* [PATCH] io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF
@ 2022-04-06 11:55 Eugene Syromiatnikov
2022-04-06 12:48 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Eugene Syromiatnikov @ 2022-04-06 11:55 UTC (permalink / raw)
To: Jens Axboe, Pavel Begunkov; +Cc: io-uring, linux-kernel, Artem Savkov
Similarly to the way it is done im mbind syscall.
Cc: [email protected] # 5.14
Fixes: fe76421d1da1dcdb ("io_uring: allow user configurable IO thread CPU affinity")
Signed-off-by: Eugene Syromiatnikov <[email protected]>
---
fs/io_uring.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index de9c9de..83e194f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -10803,7 +10803,15 @@ static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx,
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;
}
--
2.1.4
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2022-04-06 11:55 [PATCH] io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF Eugene Syromiatnikov
2022-04-06 12:48 ` Jens Axboe
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