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Issue in StackwalkerAMD64::GetCallerByFramePointerRecovery.

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There is an issue in StackwalkerAMD64::GetCallerByFramePointerRecovery.
Occasionally it produces invalid frames (instruction pointer == 0) which
prevents the AMD64 stack walker from proceeding to do stack scanning and
instead leads to premature termination of the stack walking process.

For more details: http://crbug/537444

BUG=
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1408973002 .
This commit is contained in:
Ivan Penkov 2015-10-15 20:47:15 -07:00
parent ef7575d35a
commit b458f36762
3 changed files with 165 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/processor/stackwalker_amd64.cc
View File

@ -147,6 +147,23 @@ StackFrameAMD64* StackwalkerAMD64::GetCallerByCFIFrameInfo(
return frame.release();
}
bool StackwalkerAMD64::IsEndOfStack(uint64_t caller_rip, uint64_t caller_rsp,
uint64_t callee_rsp) {
// Treat an instruction address of 0 as end-of-stack.
if (caller_rip == 0) {
return true;
}
// If the new stack pointer is at a lower address than the old, then
// that's clearly incorrect. Treat this as end-of-stack to enforce
// progress and avoid infinite loops.
if (caller_rsp < callee_rsp) {
return true;
}
return false;
}
StackFrameAMD64* StackwalkerAMD64::GetCallerByFramePointerRecovery(
const vector<StackFrame*>& frames) {
StackFrameAMD64* last_frame = static_cast<StackFrameAMD64*>(frames.back());
@ -175,8 +192,11 @@ StackFrameAMD64* StackwalkerAMD64::GetCallerByFramePointerRecovery(
uint64_t caller_rsp = last_rbp + 16;
// Simple sanity check that the stack is growing downwards as expected.
if (caller_rbp < last_rbp || caller_rsp < last_rsp)
if (IsEndOfStack(caller_rip, caller_rsp, last_rsp) ||
caller_rbp < last_rbp) {
// Reached end-of-stack or stack is not growing downwards.
return NULL;
}
StackFrameAMD64* frame = new StackFrameAMD64();
frame->trust = StackFrame::FRAME_TRUST_FP;
@ -284,15 +304,11 @@ StackFrame* StackwalkerAMD64::GetCallerFrame(const CallStack* stack,
new_frame->context.rbp = static_cast<uint32_t>(new_frame->context.rbp);
}
// Treat an instruction address of 0 as end-of-stack.
if (new_frame->context.rip == 0)
return NULL;
// If the new stack pointer is at a lower address than the old, then
// that's clearly incorrect. Treat this as end-of-stack to enforce
// progress and avoid infinite loops.
if (new_frame->context.rsp <= last_frame->context.rsp)
if (IsEndOfStack(new_frame->context.rip, new_frame->context.rsp,
last_frame->context.rsp)) {
// Reached end-of-stack.
return NULL;
}
// new_frame->context.rip is the return address, which is the instruction
// after the CALL that caused us to arrive at the callee. Set

8
src/processor/stackwalker_amd64.h
View File

@ -78,6 +78,14 @@ class StackwalkerAMD64 : public Stackwalker {
StackFrameAMD64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
CFIFrameInfo* cfi_frame_info);
// Checks whether end-of-stack is reached. An instruction address of 0 is an
// end-of-stack marker. If the stack pointer of the caller is at a lower
// address than the stack pointer of the callee, then that's clearly incorrect
// and it is treated as end-of-stack to enforce progress and avoid infinite
// loops.
bool IsEndOfStack(uint64_t caller_rip, uint64_t caller_rsp,
uint64_t callee_rsp);
// Assumes a traditional frame layout where the frame pointer has not been
// omitted. The expectation is that caller's %rbp is pushed to the stack
// after the return address of the callee, and that the callee's %rsp can

132
src/processor/stackwalker_amd64_unittest.cc
View File

@ -370,6 +370,138 @@ TEST_F(GetCallerFrame, ScanWithFunctionSymbols) {
EXPECT_EQ(0x50000000b0000100ULL, frame1->function_base);
}
// StackwalkerAMD64::GetCallerByFramePointerRecovery should never return an
// instruction pointer of 0 because IP of 0 is an end of stack marker and the
// stack walk may be terminated prematurely. Instead it should return NULL
// so that the stack walking code can proceed to stack scanning.
TEST_F(GetCallerFrame, GetCallerByFramePointerRecovery) {
MockCodeModule user32_dll(0x00007ff9cb8a0000ULL, 0x14E000, "user32.dll",
"version1");
SetModuleSymbols(&user32_dll, // user32.dll
"PUBLIC fa60 0 DispatchMessageWorker\n"
"PUBLIC fee0 0 UserCallWinProcCheckWow\n"
"PUBLIC 1cdb0 0 _fnHkINLPMSG\n"
"STACK CFI INIT fa60 340 .cfa: $rsp .ra: .cfa 8 - ^\n"
"STACK CFI fa60 .cfa: $rsp 128 +\n"
"STACK CFI INIT fee0 49f .cfa: $rsp .ra: .cfa 8 - ^\n"
"STACK CFI fee0 .cfa: $rsp 240 +\n"
"STACK CFI INIT 1cdb0 9f .cfa: $rsp .ra: .cfa 8 - ^\n"
"STACK CFI 1cdb0 .cfa: $rsp 80 +\n");
// Create some modules with some stock debugging information.
MockCodeModules local_modules;
local_modules.Add(&user32_dll);
Label frame0_rsp;
Label frame0_rbp;
Label frame1_rsp;
Label frame2_rsp;
stack_section.start() = 0x00000099abf0f238ULL;
stack_section
.Mark(&frame0_rsp)
.D64(0x00007ff9cb8b00dcULL)
.Mark(&frame1_rsp)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000001ULL)
.D64(0x00000099abf0f308ULL)
.D64(0x00007ff9cb8bce3aULL) // Stack residue from execution of
// user32!_fnHkINLPMSG+0x8a
.D64(0x000000000000c2e0ULL)
.D64(0x00000099abf0f328ULL)
.D64(0x0000000100000001ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x00007ff9ccad53e4ULL)
.D64(0x0000000000000048ULL)
.D64(0x0000000000000001ULL)
.D64(0x00000099abf0f5e0ULL)
.D64(0x00000099b61f7388ULL)
.D64(0x0000000000000030ULL)
.D64(0xffffff66540f0a1fULL)
.D64(0xffffff6649e08c77ULL)
.D64(0x00007ff9cb8affb4ULL) // Return address in
// user32!UserCallWinProcCheckWow+0xd4
.D64(0x0000000000000000ULL)
.D64(0x00000099abf0f368ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x0000000000000000ULL)
.D64(0x00000099a8150fd8ULL)
.D64(0x00000099abf0f3e8ULL)
.D64(0x00007ff9cb8afc07ULL) // Return address in
// user32!DispatchMessageWorker+0x1a7
.Mark(&frame2_rsp)
.Append(256, 0)
.Mark(&frame0_rbp) // The following are expected by
// GetCallerByFramePointerRecovery.
.D64(0xfffffffffffffffeULL) // %caller_rbp = *(%callee_rbp)
.D64(0x0000000000000000ULL) // %caller_rip = *(%callee_rbp + 8)
.D64(0x00000099a3e31040ULL) // %caller_rsp = *(%callee_rbp + 16)
.Append(256, 0);
RegionFromSection();
raw_context.rip = 0x00000099a8150fd8ULL; // IP in context frame is guarbage
raw_context.rsp = frame0_rsp.Value();
raw_context.rbp = frame0_rbp.Value();
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region,
&local_modules, &frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(0U, modules_without_symbols.size());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(3U, frames->size());
{ // To avoid reusing locals by mistake
StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame->trust);
ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame->context_validity);
EXPECT_EQ("", frame->function_name);
EXPECT_EQ(0x00000099a8150fd8ULL, frame->instruction);
EXPECT_EQ(0x00000099a8150fd8ULL, frame->context.rip);
EXPECT_EQ(frame0_rsp.Value(), frame->context.rsp);
EXPECT_EQ(frame0_rbp.Value(), frame->context.rbp);
}
{ // To avoid reusing locals by mistake
StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame->trust);
ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP |
StackFrameAMD64::CONTEXT_VALID_RSP |
StackFrameAMD64::CONTEXT_VALID_RBP),
frame->context_validity);
EXPECT_EQ("UserCallWinProcCheckWow", frame->function_name);
EXPECT_EQ(140710838468828ULL, frame->instruction + 1);
EXPECT_EQ(140710838468828ULL, frame->context.rip);
EXPECT_EQ(frame1_rsp.Value(), frame->context.rsp);
EXPECT_EQ(&user32_dll, frame->module);
}
{ // To avoid reusing locals by mistake
StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(2));
EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame->trust);
ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP |
StackFrameAMD64::CONTEXT_VALID_RSP |
StackFrameAMD64::CONTEXT_VALID_RBP),
frame->context_validity);
EXPECT_EQ("DispatchMessageWorker", frame->function_name);
EXPECT_EQ(140710838467591ULL, frame->instruction + 1);
EXPECT_EQ(140710838467591ULL, frame->context.rip);
EXPECT_EQ(frame2_rsp.Value(), frame->context.rsp);
EXPECT_EQ(&user32_dll, frame->module);
}
}
// Test that set_max_frames_scanned prevents using stack scanning
// to find caller frames.
TEST_F(GetCallerFrame, ScanningNotAllowed) {