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Kernel: Mask kernel addresses in backtraces and profiles

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Addresses outside the userspace virtual range will now show up as
0xdeadc0de in backtraces and profiles generated by unprivileged users.
This commit is contained in:
Andreas Kling 2020-01-02 20:49:21 +01:00
parent 8eb20bdfa2
commit 32ec1e5aed
4 changed files with 24 additions and 14 deletions
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6
Kernel/FileSystem/ProcFS.cpp
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@ -365,6 +365,7 @@ Optional<KBuffer> procfs$profile(InodeIdentifier)
InterruptDisabler disabler;
KBufferBuilder builder;
JsonArraySerializer array(builder);
bool mask_kernel_addresses = !current->process().is_superuser();
Profiling::for_each_sample([&](auto& sample) {
auto object = array.add_object();
object.add("pid", sample.pid);
@ -375,7 +376,10 @@ Optional<KBuffer> procfs$profile(InodeIdentifier)
if (sample.frames[i] == 0)
break;
auto frame_object = frames_array.add_object();
frame_object.add("address", JsonValue((u32)sample.frames[i]));
u32 address = (u32)sample.frames[i];
if (mask_kernel_addresses && !is_user_address(VirtualAddress(address)))
address = 0xdeadc0de;
frame_object.add("address", address);
frame_object.add("symbol", sample.symbolicated_frames[i]);
frame_object.add("offset", JsonValue((u32)sample.offsets[i]));
frame_object.finish();