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[lldb][Process/FreeBSDKernelCore] Set kernel displacement #183975

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Merged
mchoo7 merged 5 commits into from
Mar 13, 2026
Merged

[lldb][Process/FreeBSDKernelCore] Set kernel displacement #183975

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af81454
[lldb][Process/FreeBSDKernelCore] Load core according to KASLR
mchoo7 Mar 1, 2026
891e866
fixup! [lldb][Process/FreeBSDKernelCore] Load core according to KASLR
mchoo7 Mar 2, 2026
2f8efb7
fixup! [lldb][Process/FreeBSDKernelCore] Load core according to KASLR
mchoo7 Mar 4, 2026
574a836
fixup! [lldb][Process/FreeBSDKernelCore] Load core according to KASLR
mchoo7 Mar 12, 2026
e0e0236
fixup! [lldb][Process/FreeBSDKernelCore] Load core according to KASLR
mchoo7 Mar 13, 2026
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25 changes: 25 additions & 0 deletions lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,8 @@ bool ProcessFreeBSDKernelCore::CanDebug(lldb::TargetSP target_sp,

Status ProcessFreeBSDKernelCore::DoLoadCore() {
// The core is already loaded by CreateInstance().
SetKernelDisplacement();

return Status();
}

Expand Down Expand Up @@ -324,6 +326,29 @@ lldb::addr_t ProcessFreeBSDKernelCore::FindSymbol(const char *name) {
return sym ? sym->GetLoadAddress(&GetTarget()) : LLDB_INVALID_ADDRESS;
}

void ProcessFreeBSDKernelCore::SetKernelDisplacement() {
kssize_t displacement = kvm_kerndisp(m_kvm);

if (displacement == 0)
return;

Target &target = GetTarget();
lldb::ModuleSP kernel_module_sp = target.GetExecutableModule();
if (!kernel_module_sp)
return;

bool changed = false;
kernel_module_sp->SetLoadAddress(target,
static_cast<lldb::addr_t>(displacement),
/*value_is_offset=*/true, changed);

if (changed) {
ModuleList loaded_module_list;
loaded_module_list.Append(kernel_module_sp);
target.ModulesDidLoad(loaded_module_list);
}
}

void ProcessFreeBSDKernelCore::PrintUnreadMessage() {
Target &target = GetTarget();
Debugger &debugger = target.GetDebugger();
Expand Down
2 changes: 2 additions & 0 deletions lldb/source/Plugins/Process/FreeBSD-Kernel-Core/ProcessFreeBSDKernelCore.h
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Expand Up @@ -64,6 +64,8 @@ class ProcessFreeBSDKernelCore : public lldb_private::PostMortemProcess {
lldb::addr_t FindSymbol(const char *name);

private:
void SetKernelDisplacement();

void PrintUnreadMessage();

const char *GetError();
Expand Down