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Kernel: Fixed argument passing for profiling_enable syscall

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Arguments larger than 32bit need to be passed as a pointer on a 32bit
architectures. sys$profiling_enable has u64 event_mask argument,
which means that it needs to be passed as an pointer. Previously upper
32bits were filled by garbage.
This commit is contained in:
Jakub Berkop 2022-02-18 22:12:35 +01:00 committed by Andreas Kling
parent 0f2e18403c
commit 895a050e04
4 changed files with 9 additions and 4 deletions
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2
Kernel/Process.h
View file

@ -390,7 +390,7 @@ public:
ErrorOr<FlatPtr> sys$getrandom(Userspace<void*>, size_t, unsigned int);
ErrorOr<FlatPtr> sys$getkeymap(Userspace<const Syscall::SC_getkeymap_params*>);
ErrorOr<FlatPtr> sys$setkeymap(Userspace<const Syscall::SC_setkeymap_params*>);
ErrorOr<FlatPtr> sys$profiling_enable(pid_t, u64);
ErrorOr<FlatPtr> sys$profiling_enable(pid_t, Userspace<u64 const*>);
ErrorOr<FlatPtr> sys$profiling_disable(pid_t);
ErrorOr<FlatPtr> sys$profiling_free_buffer(pid_t);
ErrorOr<FlatPtr> sys$futex(Userspace<const Syscall::SC_futex_params*>);

6
Kernel/Syscalls/profiling.cpp
View file

@ -16,11 +16,15 @@ bool g_profiling_all_threads;
PerformanceEventBuffer* g_global_perf_events;
u64 g_profiling_event_mask;
ErrorOr<FlatPtr> Process::sys$profiling_enable(pid_t pid, u64 event_mask)
// NOTE: event_mask needs to be passed as a pointer as u64
// does not fit into a register on 32bit architectures.
ErrorOr<FlatPtr> Process::sys$profiling_enable(pid_t pid, Userspace<u64 const*> userspace_event_mask)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_no_promises());
const auto event_mask = TRY(copy_typed_from_user(userspace_event_mask));
if (pid == -1) {
if (!is_superuser())
return EPERM;

3
Kernel/init.cpp
View file

@ -373,7 +373,8 @@ void init_stage2(void*)
if (boot_profiling) {
dbgln("Starting full system boot profiling");
MutexLocker mutex_locker(Process::current().big_lock());
auto result = Process::current().sys$profiling_enable(-1, ~0ull);
const auto enable_all = ~(u64)0;
auto result = Process::current().sys$profiling_enable(-1, reinterpret_cast<FlatPtr>(&enable_all));
VERIFY(!result.is_error());
}

2
Userland/Libraries/LibC/serenity.cpp
View file

@ -22,7 +22,7 @@ int disown(pid_t pid)
int profiling_enable(pid_t pid, uint64_t event_mask)
{
int rc = syscall(SC_profiling_enable, pid, event_mask);
int rc = syscall(SC_profiling_enable, pid, &event_mask);
__RETURN_WITH_ERRNO(rc, rc, -1);
}