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Date: Mon, 26 Oct 2020 18:03:18 -0600 From: Jens Axboe <axboe@...nel.dk> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, Kyle Huey <me@...ehuey.com> Subject: [PATCH] Fix compat regression in process_vm_rw() The removal of compat_process_vm_{readv,writev} didn't change process_vm_rw(), which always assumes it's not doing a compat syscall. Instead of passing in 'false' unconditionally for 'compat', make it conditional on in_compat_syscall(). Fixes: c3973b401ef2 ("mm: remove compat_process_vm_{readv,writev}") Reported-by: Kyle Huey <me@...ehuey.com> Signed-off-by: Jens Axboe <axboe@...nel.dk> --- 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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