diff options
| -rw-r--r-- | linux-user/syscall.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 8296e5e43f..3e21bb311c 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -3437,10 +3437,14 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, ret = 0; /* avoid warning */ break; case TARGET_NR_read: - if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0))) - goto efault; - ret = get_errno(read(arg1, p, arg3)); - unlock_user(p, arg2, ret); + if (arg3 == 0) + ret = 0; + else { + if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0))) + goto efault; + ret = get_errno(read(arg1, p, arg3)); + unlock_user(p, arg2, ret); + } break; case TARGET_NR_write: if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1))) @@ -3941,10 +3945,14 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, goto unimplemented; #endif case TARGET_NR_acct: - if (!(p = lock_user_string(arg1))) - goto efault; - ret = get_errno(acct(path(p))); - unlock_user(p, arg1, 0); + if (arg1 == 0) { + ret = get_errno(acct(NULL)); + } else { + if (!(p = lock_user_string(arg1))) + goto efault; + ret = get_errno(acct(path(p))); + unlock_user(p, arg1, 0); + } break; #ifdef TARGET_NR_umount2 /* not on alpha */ case TARGET_NR_umount2: |