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authorAndrea Arcangeli <aarcange@redhat.com>2015-09-04 15:47:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 16:54:41 -0700
commite6485a47b758cae04a496764a1095961ee3249e4 (patch)
tree4af5c94f07e56f99574a2c0b87c2da4c65d36446
parentad465cae96b456b48d26c96f27a0577ba443472a (diff)
userfaultfd: require UFFDIO_API before other ioctls
UFFDIO_API was already forced before read/poll could work. This makes the code more strict to force it also for all other ioctls. All users would already have been required to call UFFDIO_API before invoking other ioctls but this makes it more explicit. This will ensure we can change all ioctls (all but UFFDIO_API/struct uffdio_api) with a bump of uffdio_api.api. There's no actual plan or need to change the API or the ioctl, the current API already should cover fine even the non cooperative usage, but this is just for the longer term future just in case. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/userfaultfd.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 5f11678907d5..af88ef6fffff 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -577,7 +577,6 @@ static ssize_t userfaultfd_read(struct file *file, char __user *buf,
if (ctx->state == UFFD_STATE_WAIT_API)
return -EINVAL;
- BUG_ON(ctx->state != UFFD_STATE_RUNNING);
for (;;) {
if (count < sizeof(msg))
@@ -1115,6 +1114,9 @@ static long userfaultfd_ioctl(struct file *file, unsigned cmd,
int ret = -EINVAL;
struct userfaultfd_ctx *ctx = file->private_data;
+ if (cmd != UFFDIO_API && ctx->state == UFFD_STATE_WAIT_API)
+ return -EINVAL;
+
switch(cmd) {
case UFFDIO_API:
ret = userfaultfd_api(ctx, arg);