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Kernel: Remove checks for signed numbers in the prctl syscall

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When doing PR_{SET,GET}_PROCESS_NAME, it's not expected to pass a signed
integer for the buffer size (in arg2). Therefore, cast it immediately to
a size_t integer type, and let the FixedStringBuffer StdLib memory copy
functions in such cases to worry about possible overflows.
This commit is contained in:
Liav A 2023-08-24 21:21:40 +03:00 • committed by Tim Schumacher
parent 13e2ca6b59
commit 6cb88e224e
Notes: sideshowbarker 2024-07-16 22:34:39 +09:00
1 changed files with 1 additions and 7 deletions
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8
Kernel/Syscalls/prctl.cpp
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@ -52,10 +52,7 @@ ErrorOr<FlatPtr> Process::sys$prctl(int option, FlatPtr arg1, FlatPtr arg2)
case PR_SET_PROCESS_NAME: {
TRY(require_promise(Pledge::proc));
Userspace<char const*> buffer = arg1;
int user_buffer_size = static_cast<int>(arg2);
if (user_buffer_size < 0)
return EINVAL;
size_t buffer_size = static_cast<size_t>(user_buffer_size);
size_t buffer_size = static_cast<size_t>(arg2);
Process::Name process_name {};
TRY(try_copy_name_from_user_into_fixed_string_buffer<32>(buffer, process_name, buffer_size));
// NOTE: Reject empty and whitespace-only names, as they only confuse users.
@ -67,9 +64,6 @@ ErrorOr<FlatPtr> Process::sys$prctl(int option, FlatPtr arg1, FlatPtr arg2)
case PR_GET_PROCESS_NAME: {
TRY(require_promise(Pledge::stdio));
Userspace<char*> buffer = arg1;
int user_buffer_size = arg2;
if (user_buffer_size < 0)
return EINVAL;
size_t buffer_size = static_cast<size_t>(arg2);
TRY(m_name.with([&buffer, buffer_size](auto& name) -> ErrorOr<void> {
auto view = name.representable_view();