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Kernel: Convert remaining users of copy_string_from_user()

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This patch replaces the remaining users of this API with the new
try_copy_kstring_from_user() instead. Note that we still convert to a
String for continued processing, and I've added FIXME about continuing
work on using KString all the way.
This commit is contained in:
Andreas Kling 2021-08-14 23:00:06 +02:00
parent 9509433e25
commit 0f6f863382
Notes: sideshowbarker 2024-07-18 05:40:15 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/0f6f8633829
4 changed files with 21 additions and 15 deletions
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8
Kernel/Syscalls/execve.cpp
View file

@ -970,9 +970,13 @@ KResultOr<FlatPtr> Process::sys$execve(Userspace<const Syscall::SC_execve_params
if (!copy_from_user(strings.data(), list.strings, size.value()))
return false;
for (size_t i = 0; i < list.length; ++i) {
auto string = copy_string_from_user(strings[i]);
if (string.is_null())
auto string_or_error = try_copy_kstring_from_user(strings[i]);
if (string_or_error.is_error()) {
// FIXME: Propagate the error.
return false;
}
// FIXME: Don't convert to String here, use KString all the way.
auto string = String(string_or_error.value()->view());
if (!output.try_append(move(string)))
return false;
}

9
Kernel/Syscalls/hostname.cpp
View file

@ -32,10 +32,11 @@ KResultOr<FlatPtr> Process::sys$sethostname(Userspace<const char*> buffer, size_
if (length > 64)
return ENAMETOOLONG;
return hostname().with_exclusive([&](auto& name) -> KResultOr<FlatPtr> {
auto copied_hostname = copy_string_from_user(buffer, length);
if (copied_hostname.is_null())
return EFAULT;
name = move(copied_hostname);
auto name_or_error = try_copy_kstring_from_user(buffer, length);
if (name_or_error.is_error())
return name_or_error.error();
// FIXME: Use KString instead of String here.
name = name_or_error.value()->view();
return 0;
});
}

8
Kernel/Syscalls/module.cpp
View file

@ -155,11 +155,11 @@ KResultOr<FlatPtr> Process::sys$module_unload(Userspace<const char*> user_name,
REQUIRE_NO_PROMISES;
auto module_name = copy_string_from_user(user_name, name_length);
if (module_name.is_null())
return EFAULT;
auto module_name_or_error = try_copy_kstring_from_user(user_name, name_length);
if (module_name_or_error.is_error())
return module_name_or_error.error();
auto it = g_modules->find(module_name);
auto it = g_modules->find(module_name_or_error.value()->view());
if (it == g_modules->end())
return ENOENT;

11
Kernel/Syscalls/process.cpp
View file

@ -41,13 +41,14 @@ KResultOr<FlatPtr> Process::sys$set_process_name(Userspace<const char*> user_nam
REQUIRE_PROMISE(proc);
if (user_name_length > 256)
return ENAMETOOLONG;
auto name = copy_string_from_user(user_name, user_name_length);
if (name.is_null())
return EFAULT;
auto name_or_error = try_copy_kstring_from_user(user_name, user_name_length);
if (name_or_error.is_error())
return name_or_error.error();
// Empty and whitespace-only names only exist to confuse users.
if (name.is_whitespace())
if (name_or_error.value()->view().is_whitespace())
return EINVAL;
m_name = move(name);
// FIXME: There's a String copy here. Process::m_name should be a KString.
m_name = name_or_error.value()->view();
return 0;
}