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The ARM64 stack walker was doing an illegal down cast from base-class (StackFrame) to derived-class (StackFrameARM64).

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Inline frames are always of the base-class type (StackFrame). Treating them as derived-class and accessing members is causing buffer overflows.

Change-Id: Ib41b74256e6162e7d2b14ca3905dfaf5591b9c86
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/4847317
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Ivan Penkov 2023-09-06 11:21:48 -07:00 committed by Joshua Peraza
parent e35d1d09ae
commit f49c2f1a20
1 changed files with 20 additions and 9 deletions
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29
src/processor/stackwalker_arm64.cc
View file

@ -267,15 +267,25 @@ void StackwalkerARM64::CorrectRegLRByFramePointer(
last_frame->context.iregs[MD_CONTEXT_ARM64_REG_SP])
return;
StackFrameARM64* last_last_frame =
static_cast<StackFrameARM64*>(*(frames.end() - 2));
uint64_t last_last_fp =
last_last_frame->context.iregs[MD_CONTEXT_ARM64_REG_FP];
// Searching for a real callee frame. Skipping inline frames since they
// don't contain context (and cannot be downcasted to StackFrameARM64).
size_t last_frame_callee_id = frames.size() - 2;
while (last_frame_callee_id >= 0 && frames[last_frame_callee_id]->trust ==
StackFrame::FRAME_TRUST_INLINE) {
last_frame_callee_id--;
}
if (last_frame_callee_id < 0) return;
StackFrameARM64* last_frame_callee =
static_cast<StackFrameARM64*>(frames[last_frame_callee_id]);
uint64_t last_frame_callee_fp =
last_frame_callee->context.iregs[MD_CONTEXT_ARM64_REG_FP];
uint64_t last_fp = 0;
if (last_last_fp && !memory_->GetMemoryAtAddress(last_last_fp, &last_fp)) {
BPLOG(ERROR) << "Unable to read last_fp from last_last_fp: 0x"
<< std::hex << last_last_fp;
if (last_frame_callee_fp &&
!memory_->GetMemoryAtAddress(last_frame_callee_fp, &last_fp)) {
BPLOG(ERROR) << "Unable to read last_fp from last_last_fp: 0x" << std::hex
<< last_frame_callee_fp;
return;
}
// Give up if STACK CFI doesn't agree with frame pointer.
@ -283,9 +293,10 @@ void StackwalkerARM64::CorrectRegLRByFramePointer(
return;
uint64_t last_lr = 0;
if (last_last_fp && !memory_->GetMemoryAtAddress(last_last_fp + 8, &last_lr)) {
if (last_frame_callee_fp &&
!memory_->GetMemoryAtAddress(last_frame_callee_fp + 8, &last_lr)) {
BPLOG(ERROR) << "Unable to read last_lr from (last_last_fp + 8): 0x"
<< std::hex << (last_last_fp + 8);
<< std::hex << (last_frame_callee_fp + 8);
return;
}
last_lr = PtrauthStrip(last_lr);