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Kernel: Don't use copy_from_user() for kernelspace read in perf events

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Fixes #3182.
This commit is contained in:
Andreas Kling 2020-08-17 09:55:40 +02:00
parent 22f701d657
commit d5d54da0ea
1 changed files with 1 additions and 2 deletions
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3
Kernel/PerformanceEventBuffer.cpp
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@ -66,9 +66,8 @@ KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
FlatPtr ebp; FlatPtr ebp;
asm volatile("movl %%ebp, %%eax" asm volatile("movl %%ebp, %%eax"
: "=a"(ebp)); : "=a"(ebp));
FlatPtr eip;
auto current_thread = Thread::current(); auto current_thread = Thread::current();
copy_from_user(&eip, (FlatPtr*)&current_thread->get_register_dump_from_stack().eip); auto eip = current_thread->get_register_dump_from_stack().eip;
Vector<FlatPtr> backtrace; Vector<FlatPtr> backtrace;
{ {
SmapDisabler disabler; SmapDisabler disabler;