Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag
From: Arnd Bergmann <arnd@arndb.de>
Date: 2020-09-20 16:05:34
Also in:
io-uring, keyrings, linux-arch, linux-block, linux-fsdevel, linux-mips, linux-mm, linux-s390, linux-scsi, linux-security-module, linuxppc-dev, lkml, netdev, sparclinux
On Sun, Sep 20, 2020 at 5:15 PM Matthew Wilcox [off-list ref] wrote:
On Fri, Sep 18, 2020 at 02:45:25PM +0200, Christoph Hellwig wrote:quoted
Add a flag to force processing a syscall as a compat syscall. This is required so that in_compat_syscall() works for I/O submitted by io_uring helper threads on behalf of compat syscalls.Al doesn't like this much, but my suggestion is to introduce two new opcodes -- IORING_OP_READV32 and IORING_OP_WRITEV32. The compat code can translate IORING_OP_READV to IORING_OP_READV32 and then the core code can know what that user pointer is pointing to.
How is that different from the current approach of storing the ABI as
a flag in ctx->compat?
Arnd
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