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(+) diff --git a/linux-user/strace.list b/linux-user/strace.list index a87415bf3d..3df2184580 100644 --- a/linux-user/strace.list +++ b/linux-user/strace.list @@ -178,6 +178,9 @@ #ifdef TARGET_NR_faccessat { TARGET_NR_faccessat, "faccessat" , NULL, print_faccessat, NULL }, #endif +#ifdef TARGET_NR_faccessat2 +{ TARGET_NR_faccessat2, "faccessat2" , NULL, print_faccessat, NULL }, +#endif #ifdef TARGET_NR_fadvise64 { TARGET_NR_fadvise64, "fadvise64" , NULL, NULL, NULL }, #endif diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 2e954d8dbd..a81f0b65b9 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -9110,6 +9110,15 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1, unlock_user(p, arg2, 0); return ret; #endif +#if defined(TARGET_NR_faccessat2) && defined(__NR_faccessat2) + case TARGET_NR_faccessat2: + if (!(p = lock_user_string(arg2))) { + return -TARGET_EFAULT; + } + ret = get_errno(faccessat(arg1, p, arg3, arg4)); + unlock_user(p, arg2, 0); + return ret; +#endif #ifdef TARGET_NR_nice /* not on alpha */ case TARGET_NR_nice: return get_errno(nice(arg1)); -- 2.38.0