[PATCH] amd64-agp: fix arbitrary kernel memory writes

From: Young Xiao
Date: Wed May 29 2019 - 00:54:19 EST


pg_start is copied from userspace on AGPIOC_BIND and AGPIOC_UNBIND ioctl
cmds of agp_ioctl() and passed to agpioc_bind_wrap(). As said in the
comment, (pg_start + mem->page_count) may wrap in case of AGPIOC_BIND,
and it is not checked at all in case of AGPIOC_UNBIND. As a result, user
with sufficient privileges (usually "video" group) may generate either
local DoS or privilege escalation.

See commit 194b3da873fd ("agp: fix arbitrary kernel memory writes")
for details.

Signed-off-by: Young Xiao <92siuyang@xxxxxxxxx>
---
drivers/char/agp/amd64-agp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index c69e39f..5daa0e3 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -60,7 +60,8 @@ static int amd64_insert_memory(struct agp_memory *mem, off_t pg_start, int type)

/* Make sure we can fit the range in the gatt table. */
/* FIXME: could wrap */
- if (((unsigned long)pg_start + mem->page_count) > num_entries)
+ if (((pg_start + mem->page_count) > num_entries) ||
+ ((pg_start + mem->page_count) < pg_start))
return -EINVAL;

j = pg_start;
--
2.7.4