From 6fb53cf8ff2c4713247df523404d24f466b98f52 Mon Sep 17 00:00:00 2001 From: Dylan Yudaken Date: Tue, 12 Apr 2022 09:30:41 -0700 Subject: io_uring: verify resv is 0 in ringfd register/unregister Only allow resv field to be 0 in struct io_uring_rsrc_update user arguments. Fixes: e7a6c00dc77a ("io_uring: add support for registering ring file descriptors") Signed-off-by: Dylan Yudaken Link: https://lore.kernel.org/r/20220412163042.2788062-4-dylany@fb.com Signed-off-by: Jens Axboe --- fs/io_uring.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/io_uring.c b/fs/io_uring.c index e899192ffb77..a84bfec97d0d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10533,6 +10533,11 @@ static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, break; } + if (reg.resv) { + ret = -EINVAL; + break; + } + if (reg.offset == -1U) { start = 0; end = IO_RINGFD_REG_MAX; @@ -10579,7 +10584,7 @@ static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, ret = -EFAULT; break; } - if (reg.offset >= IO_RINGFD_REG_MAX) { + if (reg.resv || reg.offset >= IO_RINGFD_REG_MAX) { ret = -EINVAL; break; } -- cgit v1.2.3