From: "Ville Syrjälä" <ville.syrjala@linux.intel.com> To: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: DRI Development <dri-devel@lists.freedesktop.org>, Stephen Rothwell <sfr@canb.auug.org.au>, syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com, Kees Cook <keescook@chromium.org>, LKML <linux-kernel@vger.kernel.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Daniel Vetter <daniel.vetter@intel.com>, Andrew Morton <akpm@linux-foundation.org> Subject: Re: [PATCH] drm: Limit to INT_MAX in create_blob ioctl Date: Wed, 6 Nov 2019 19:03:17 +0200 [thread overview] Message-ID: <20191106170317.GU1208@intel.com> (raw) In-Reply-To: <20191106164755.31478-1-daniel.vetter@ffwll.ch> On Wed, Nov 06, 2019 at 05:47:55PM +0100, Daniel Vetter wrote: > The hardened usercpy code is too paranoid ever since: > > commit 6a30afa8c1fbde5f10f9c584c2992aa3c7f7a8fe > Author: Kees Cook <keescook@chromium.org> > Date: Wed Nov 6 16:07:01 2019 +1100 > > uaccess: disallow > INT_MAX copy sizes > > Code itself should have been fine as-is. > > Reported-by: syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com > Fixes: 6a30afa8c1fb ("uaccess: disallow > INT_MAX copy sizes") > Cc: Kees Cook <keescook@chromium.org> > Cc: Alexander Viro <viro@zeniv.linux.org.uk> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Stephen Rothwell <sfr@canb.auug.org.au> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > -- > Kees/Andrew, > > Since this is -mm can I have a stable sha1 or something for > referencing? Or do you want to include this in the -mm patch bomb for > the merge window? > -Daniel > --- > drivers/gpu/drm/drm_property.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c > index 892ce636ef72..6ee04803c362 100644 > --- a/drivers/gpu/drm/drm_property.c > +++ b/drivers/gpu/drm/drm_property.c > @@ -561,7 +561,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length, > struct drm_property_blob *blob; > int ret; > > - if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob)) > + if (!length || length > INT_MAX - sizeof(struct drm_property_blob)) > return ERR_PTR(-EINVAL); INT_MAX should be more than enough. Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> > > blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); > -- > 2.24.0.rc2 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Ville Syrjälä Intel
WARNING: multiple messages have this Message-ID (diff)
From: "Ville Syrjälä" <ville.syrjala@linux.intel.com> To: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Stephen Rothwell <sfr@canb.auug.org.au>, syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com, Kees Cook <keescook@chromium.org>, LKML <linux-kernel@vger.kernel.org>, DRI Development <dri-devel@lists.freedesktop.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Daniel Vetter <daniel.vetter@intel.com>, Andrew Morton <akpm@linux-foundation.org> Subject: Re: [PATCH] drm: Limit to INT_MAX in create_blob ioctl Date: Wed, 6 Nov 2019 19:03:17 +0200 [thread overview] Message-ID: <20191106170317.GU1208@intel.com> (raw) Message-ID: <20191106170317.qgP2nBn7NqpX85Bw2pbW8DyYx8zRQCj_QbsC7XurExc@z> (raw) In-Reply-To: <20191106164755.31478-1-daniel.vetter@ffwll.ch> On Wed, Nov 06, 2019 at 05:47:55PM +0100, Daniel Vetter wrote: > The hardened usercpy code is too paranoid ever since: > > commit 6a30afa8c1fbde5f10f9c584c2992aa3c7f7a8fe > Author: Kees Cook <keescook@chromium.org> > Date: Wed Nov 6 16:07:01 2019 +1100 > > uaccess: disallow > INT_MAX copy sizes > > Code itself should have been fine as-is. > > Reported-by: syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com > Fixes: 6a30afa8c1fb ("uaccess: disallow > INT_MAX copy sizes") > Cc: Kees Cook <keescook@chromium.org> > Cc: Alexander Viro <viro@zeniv.linux.org.uk> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Stephen Rothwell <sfr@canb.auug.org.au> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > -- > Kees/Andrew, > > Since this is -mm can I have a stable sha1 or something for > referencing? Or do you want to include this in the -mm patch bomb for > the merge window? > -Daniel > --- > drivers/gpu/drm/drm_property.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c > index 892ce636ef72..6ee04803c362 100644 > --- a/drivers/gpu/drm/drm_property.c > +++ b/drivers/gpu/drm/drm_property.c > @@ -561,7 +561,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length, > struct drm_property_blob *blob; > int ret; > > - if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob)) > + if (!length || length > INT_MAX - sizeof(struct drm_property_blob)) > return ERR_PTR(-EINVAL); INT_MAX should be more than enough. Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> > > blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); > -- > 2.24.0.rc2 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Ville Syrjälä Intel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2019-11-06 17:03 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-06 16:47 [PATCH] drm: Limit to INT_MAX in create_blob ioctl Daniel Vetter 2019-11-06 16:47 ` Daniel Vetter 2019-11-06 17:03 ` Ville Syrjälä [this message] 2019-11-06 17:03 ` Ville Syrjälä 2019-11-06 17:24 ` Kees Cook 2019-11-06 17:24 ` Kees Cook 2019-11-06 17:56 ` Daniel Vetter 2019-11-06 17:56 ` Daniel Vetter 2019-11-06 18:13 ` Andrew Morton 2019-11-06 18:13 ` Andrew Morton
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