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Re: [musl] Re: [PATCHv3 00/24] ILP32 support in ARM64
- From: Szabolcs Nagy <nsz at port70 dot net>
- To: musl at lists dot openwall dot com, Rich Felker <dalias at libc dot org>, Andrew Pinski <apinski at cavium dot com>, "linux-arm-kernel at lists dot infradead dot org" <linux-arm-kernel at lists dot infradead dot org>, "linux-kernel at vger dot kernel dot org" <linux-kernel at vger dot kernel dot org>, "pinskia at gmail dot com" <pinskia at gmail dot com>, "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>, Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>
- Date: Thu, 12 Feb 2015 09:12:34 +0100
- Subject: Re: [musl] Re: [PATCHv3 00/24] ILP32 support in ARM64
- Authentication-results: sourceware.org; auth=none
- References: <20141002155217 dot GH32147 at e104818-lin dot cambridge dot arm dot com> <20150210181302 dot GA23886 at brightrain dot aerifal dot cx> <20150211173919 dot GF9058 at e104818-lin dot cambridge dot arm dot com> <20150211190537 dot GK32724 at port70 dot net>
* Szabolcs Nagy <nsz@port70.net> [2015-02-11 20:05:37 +0100]:
>
> (i think this is also a problem if userspace code uses syscall(2) directly,
> libc cannot possibly know where to signextend and the kernel side does not
> do the fixup right now)
>
nobody picked up this issue, is this resolved?
ie. if userspace calls syscall(SYS_foo,...) directly with 32bit
longs does it always work out correctly on the kernel side?
the sign extension is a problem for signed long arguments,
i only found these in the kernel:
fs/buffer.c:SYSCALL_DEFINE2(bdflush, int, func, long, data)
fs/open.c:SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
fs/aio.c:SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
fs/aio.c- struct iocb __user * __user *, iocbpp)
fs/aio.c:SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
fs/aio.c- long, min_nr,
fs/aio.c- long, nr,
kernel/ptrace.c:SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
kernel/ptrace.c- unsigned long, data)
ipc/syscall.c:SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
ipc/syscall.c- unsigned long, third, void __user *, ptr, long, fifth)