Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag
From: Christoph Hellwig <hch@lst.de>
Date: 2020-09-18 13:44:13
Also in:
io-uring, keyrings, linux-arch, linux-arm-kernel, linux-block, linux-fsdevel, linux-mips, linux-mm, linux-s390, linux-scsi, linux-security-module, lkml, netdev, sparclinux
On Fri, Sep 18, 2020 at 02:40:12PM +0100, Al Viro wrote:
quoted
/* Vector 0x110 is LINUX_32BIT_SYSCALL_TRAP */ - return pt_regs_trap_type(current_pt_regs()) == 0x110; + return pt_regs_trap_type(current_pt_regs()) == 0x110 || + (current->flags & PF_FORCE_COMPAT);Can't say I like that approach ;-/ Reasoning about the behaviour is much harder when it's controlled like that - witness set_fs() shite...
I don't particularly like it either. But do you have a better idea how to deal with io_uring vs compat tasks?