6.6-stable review patch. If anyone has any objections, please let me know.
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From: Bui Quang Minh minhquangbui99@gmail.com
[ Upstream commit da7c622cddd4fe36be69ca61e8c42e43cde94784 ]
Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from userspace to that buffer. Later, we use scanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using scanf. Fix this issue by using memdup_user_nul instead.
Fixes: a4f17cc72671 ("s390/cio: add CRW inject functionality") Signed-off-by: Bui Quang Minh minhquangbui99@gmail.com Reviewed-by: Heiko Carstens hca@linux.ibm.com Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-5-f1f1b53a10f4@gmail.com Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/s390/cio/cio_inject.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/s390/cio/cio_inject.c b/drivers/s390/cio/cio_inject.c index 8613fa937237b..a2e771ebae8eb 100644 --- a/drivers/s390/cio/cio_inject.c +++ b/drivers/s390/cio/cio_inject.c @@ -95,7 +95,7 @@ static ssize_t crw_inject_write(struct file *file, const char __user *buf, return -EINVAL; }
- buffer = vmemdup_user(buf, lbuf); + buffer = memdup_user_nul(buf, lbuf); if (IS_ERR(buffer)) return -ENOMEM;