases(&info->lock)
1452 {
1453 struct fb_info * const info = file->private_data;
1454
1455 lock_fb_info(info);
> 1456 if (info->fbdefio)
1457 fb_deferred_io_release(info);
1458 if (info->fbops->fb_release)
1459 info->fbops->fb_release(info,1);
1460 module_put(info->fbops->owner);
1461 unlock_fb_info(info);
1462 put_fb_info(info);
1463 return 0;
1464 }
1465
On Fri, Jan 27, 2023 at 5:58 PM Takashi Iwai <tiwai@suse.de> wrote: > > When a fbdev with deferred I/O is once opened and closed, the dirty > pages still remain queued in the pageref list, and eventually later > those may be processed in the delayed work. This may lead to a > corruption of pages, hitting an Oops. > > This patch makes sure to cancel the delayed work and clean up the > pageref list at closing the device for addressing the bug. A part of > the cleanup code is factored out as a new helper function that is > called from the common fb_release(). > > Cc: <stable@vger.kernel.org> > Signed-off-by: Takashi Iwai <tiwai@suse.de> For some reason my first review didn't make it to the list. Trying again with my other email. As kernel test robot says, we need to check CONFIG_FB_DEFERRED_IO around access to info->fbdefio. With that fixed: Reviewed-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> > --- > drivers/video/fbdev/core/fb_defio.c | 10 +++++++++- > drivers/video/fbdev/core/fbmem.c | 2 ++ > include/linux/fb.h | 1 + > 3 files changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c > index c730253ab85c..583cbcf09446 100644 > --- a/drivers/video/fbdev/core/fb_defio.c > +++ b/drivers/video/fbdev/core/fb_defio.c > @@ -313,7 +313,7 @@ void fb_deferred_io_open(struct fb_info *info, > } > EXPORT_SYMBOL_GPL(fb_deferred_io_open); > > -void fb_deferred_io_cleanup(struct fb_info *info) > +void fb_deferred_io_release(struct fb_info *info) > { > struct fb_deferred_io *fbdefio = info->fbdefio; > struct page *page; > @@ -327,6 +327,14 @@ void fb_deferred_io_cleanup(struct fb_info *info) > page = fb_deferred_io_page(info, i); > page->mapping = NULL; > } > +} > +EXPORT_SYMBOL_GPL(fb_deferred_io_release); > + > +void fb_deferred_io_cleanup(struct fb_info *info) > +{ > + struct fb_deferred_io *fbdefio = info->fbdefio; > + > + fb_deferred_io_release(info); > > kvfree(info->pagerefs); > mutex_destroy(&fbdefio->lock); > diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c > index 3a6c8458eb8d..78c4cb5ee7c9 100644 > --- a/drivers/video/fbdev/core/fbmem.c > +++ b/drivers/video/fbdev/core/fbmem.c > @@ -1454,6 +1454,8 @@ __releases(&info->lock) > struct fb_info * const info = file->private_data; > > lock_fb_info(info); > + if (info->fbdefio) > + fb_deferred_io_release(info); > if (info->fbops->fb_release) > info->fbops->fb_release(info,1); > module_put(info->fbops->owner); > diff --git a/include/linux/fb.h b/include/linux/fb.h > index 96b96323e9cb..73eb1f85ea8e 100644 > --- a/include/linux/fb.h > +++ b/include/linux/fb.h > @@ -662,6 +662,7 @@ extern int fb_deferred_io_init(struct fb_info *info); > extern void fb_deferred_io_open(struct fb_info *info, > struct inode *inode, > struct file *file); > +extern void fb_deferred_io_release(struct fb_info *info); > extern void fb_deferred_io_cleanup(struct fb_info *info); > extern int fb_deferred_io_fsync(struct file *file, loff_t start, > loff_t end, int datasync); > -- > 2.35.3 >
diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index c730253ab85c..583cbcf09446 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -313,7 +313,7 @@ void fb_deferred_io_open(struct fb_info *info, } EXPORT_SYMBOL_GPL(fb_deferred_io_open); -void fb_deferred_io_cleanup(struct fb_info *info) +void fb_deferred_io_release(struct fb_info *info) { struct fb_deferred_io *fbdefio = info->fbdefio; struct page *page; @@ -327,6 +327,14 @@ void fb_deferred_io_cleanup(struct fb_info *info) page = fb_deferred_io_page(info, i); page->mapping = NULL; } +} +EXPORT_SYMBOL_GPL(fb_deferred_io_release); + +void fb_deferred_io_cleanup(struct fb_info *info) +{ + struct fb_deferred_io *fbdefio = info->fbdefio; + + fb_deferred_io_release(info); kvfree(info->pagerefs); mutex_destroy(&fbdefio->lock); diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 3a6c8458eb8d..78c4cb5ee7c9 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -1454,6 +1454,8 @@ __releases(&info->lock) struct fb_info * const info = file->private_data; lock_fb_info(info); + if (info->fbdefio) + fb_deferred_io_release(info); if (info->fbops->fb_release) info->fbops->fb_release(info,1); module_put(info->fbops->owner); diff --git a/include/linux/fb.h b/include/linux/fb.h index 96b96323e9cb..73eb1f85ea8e 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -662,6 +662,7 @@ extern int fb_deferred_io_init(struct fb_info *info); extern void fb_deferred_io_open(struct fb_info *info, struct inode *inode, struct file *file); +extern void fb_deferred_io_release(struct fb_info *info); extern void fb_deferred_io_cleanup(struct fb_info *info); extern int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasync);
When a fbdev with deferred I/O is once opened and closed, the dirty pages still remain queued in the pageref list, and eventually later those may be processed in the delayed work. This may lead to a corruption of pages, hitting an Oops. This patch makes sure to cancel the delayed work and clean up the pageref list at closing the device for addressing the bug. A part of the cleanup code is factored out as a new helper function that is called from the common fb_release(). Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> --- drivers/video/fbdev/core/fb_defio.c | 10 +++++++++- drivers/video/fbdev/core/fbmem.c | 2 ++ include/linux/fb.h | 1 + 3 files changed, 12 insertions(+), 1 deletion(-)