10.10.2022 11:53, Helge Deller wrote:
On 10/9/22 08:08, WANG Xuerui wrote:
User space has been preferring this syscall for a while, due to its
closer match with C semantics, and newer platforms such as LoongArch
apparently have libc implementations that don't fallback to faccessat
so normal access checks are failing without the emulation in place.
Tested by successfully emerging several packages within a Gentoo loong
stage3 chroot, emulated on amd64 with help of static qemu-loongarch64.
Reported-by: Andreas K. Hüttel <dilfri...@gentoo.org>
Signed-off-by: WANG Xuerui <xe...@gentoo.org>
---
linux-user/strace.list | 3 +++
linux-user/syscall.c | 9 +++++++++
2 files changed, 12 insertions(+)
There were two similar approaches from Richard and me:
https://lore.kernel.org/qemu-devel/20220729201414.29869-1-richard.hender...@linaro.org/#t
and
https://lore.kernel.org/qemu-devel/YzLdcnL6x646T61W@p100/
So can we combine the 3 and actually implement it for good? :)
For loongarch64 users this has become essential, because this is a
new enough arch so that userspace does not bother using older syscalls,
in this case it uses faccessat2() for everything, and simplest programs
fail under qemu due to no fallback whatsoever.
Thanks,
/mjt
