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| author |   Jason Gunthorpe <jgunthorpe@obsidianresearch.com> | 2016-04-10 19:13:13 -0600 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-04-28 12:03:16 -0400 |
| commit | e6bd18f57aad1a2d1ef40e646d03ed0f2515c9e3 (patch) | |
| tree | 62a0a5f3cf239387c095c8b99c67d2bcf9448071 /drivers/infiniband/core/uverbs_main.c | |
| parent | IB/hfi1: Use kernel default llseek for ui device (diff) | |
| download | linux-dev-e6bd18f57aad1a2d1ef40e646d03ed0f2515c9e3.tar.xz linux-dev-e6bd18f57aad1a2d1ef40e646d03ed0f2515c9e3.zip | |
IB/security: Restrict use of the write() interface
The drivers/infiniband stack uses write() as a replacement for
bi-directional ioctl(). This is not safe. There are ways to
trigger write calls that result in the return structure that
is normally written to user space being shunted off to user
specified kernel memory instead.
For the immediate repair, detect and deny suspicious accesses to
the write API.
For long term, update the user space libraries and the kernel API
to something that doesn't present the same security vulnerabilities
(likely a structured ioctl() interface).
The impacted uAPI interfaces are generally only available if
hardware from drivers/infiniband is installed in the system.
Reported-by: Jann Horn <jann@thejh.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
[ Expanded check to all known write() entry points ]
Cc: stable@vger.kernel.org
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/core/uverbs_main.c')
| -rw-r--r-- | drivers/infiniband/core/uverbs_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c index 28ba2cc81535..31f422a70623 100644 --- a/drivers/infiniband/core/uverbs_main.c +++ b/drivers/infiniband/core/uverbs_main.c @@ -48,6 +48,8 @@ #include <asm/uaccess.h> +#include <rdma/ib.h> + #include "uverbs.h" MODULE_AUTHOR("Roland Dreier"); @@ -709,6 +711,9 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, int srcu_key; ssize_t ret; + if (WARN_ON_ONCE(!ib_safe_file_access(filp))) + return -EACCES; + if (count < sizeof hdr) return -EINVAL; |