getgroups() and getgroups32() returns NGROUPS_MAX when both its two args are zero. But because we pass a ptr to allocated space as 2nd arg, this function are interfered. The patch attached fixed it. /yoshii --- linux-user/syscall.c: fix getgroups{,32} when both args are zero.
diff --git a/linux-user/syscall.c b/linux-user/syscall.c --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -5185,7 +5185,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, ret = get_errno(setregid(low2highgid(arg1), low2highgid(arg2))); break; case TARGET_NR_getgroups: - { + if (arg1 == 0 && arg2 == 0) + ret = get_errno(getgroups(0, 0)); + else { int gidsetsize = arg1; uint16_t *target_grouplist; gid_t *grouplist; @@ -5335,7 +5337,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, #endif #ifdef TARGET_NR_getgroups32 case TARGET_NR_getgroups32: - { + if (arg1 == 0 && arg2 == 0) + ret = get_errno(getgroups(0, 0)); + else { int gidsetsize = arg1; uint32_t *target_grouplist; gid_t *grouplist;