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| author | Eugene Syromiatnikov <esyr@redhat.com> | 2022-04-06 14:55:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:59:22 +0300 |
| commit | fe223dd2f18b30dea66cee1174908a934e942e33 (patch) | |
| tree | a0e0e6a27be53b81ebe4efe78a7dc36c8eddc862 /fs | |
| parent | ae6cba337cbfda855b028f1e6ae83c22de4f5212 (diff) | |
| download | linux-fe223dd2f18b30dea66cee1174908a934e942e33.tar.xz | |
io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF
commit 0f5e4b83b37a96e3643951588ed7176b9b187c0a upstream.
Similarly to the way it is done im mbind syscall.
Cc: stable@vger.kernel.org # 5.14
Fixes: fe76421d1da1dcdb ("io_uring: allow user configurable IO thread CPU affinity")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/io_uring.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 6b71072f1408..a3a175965929 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10683,7 +10683,15 @@ static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, if (len > cpumask_size()) len = cpumask_size(); - if (copy_from_user(new_mask, arg, len)) { + if (in_compat_syscall()) { + ret = compat_get_bitmap(cpumask_bits(new_mask), + (const compat_ulong_t __user *)arg, + len * 8 /* CHAR_BIT */); + } else { + ret = copy_from_user(new_mask, arg, len); + } + + if (ret) { free_cpumask_var(new_mask); return -EFAULT; } |