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Kernel: Make copy_{from,to}_user() return KResult and use TRY()

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This makes EFAULT propagation flow much more naturally. :^)
This commit is contained in:
Andreas Kling 2021-09-05 17:38:37 +02:00
parent 9903f5c6ef
commit 48a0b31c47
57 changed files with 318 additions and 551 deletions
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13
Kernel/Syscalls/stat.cpp
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@ -19,10 +19,8 @@ KResultOr<FlatPtr> Process::sys$fstat(int fd, Userspace<stat*> user_statbuf)
if (!description)
return EBADF;
stat buffer = {};
auto result = description->stat(buffer);
if (!copy_to_user(user_statbuf, &buffer))
return EFAULT;
return result;
TRY(description->stat(buffer));
return copy_to_user(user_statbuf, &buffer);
}
KResultOr<FlatPtr> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> user_params)
@ -30,8 +28,7 @@ KResultOr<FlatPtr> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> u
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(rpath);
Syscall::SC_stat_params params;
if (!copy_from_user(&params, user_params))
return EFAULT;
TRY(copy_from_user(&params, user_params));
auto path = get_syscall_path_argument(params.path);
if (path.is_error())
return path.error();
@ -55,9 +52,7 @@ KResultOr<FlatPtr> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> u
auto result = metadata_or_error.value().stat(statbuf);
if (result.is_error())
return result;
if (!copy_to_user(params.statbuf, &statbuf))
return EFAULT;
return 0;
return copy_to_user(params.statbuf, &statbuf);
}
}