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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-12-16 13:42:06 -0500 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-13 12:34:37 +0200 |
| commit | 8beb20c102f60ae941f4c0644e5100465bf09c9d (patch) | |
| tree | 5d4246dfb8a711a0a9e341272feb733b6dd86b1b /block/bsg.c | |
| parent | d01d5036e5f84f36c83054ec6a8195f6bc2d1991 (diff) | |
sg_write()/bsg_write() is not fit to be called under KERNEL_DS
Both damn things interpret userland pointers embedded into the payload;
worse, they are actually traversing those. Leaving aside the bad
API design, this is very much _not_ safe to call with KERNEL_DS.
Bail out early if that happens.
Change-Id: I383485b4d44970eb61b7178c0b9a4376abfe8cd1
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Corinna Vinschen <xda@vinschen.de>
Diffstat (limited to 'block/bsg.c')
| -rw-r--r-- | block/bsg.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bsg.c b/block/bsg.c index 420a5a9f1..76801e57f 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -675,6 +675,9 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) dprintk("%s: write %Zd bytes\n", bd->name, count); + if (unlikely(segment_eq(get_fs(), KERNEL_DS))) + return -EINVAL; + bsg_set_block(bd, file); bytes_written = 0; |