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https://github.com/Divested-Mobile/DivestOS-Build.git
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83 lines
2.5 KiB
Diff
83 lines
2.5 KiB
Diff
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From 2dc705a9930b4806250fbf5a76e55266e59389f2 Mon Sep 17 00:00:00 2001
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From: Kees Cook <keescook@chromium.org>
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Date: Tue, 24 Jan 2017 15:18:24 -0800
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Subject: fbdev: color map copying bounds checking
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Copying color maps to userspace doesn't check the value of to->start,
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which will cause kernel heap buffer OOB read due to signedness wraps.
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CVE-2016-8405
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Link: http://lkml.kernel.org/r/20170105224249.GA50925@beast
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Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
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Signed-off-by: Kees Cook <keescook@chromium.org>
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Reported-by: Peter Pi (@heisecode) of Trend Micro
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Cc: Min Chong <mchong@google.com>
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Cc: Dan Carpenter <dan.carpenter@oracle.com>
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Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
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Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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drivers/video/fbdev/core/fbcmap.c | 26 ++++++++++++++------------
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1 file changed, 14 insertions(+), 12 deletions(-)
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diff --git a/drivers/video/fbdev/core/fbcmap.c b/drivers/video/fbdev/core/fbcmap.c
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index f89245b..68a1135 100644
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--- a/drivers/video/fbdev/core/fbcmap.c
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+++ b/drivers/video/fbdev/core/fbcmap.c
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@@ -163,17 +163,18 @@ void fb_dealloc_cmap(struct fb_cmap *cmap)
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int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
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{
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- int tooff = 0, fromoff = 0;
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- int size;
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+ unsigned int tooff = 0, fromoff = 0;
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+ size_t size;
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if (to->start > from->start)
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fromoff = to->start - from->start;
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else
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tooff = from->start - to->start;
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- size = to->len - tooff;
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- if (size > (int) (from->len - fromoff))
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- size = from->len - fromoff;
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- if (size <= 0)
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+ if (fromoff >= from->len || tooff >= to->len)
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+ return -EINVAL;
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+
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+ size = min_t(size_t, to->len - tooff, from->len - fromoff);
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+ if (size == 0)
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return -EINVAL;
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size *= sizeof(u16);
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@@ -187,17 +188,18 @@ int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
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int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
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{
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- int tooff = 0, fromoff = 0;
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- int size;
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+ unsigned int tooff = 0, fromoff = 0;
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+ size_t size;
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if (to->start > from->start)
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fromoff = to->start - from->start;
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else
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tooff = from->start - to->start;
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- size = to->len - tooff;
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- if (size > (int) (from->len - fromoff))
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- size = from->len - fromoff;
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- if (size <= 0)
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+ if (fromoff >= from->len || tooff >= to->len)
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+ return -EINVAL;
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+
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+ size = min_t(size_t, to->len - tooff, from->len - fromoff);
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+ if (size == 0)
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return -EINVAL;
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size *= sizeof(u16);
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--
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cgit v1.1
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