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Date:   Mon, 26 Oct 2020 17:56:11 -0600
From:   Jens Axboe <>
To:     Kyle Huey <>,
        open list <>,
        Christoph Hellwig <>
Cc:     Robert O'Callahan <>,
        Alexander Viro <>,
        Andrew Morton <>,
        Arnd Bergmann <>,
        David Howells <>,
        "moderated list:ARM PORT" <>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <>,,,,,,,,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        Linus Torvalds <>
Subject: Re: [REGRESSION] mm: process_vm_readv testcase no longer works after
 compat_prcoess_vm_readv removed

On 10/26/20 4:55 PM, Kyle Huey wrote:
> A test program from the rr[0] test suite, vm_readv_writev[1], no
> longer works on 5.10-rc1 when compiled as a 32 bit binary and executed
> on a 64 bit kernel. The first process_vm_readv call (on line 35) now
> fails with EFAULT. I have bisected this to
> c3973b401ef2b0b8005f8074a10e96e3ea093823.
> It should be fairly straightforward to extract the test case from our
> repository into a standalone program.

Can you check with this applied?

diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index fd12da80b6f2..05676722d9cd 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -273,7 +273,8 @@ static ssize_t process_vm_rw(pid_t pid,
 		return rc;
 	if (!iov_iter_count(&iter))
 		goto free_iov_l;
-	iov_r = iovec_from_user(rvec, riovcnt, UIO_FASTIOV, iovstack_r, false);
+	iov_r = iovec_from_user(rvec, riovcnt, UIO_FASTIOV, iovstack_r,
+				in_compat_syscall());
 	if (IS_ERR(iov_r)) {
 		rc = PTR_ERR(iov_r);
 		goto free_iov_l;

Jens Axboe

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