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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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6
Kernel/Syscalls/readlink.cpp
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@ -16,8 +16,7 @@ KResultOr<FlatPtr> Process::sys$readlink(Userspace<const Syscall::SC_readlink_pa
REQUIRE_PROMISE(rpath);
Syscall::SC_readlink_params params;
if (!copy_from_user(&params, user_params))
return EFAULT;
TRY(copy_from_user(&params, user_params));
auto path = get_syscall_path_argument(params.path);
if (path.is_error())
@ -37,8 +36,7 @@ KResultOr<FlatPtr> Process::sys$readlink(Userspace<const Syscall::SC_readlink_pa
auto& link_target = *contents.value();
auto size_to_copy = min(link_target.size(), params.buffer.size);
if (!copy_to_user(params.buffer.data, link_target.data(), size_to_copy))
return EFAULT;
TRY(copy_to_user(params.buffer.data, link_target.data(), size_to_copy));
// Note: we return the whole size here, not the copied size.
return link_target.size();
}