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firefox/toolkit/crashreporter/breakpad-patches/14-handle-non-fixed-size-amd64-and-x86-contexts.patch
Daniel Baumann 5e9a113729
Adding upstream version 140.0. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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diff --git a/src/processor/minidump.cc b/src/processor/minidump.cc
index 1f479558..aa63fe47 100644
--- a/src/processor/minidump.cc
+++ b/src/processor/minidump.cc
@@ -444,140 +444,30 @@ MinidumpContext::MinidumpContext(Minidump* minidump)
MinidumpContext::~MinidumpContext() {
}
bool MinidumpContext::Read(uint32_t expected_size) {
valid_ = false;
// Certain raw context types are currently assumed to have unique sizes.
- if (!IsContextSizeUnique(sizeof(MDRawContextAMD64))) {
- BPLOG(ERROR) << "sizeof(MDRawContextAMD64) cannot match the size of any "
- << "other raw context";
- return false;
- }
if (!IsContextSizeUnique(sizeof(MDRawContextPPC64))) {
BPLOG(ERROR) << "sizeof(MDRawContextPPC64) cannot match the size of any "
<< "other raw context";
return false;
}
if (!IsContextSizeUnique(sizeof(MDRawContextARM64_Old))) {
BPLOG(ERROR) << "sizeof(MDRawContextARM64_Old) cannot match the size of any "
<< "other raw context";
return false;
}
FreeContext();
- // First, figure out what type of CPU this context structure is for.
- // For some reason, the AMD64 Context doesn't have context_flags
- // at the beginning of the structure, so special case it here.
- if (expected_size == sizeof(MDRawContextAMD64)) {
- BPLOG(INFO) << "MinidumpContext: looks like AMD64 context";
-
- scoped_ptr<MDRawContextAMD64> context_amd64(new MDRawContextAMD64());
- if (!minidump_->ReadBytes(context_amd64.get(),
- sizeof(MDRawContextAMD64))) {
- BPLOG(ERROR) << "MinidumpContext could not read amd64 context";
- return false;
- }
-
- if (minidump_->swap())
- Swap(&context_amd64->context_flags);
-
- uint32_t cpu_type = context_amd64->context_flags & MD_CONTEXT_CPU_MASK;
- if (cpu_type == 0) {
- if (minidump_->GetContextCPUFlagsFromSystemInfo(&cpu_type)) {
- context_amd64->context_flags |= cpu_type;
- } else {
- BPLOG(ERROR) << "Failed to preserve the current stream position";
- return false;
- }
- }
-
- if (cpu_type != MD_CONTEXT_AMD64) {
- // TODO: Fall through to switch below.
- // https://bugs.chromium.org/p/google-breakpad/issues/detail?id=550
- BPLOG(ERROR) << "MinidumpContext not actually amd64 context";
- return false;
- }
-
- // Do this after reading the entire MDRawContext structure because
- // GetSystemInfo may seek minidump to a new position.
- if (!CheckAgainstSystemInfo(cpu_type)) {
- BPLOG(ERROR) << "MinidumpContext amd64 does not match system info";
- return false;
- }
-
- // Normalize the 128-bit types in the dump.
- // Since this is AMD64, by definition, the values are little-endian.
- for (unsigned int vr_index = 0;
- vr_index < MD_CONTEXT_AMD64_VR_COUNT;
- ++vr_index)
- Normalize128(&context_amd64->vector_register[vr_index], false);
-
- if (minidump_->swap()) {
- Swap(&context_amd64->p1_home);
- Swap(&context_amd64->p2_home);
- Swap(&context_amd64->p3_home);
- Swap(&context_amd64->p4_home);
- Swap(&context_amd64->p5_home);
- Swap(&context_amd64->p6_home);
- // context_flags is already swapped
- Swap(&context_amd64->mx_csr);
- Swap(&context_amd64->cs);
- Swap(&context_amd64->ds);
- Swap(&context_amd64->es);
- Swap(&context_amd64->fs);
- Swap(&context_amd64->ss);
- Swap(&context_amd64->eflags);
- Swap(&context_amd64->dr0);
- Swap(&context_amd64->dr1);
- Swap(&context_amd64->dr2);
- Swap(&context_amd64->dr3);
- Swap(&context_amd64->dr6);
- Swap(&context_amd64->dr7);
- Swap(&context_amd64->rax);
- Swap(&context_amd64->rcx);
- Swap(&context_amd64->rdx);
- Swap(&context_amd64->rbx);
- Swap(&context_amd64->rsp);
- Swap(&context_amd64->rbp);
- Swap(&context_amd64->rsi);
- Swap(&context_amd64->rdi);
- Swap(&context_amd64->r8);
- Swap(&context_amd64->r9);
- Swap(&context_amd64->r10);
- Swap(&context_amd64->r11);
- Swap(&context_amd64->r12);
- Swap(&context_amd64->r13);
- Swap(&context_amd64->r14);
- Swap(&context_amd64->r15);
- Swap(&context_amd64->rip);
- // FIXME: I'm not sure what actually determines
- // which member of the union {flt_save, sse_registers}
- // is valid. We're not currently using either,
- // but it would be good to have them swapped properly.
-
- for (unsigned int vr_index = 0;
- vr_index < MD_CONTEXT_AMD64_VR_COUNT;
- ++vr_index)
- Swap(&context_amd64->vector_register[vr_index]);
- Swap(&context_amd64->vector_control);
- Swap(&context_amd64->debug_control);
- Swap(&context_amd64->last_branch_to_rip);
- Swap(&context_amd64->last_branch_from_rip);
- Swap(&context_amd64->last_exception_to_rip);
- Swap(&context_amd64->last_exception_from_rip);
- }
-
- SetContextFlags(context_amd64->context_flags);
-
- SetContextAMD64(context_amd64.release());
- } else if (expected_size == sizeof(MDRawContextPPC64)) {
+ if (expected_size == sizeof(MDRawContextPPC64)) {
// |context_flags| of MDRawContextPPC64 is 64 bits, but other MDRawContext
// in the else case have 32 bits |context_flags|, so special case it here.
uint64_t context_flags;
if (!minidump_->ReadBytes(&context_flags, sizeof(context_flags))) {
BPLOG(ERROR) << "MinidumpContext could not read context flags";
return false;
}
if (minidump_->swap())
@@ -739,56 +629,152 @@ bool MinidumpContext::Read(uint32_t expected_size) {
}
}
scoped_ptr<MDRawContextARM64> new_context(new MDRawContextARM64());
ConvertOldARM64Context(*context_arm64.get(), new_context.get());
SetContextFlags(new_context->context_flags);
SetContextARM64(new_context.release());
} else {
- uint32_t context_flags;
- if (!minidump_->ReadBytes(&context_flags, sizeof(context_flags))) {
- BPLOG(ERROR) << "MinidumpContext could not read context flags";
+ uint32_t cpu_type = 0;
+ if (!minidump_->GetContextCPUFlagsFromSystemInfo(&cpu_type)) {
+ BPLOG(ERROR) << "Failed to preserve the current stream position";
return false;
}
- if (minidump_->swap())
- Swap(&context_flags);
- uint32_t cpu_type = context_flags & MD_CONTEXT_CPU_MASK;
- if (cpu_type == 0) {
- // Unfortunately the flag for MD_CONTEXT_ARM that was taken
- // from a Windows CE SDK header conflicts in practice with
- // the CONTEXT_XSTATE flag. MD_CONTEXT_ARM has been renumbered,
- // but handle dumps with the legacy value gracefully here.
- if (context_flags & MD_CONTEXT_ARM_OLD) {
- context_flags |= MD_CONTEXT_ARM;
- context_flags &= ~MD_CONTEXT_ARM_OLD;
- cpu_type = MD_CONTEXT_ARM;
+ uint32_t context_flags = 0;
+ if ((cpu_type == 0) || cpu_type != MD_CONTEXT_AMD64) {
+ if (!minidump_->ReadBytes(&context_flags, sizeof(context_flags))) {
+ BPLOG(ERROR) << "MinidumpContext could not read context flags";
+ return false;
}
- }
- if (cpu_type == 0) {
- if (minidump_->GetContextCPUFlagsFromSystemInfo(&cpu_type)) {
- context_flags |= cpu_type;
+ if (minidump_->swap())
+ Swap(&context_flags);
+
+ if ((context_flags & MD_CONTEXT_CPU_MASK) == 0) {
+ // Unfortunately the flag for MD_CONTEXT_ARM that was taken
+ // from a Windows CE SDK header conflicts in practice with
+ // the CONTEXT_XSTATE flag. MD_CONTEXT_ARM has been renumbered,
+ // but handle dumps with the legacy value gracefully here.
+ if (context_flags & MD_CONTEXT_ARM_OLD) {
+ context_flags |= MD_CONTEXT_ARM;
+ context_flags &= ~MD_CONTEXT_ARM_OLD;
+ cpu_type = MD_CONTEXT_ARM;
+ } else {
+ context_flags |= cpu_type;
+ }
} else {
- BPLOG(ERROR) << "Failed to preserve the current stream position";
- return false;
+ cpu_type = context_flags & MD_CONTEXT_CPU_MASK;
}
}
// Allocate the context structure for the correct CPU and fill it. The
// casts are slightly unorthodox, but it seems better to do that than to
// maintain a separate pointer for each type of CPU context structure
// when only one of them will be used.
switch (cpu_type) {
+ case MD_CONTEXT_AMD64: {
+ if (expected_size != sizeof(MDRawContextAMD64)) {
+ BPLOG(INFO) << "MinidumpContext AMD64 size mismatch, " <<
+ expected_size << " != " << sizeof(MDRawContextAMD64);
+ }
+ BPLOG(INFO) << "MinidumpContext: looks like AMD64 context";
+
+ scoped_ptr<MDRawContextAMD64> context_amd64(new MDRawContextAMD64());
+ if (!minidump_->ReadBytes(context_amd64.get(),
+ sizeof(MDRawContextAMD64))) {
+ BPLOG(ERROR) << "MinidumpContext could not read amd64 context";
+ return false;
+ }
+
+ if (minidump_->swap())
+ Swap(&context_amd64->context_flags);
+
+ // Update context_flags since we haven't done it yet
+ context_flags = context_amd64->context_flags;
+
+ if (cpu_type != (context_flags & MD_CONTEXT_CPU_MASK)) {
+ BPLOG(ERROR) << "MinidumpContext amd64 does not match system info";
+ return false;
+ }
+
+ // Normalize the 128-bit types in the dump.
+ // Since this is AMD64, by definition, the values are little-endian.
+ for (unsigned int vr_index = 0;
+ vr_index < MD_CONTEXT_AMD64_VR_COUNT;
+ ++vr_index)
+ Normalize128(&context_amd64->vector_register[vr_index], false);
+
+ if (minidump_->swap()) {
+ Swap(&context_amd64->p1_home);
+ Swap(&context_amd64->p2_home);
+ Swap(&context_amd64->p3_home);
+ Swap(&context_amd64->p4_home);
+ Swap(&context_amd64->p5_home);
+ Swap(&context_amd64->p6_home);
+ // context_flags is already swapped
+ Swap(&context_amd64->mx_csr);
+ Swap(&context_amd64->cs);
+ Swap(&context_amd64->ds);
+ Swap(&context_amd64->es);
+ Swap(&context_amd64->fs);
+ Swap(&context_amd64->ss);
+ Swap(&context_amd64->eflags);
+ Swap(&context_amd64->dr0);
+ Swap(&context_amd64->dr1);
+ Swap(&context_amd64->dr2);
+ Swap(&context_amd64->dr3);
+ Swap(&context_amd64->dr6);
+ Swap(&context_amd64->dr7);
+ Swap(&context_amd64->rax);
+ Swap(&context_amd64->rcx);
+ Swap(&context_amd64->rdx);
+ Swap(&context_amd64->rbx);
+ Swap(&context_amd64->rsp);
+ Swap(&context_amd64->rbp);
+ Swap(&context_amd64->rsi);
+ Swap(&context_amd64->rdi);
+ Swap(&context_amd64->r8);
+ Swap(&context_amd64->r9);
+ Swap(&context_amd64->r10);
+ Swap(&context_amd64->r11);
+ Swap(&context_amd64->r12);
+ Swap(&context_amd64->r13);
+ Swap(&context_amd64->r14);
+ Swap(&context_amd64->r15);
+ Swap(&context_amd64->rip);
+ // FIXME: I'm not sure what actually determines
+ // which member of the union {flt_save, sse_registers}
+ // is valid. We're not currently using either,
+ // but it would be good to have them swapped properly.
+
+ for (unsigned int vr_index = 0;
+ vr_index < MD_CONTEXT_AMD64_VR_COUNT;
+ ++vr_index)
+ Swap(&context_amd64->vector_register[vr_index]);
+ Swap(&context_amd64->vector_control);
+ Swap(&context_amd64->debug_control);
+ Swap(&context_amd64->last_branch_to_rip);
+ Swap(&context_amd64->last_branch_from_rip);
+ Swap(&context_amd64->last_exception_to_rip);
+ Swap(&context_amd64->last_exception_from_rip);
+ }
+
+ SetContextFlags(context_amd64->context_flags);
+
+ SetContextAMD64(context_amd64.release());
+ minidump_->SeekSet(
+ (minidump_->Tell() - sizeof(MDRawContextAMD64)) + expected_size);
+ break;
+ }
case MD_CONTEXT_X86: {
if (expected_size != sizeof(MDRawContextX86)) {
- BPLOG(ERROR) << "MinidumpContext x86 size mismatch, " <<
+ BPLOG(INFO) << "MinidumpContext x86 size mismatch, " <<
expected_size << " != " << sizeof(MDRawContextX86);
- return false;
}
scoped_ptr<MDRawContextX86> context_x86(new MDRawContextX86());
// Set the context_flags member, which has already been read, and
// read the rest of the structure beginning with the first member
// after context_flags.
context_x86->context_flags = context_flags;
@@ -843,16 +829,18 @@ bool MinidumpContext::Read(uint32_t expected_size) {
Swap(&context_x86->eflags);
Swap(&context_x86->esp);
Swap(&context_x86->ss);
// context_x86->extended_registers[] contains 8-bit quantities and
// does not need to be swapped.
}
SetContextX86(context_x86.release());
+ minidump_->SeekSet(
+ (minidump_->Tell() - sizeof(MDRawContextX86)) + expected_size);
break;
}
case MD_CONTEXT_PPC: {
if (expected_size != sizeof(MDRawContextPPC)) {
BPLOG(ERROR) << "MinidumpContext ppc size mismatch, " <<
expected_size << " != " << sizeof(MDRawContextPPC);
--
2.26.2
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