DavidSpickett updated this revision to Diff 345106.
DavidSpickett added a comment.
Address comments in general.
Added an assert in the loop where we call ptrace
so that we catch any unexpected condition that would
make it an infinite loop.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D95601/new/
https://reviews.llvm.org/D95601
Files:
lldb/include/lldb/Host/common/NativeProcessProtocol.h
lldb/include/lldb/Host/linux/Ptrace.h
lldb/include/lldb/Utility/StringExtractorGDBRemote.h
lldb/source/Host/common/NativeProcessProtocol.cpp
lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
lldb/source/Plugins/Process/Linux/NativeProcessLinux.h
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
lldb/source/Utility/StringExtractorGDBRemote.cpp
lldb/test/API/tools/lldb-server/memory-tagging/Makefile
lldb/test/API/tools/lldb-server/memory-tagging/TestGdbRemoteMemoryTagging.py
lldb/test/API/tools/lldb-server/memory-tagging/main.c
Index: lldb/test/API/tools/lldb-server/memory-tagging/main.c
===================================================================
--- /dev/null
+++ lldb/test/API/tools/lldb-server/memory-tagging/main.c
@@ -0,0 +1,55 @@
+#include <arm_acle.h>
+#include <asm/hwcap.h>
+#include <linux/mman.h>
+#include <stdio.h>
+#include <sys/auxv.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+
+int print_result(char *ptr) {
+ // Page size allows the test to try reading off of the end of the page
+ printf("buffer: %p page_size: 0x%x\n", ptr, sysconf(_SC_PAGESIZE));
+
+ // Exit after some time, so we don't leave a zombie process
+ // if the test framework lost track of us.
+ sleep(60);
+ return 0;
+}
+
+int main(int argc, char const *argv[]) {
+ if (prctl(PR_SET_TAGGED_ADDR_CTRL,
+ PR_TAGGED_ADDR_ENABLE | PR_MTE_TCF_SYNC |
+ // Allow all tags to be generated by the addg
+ // instruction __arm_mte_increment_tag produces.
+ (0xffff << PR_MTE_TAG_SHIFT),
+ 0, 0, 0)) {
+ return print_result(NULL);
+ }
+
+ size_t page_size = sysconf(_SC_PAGESIZE);
+ char *buf = mmap(0, page_size, PROT_READ | PROT_WRITE | PROT_MTE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (buf == MAP_FAILED)
+ return print_result(NULL);
+
+ // Set incrementing tags until end of the page
+ char *tagged_ptr = buf;
+ // This intrinsic treats the addresses as if they were untagged
+ while (__arm_mte_ptrdiff(tagged_ptr, buf) < page_size) {
+ // This sets the allocation tag
+ __arm_mte_set_tag(tagged_ptr);
+ // Set the tag of the next granule (hence +16) to the next
+ // tag value. Returns a new pointer with the new logical tag.
+ // Tag values wrap at 0xF so it'll cycle.
+ tagged_ptr = __arm_mte_increment_tag(tagged_ptr + 16, 1);
+ }
+
+ // lldb-server should be removing the top byte from addresses passed
+ // to ptrace. So put some random bits in there.
+ // ptrace expects you to remove them but it can still succeed if you
+ // don't. So this isn't proof that we're removing them, it's just a
+ // smoke test in case something didn't account for them.
+ buf = (char *)((size_t)buf | ((size_t)0xAA << 56));
+ return print_result(buf);
+}
Index: lldb/test/API/tools/lldb-server/memory-tagging/TestGdbRemoteMemoryTagging.py
===================================================================
--- /dev/null
+++ lldb/test/API/tools/lldb-server/memory-tagging/TestGdbRemoteMemoryTagging.py
@@ -0,0 +1,116 @@
+import gdbremote_testcase
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+class TestGdbRemoteMemoryTagging(gdbremote_testcase.GdbRemoteTestCaseBase):
+
+ mydir = TestBase.compute_mydir(__file__)
+
+ def check_qmemtags_response(self, body, expected):
+ self.test_sequence.add_log_lines(["read packet: $qMemTags:{}#00".format(body),
+ "send packet: ${}#00".format(expected),
+ ],
+ True)
+ self.expect_gdbremote_sequence()
+
+ @skipUnlessArch("aarch64")
+ @skipUnlessPlatform(["linux"])
+ @skipUnlessAArch64MTELinuxCompiler
+ def test_qmemtags_packets(self):
+ """ Test that qMemTags packets are parsed correctly and/or rejected. """
+
+ self.build()
+ self.set_inferior_startup_launch()
+ procs = self.prep_debug_monitor_and_inferior()
+
+ # Run the process
+ self.test_sequence.add_log_lines(
+ [
+ # Start running after initial stop
+ "read packet: $c#63",
+ # Match the address of the MTE page
+ {"type": "output_match",
+ "regex": self.maybe_strict_output_regex(r"buffer: (.+) page_size: (.+)\r\n"),
+ "capture": {1: "buffer", 2: "page_size"}},
+ # Now stop the inferior
+ "read packet: {}".format(chr(3)),
+ # And wait for the stop notification
+ {"direction": "send", "regex": r"^\$T[0-9a-fA-F]{2}thread:[0-9a-fA-F]+;"}],
+ True)
+
+ # Run the packet stream
+ context = self.expect_gdbremote_sequence()
+ self.assertIsNotNone(context)
+
+ buf_address = context.get("buffer")
+ self.assertIsNotNone(buf_address)
+ page_size = context.get("page_size")
+ self.assertIsNotNone(page_size)
+
+ # nil means we couldn't set up a tagged page because the
+ # target doesn't support it.
+ if buf_address == "(nil)":
+ self.skipTest("Target must support MTE.")
+
+ buf_address = int(buf_address, 16)
+ page_size = int(page_size, 16)
+
+ # In the tests below E03 means the packet wasn't formed correctly
+ # and E01 means it was but we had some other error acting upon it.
+
+ # Sanity check that address is correct
+ self.check_qmemtags_response("{:x},20:1".format(buf_address), "m0001")
+
+ # Invalid packets
+
+ # No content
+ self.check_qmemtags_response("", "E03")
+ # Only address
+ self.check_qmemtags_response("{:x}".format(buf_address), "E03")
+ # Only address and length
+ self.check_qmemtags_response("{:x},20".format(buf_address), "E03")
+ # Empty address
+ self.check_qmemtags_response(",20:1", "E03")
+ # Invalid addresses
+ self.check_qmemtags_response("aardvark,20:1", "E03")
+ self.check_qmemtags_response("-100,20:1", "E03")
+ self.check_qmemtags_response("cafe?,20:1", "E03")
+ # Empty length
+ self.check_qmemtags_response("{:x},:1".format(buf_address), "E03")
+ # Invalid lengths
+ self.check_qmemtags_response("{:x},food:1".format(buf_address), "E03")
+ self.check_qmemtags_response("{:x},-1:1".format(buf_address), "E03")
+ self.check_qmemtags_response("{:x},12??:1".format(buf_address), "E03")
+ # Empty type
+ self.check_qmemtags_response("{:x},10:".format(buf_address), "E03")
+ # Types we don't support
+ self.check_qmemtags_response("{:x},10:FF".format(buf_address), "E01")
+ # (even if the length of the read is zero)
+ self.check_qmemtags_response("{:x},0:FF".format(buf_address), "E01")
+ self.check_qmemtags_response("{:x},10:-1".format(buf_address), "E01")
+ self.check_qmemtags_response("{:x},10:+20".format(buf_address), "E01")
+ # Invalid type format
+ self.check_qmemtags_response("{:x},10:cat".format(buf_address), "E03")
+ self.check_qmemtags_response("{:x},10:?11".format(buf_address), "E03")
+
+ # Valid packets
+
+ # Reading nothing is allowed
+ self.check_qmemtags_response("{:x},0:1".format(buf_address), "m")
+ # A range that's already aligned
+ self.check_qmemtags_response("{:x},20:1".format(buf_address), "m0001")
+ # lldb-server should re-align the range
+ # Here we read from 1/2 way through a granule, into the next. Expands to 2 granules
+ self.check_qmemtags_response("{:x},10:1".format(buf_address+64-8), "m0304")
+ # Read up to the end of an MTE page.
+ # We know that the last tag should be 0xF since page size will always be a
+ # multiple of 256 bytes, which is 16 granules and we have 16 tags to use.
+ self.check_qmemtags_response("{:x},10:1".format(buf_address+page_size-16), "m0f")
+ # Here we read off of the end of the MTE range so ptrace gives us one tag,
+ # then fails on the second call. To lldb-server this means the response
+ # should just be an error, not a partial read.
+ self.check_qmemtags_response("{:x},20:1".format(buf_address+page_size-16), "E01")
+ # Note that we do not test reading over a page boundary within the same
+ # mapping. That logic is handled in the kernel itself so it's just a single
+ # ptrace call for lldb-server.
Index: lldb/test/API/tools/lldb-server/memory-tagging/Makefile
===================================================================
--- /dev/null
+++ lldb/test/API/tools/lldb-server/memory-tagging/Makefile
@@ -0,0 +1,4 @@
+C_SOURCES := main.c
+CFLAGS_EXTRAS := -march=armv8.5-a+memtag
+
+include Makefile.rules
Index: lldb/source/Utility/StringExtractorGDBRemote.cpp
===================================================================
--- lldb/source/Utility/StringExtractorGDBRemote.cpp
+++ lldb/source/Utility/StringExtractorGDBRemote.cpp
@@ -223,6 +223,8 @@
return eServerPacketType_qMemoryRegionInfoSupported;
if (PACKET_STARTS_WITH("qModuleInfo:"))
return eServerPacketType_qModuleInfo;
+ if (PACKET_STARTS_WITH("qMemTags:"))
+ return eServerPacketType_qMemTags;
break;
case 'P':
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
@@ -216,6 +216,8 @@
PacketResult Handle_g(StringExtractorGDBRemote &packet);
+ PacketResult Handle_qMemTags(StringExtractorGDBRemote &packet);
+
void SetCurrentThreadID(lldb::tid_t tid);
lldb::tid_t GetCurrentThreadID() const;
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -13,6 +13,7 @@
#include <chrono>
#include <cstring>
+#include <limits>
#include <thread>
#include "GDBRemoteCommunicationServerLLGS.h"
@@ -211,6 +212,10 @@
RegisterMemberFunctionHandler(StringExtractorGDBRemote::eServerPacketType_g,
&GDBRemoteCommunicationServerLLGS::Handle_g);
+ RegisterMemberFunctionHandler(
+ StringExtractorGDBRemote::eServerPacketType_qMemTags,
+ &GDBRemoteCommunicationServerLLGS::Handle_qMemTags);
+
RegisterPacketHandler(StringExtractorGDBRemote::eServerPacketType_k,
[this](StringExtractorGDBRemote packet, Status &error,
bool &interrupt, bool &quit) {
@@ -3414,6 +3419,71 @@
return SendOKResponse();
}
+GDBRemoteCommunication::PacketResult
+GDBRemoteCommunicationServerLLGS::Handle_qMemTags(
+ StringExtractorGDBRemote &packet) {
+ Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+ // Ensure we have a process.
+ if (!m_current_process ||
+ (m_current_process->GetID() == LLDB_INVALID_PROCESS_ID)) {
+ LLDB_LOGF(
+ log,
+ "GDBRemoteCommunicationServerLLGS::%s failed, no process available",
+ __FUNCTION__);
+ return SendErrorResponse(1);
+ }
+
+ // We are expecting
+ // qMemTags:<hex address>,<hex length>:<hex type>
+
+ // Address
+ packet.SetFilePos(strlen("qMemTags:"));
+ const char *current_char = packet.Peek();
+ if (!current_char || *current_char == ',')
+ return SendIllFormedResponse(packet, "Missing address in qMemTags packet");
+ const lldb::addr_t addr = packet.GetHexMaxU64(/*little_endian=*/false, 0);
+
+ // Length
+ char previous_char = packet.GetChar();
+ current_char = packet.Peek();
+ // If we don't have a separator or the length field is empty
+ if (previous_char != ',' || (current_char && *current_char == ':'))
+ return SendIllFormedResponse(packet,
+ "Invalid addr,length pair in qMemTags packet");
+
+ if (packet.GetBytesLeft() < 1)
+ return SendIllFormedResponse(
+ packet, "Too short qMemtags: packet (looking for length)");
+ const size_t length = packet.GetHexMaxU64(/*little_endian=*/false, 0);
+
+ // Type
+ const char *invalid_type_err = "Invalid type field in qMemTags: packet";
+ if (packet.GetBytesLeft() < 1 || packet.GetChar() != ':')
+ return SendIllFormedResponse(packet, invalid_type_err);
+
+ int32_t type =
+ packet.GetS32(std::numeric_limits<int32_t>::max(), /*base=*/16);
+ if (type == std::numeric_limits<int32_t>::max() ||
+ // To catch inputs like "123aardvark" that will parse but clearly aren't
+ // valid in this case.
+ packet.GetBytesLeft()) {
+ return SendIllFormedResponse(packet, invalid_type_err);
+ }
+
+ StreamGDBRemote response;
+ std::vector<uint8_t> tags;
+ Status error = m_current_process->ReadMemoryTags(type, addr, length, tags);
+ if (error.Fail())
+ return SendErrorResponse(1);
+
+ // This m is here in case we want to support multi part replies in the future.
+ // In the same manner as qfThreadInfo/qsThreadInfo.
+ response.PutChar('m');
+ response.PutBytesAsRawHex8(tags.data(), tags.size());
+ return SendPacketNoLock(response.GetString());
+}
+
void GDBRemoteCommunicationServerLLGS::MaybeCloseInferiorTerminalConnection() {
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
@@ -53,6 +53,9 @@
bool RegisterOffsetIsDynamic() const override { return true; }
+ llvm::Expected<MemoryTaggingDetails>
+ GetMemoryTaggingDetails(int32_t type) override;
+
protected:
Status ReadGPR() override;
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
@@ -21,6 +21,7 @@
#include "Plugins/Process/Linux/NativeProcessLinux.h"
#include "Plugins/Process/Linux/Procfs.h"
#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
+#include "Plugins/Process/Utility/MemoryTagManagerAArch64MTE.h"
#include "Plugins/Process/Utility/RegisterInfoPOSIX_arm64.h"
// System includes - They have to be included after framework includes because
@@ -877,4 +878,15 @@
return expedited_reg_nums;
}
+llvm::Expected<NativeRegisterContextLinux::MemoryTaggingDetails>
+NativeRegisterContextLinux_arm64::GetMemoryTaggingDetails(int32_t type) {
+ if (type == MemoryTagManagerAArch64MTE::eMTE_allocation) {
+ return MemoryTaggingDetails{std::make_unique<MemoryTagManagerAArch64MTE>(),
+ PTRACE_PEEKMTETAGS, PTRACE_POKEMTETAGS};
+ }
+
+ return llvm::createStringError(llvm::inconvertibleErrorCode(),
+ "Unknown AArch64 memory tag type %d", type);
+}
+
#endif // defined (__arm64__) || defined (__aarch64__)
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
@@ -11,6 +11,8 @@
#include "Plugins/Process/Utility/NativeRegisterContextRegisterInfo.h"
#include "lldb/Host/common/NativeThreadProtocol.h"
+#include "lldb/Target/MemoryTagManager.h"
+#include "llvm/Support/Error.h"
namespace lldb_private {
namespace process_linux {
@@ -57,6 +59,22 @@
/// they are supported.
virtual llvm::Optional<MmapData> GetMmapData() { return llvm::None; }
+ struct MemoryTaggingDetails {
+ /// Object with tag handling utilities. If the function below returns
+ /// a valid structure, you can assume that this pointer is valid.
+ std::unique_ptr<MemoryTagManager> manager;
+ int ptrace_read_req; /// ptrace operation number for memory tag read
+ int ptrace_write_req; /// ptrace operation number for memory tag write
+ };
+ /// Return architecture specific data needed to use memory tags,
+ /// if they are supported.
+ virtual llvm::Expected<MemoryTaggingDetails>
+ GetMemoryTaggingDetails(int32_t type) {
+ return llvm::createStringError(
+ llvm::inconvertibleErrorCode(),
+ "Architecture does not support memory tagging");
+ }
+
protected:
// NB: This constructor is here only because gcc<=6.5 requires a virtual base
// class initializer on abstract class (even though it is never used). It can
Index: lldb/source/Plugins/Process/Linux/NativeProcessLinux.h
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeProcessLinux.h
+++ lldb/source/Plugins/Process/Linux/NativeProcessLinux.h
@@ -80,6 +80,9 @@
llvm::Error DeallocateMemory(lldb::addr_t addr) override;
+ Status ReadMemoryTags(int32_t type, lldb::addr_t addr, size_t len,
+ std::vector<uint8_t> &tags) override;
+
size_t UpdateThreads() override;
const ArchSpec &GetArchitecture() const override { return m_arch; }
Index: lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
+++ lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
@@ -1431,6 +1431,61 @@
return llvm::Error::success();
}
+Status NativeProcessLinux::ReadMemoryTags(int32_t type, lldb::addr_t addr,
+ size_t len,
+ std::vector<uint8_t> &tags) {
+ llvm::Expected<NativeRegisterContextLinux::MemoryTaggingDetails> details =
+ GetCurrentThread()->GetRegisterContext().GetMemoryTaggingDetails(type);
+ if (!details)
+ return Status(details.takeError());
+
+ // Ignore 0 length read
+ if (!len)
+ return Status();
+
+ // lldb will align the range it requests but it is not required to by
+ // the protocol so we'll do it again just in case.
+ // Remove non address bits too. Ptrace calls may work regardless but that
+ // is not a guarantee.
+ MemoryTagManager::TagRange range(details->manager->RemoveNonAddressBits(addr),
+ len);
+ range = details->manager->ExpandToGranule(range);
+
+ // Allocate enough space for all tags to be read
+ size_t num_tags = range.GetByteSize() / details->manager->GetGranuleSize();
+ tags.resize(num_tags * details->manager->GetTagSizeInBytes());
+
+ struct iovec tags_iovec;
+ uint8_t *dest = tags.data();
+ lldb::addr_t read_addr = range.GetRangeBase();
+
+ // This call can return partial data so loop until we error or
+ // get all tags back.
+ while (num_tags) {
+ tags_iovec.iov_base = dest;
+ tags_iovec.iov_len = num_tags;
+
+ Status error = NativeProcessLinux::PtraceWrapper(
+ details->ptrace_read_req, GetID(), reinterpret_cast<void *>(read_addr),
+ static_cast<void *>(&tags_iovec), 0, nullptr);
+
+ if (error.Fail()) {
+ // Discard partial reads
+ tags.resize(0);
+ return error;
+ }
+
+ size_t tags_read = tags_iovec.iov_len;
+ assert(tags_read && (tags_read <= num_tags));
+
+ dest += tags_read * details->manager->GetTagSizeInBytes();
+ read_addr += details->manager->GetGranuleSize() * tags_read;
+ num_tags -= tags_read;
+ }
+
+ return Status();
+}
+
size_t NativeProcessLinux::UpdateThreads() {
// The NativeProcessLinux monitoring threads are always up to date with
// respect to thread state and they keep the thread list populated properly.
Index: lldb/source/Host/common/NativeProcessProtocol.cpp
===================================================================
--- lldb/source/Host/common/NativeProcessProtocol.cpp
+++ lldb/source/Host/common/NativeProcessProtocol.cpp
@@ -52,6 +52,12 @@
return Status("not implemented");
}
+lldb_private::Status
+NativeProcessProtocol::ReadMemoryTags(int32_t type, lldb::addr_t addr,
+ size_t len, std::vector<uint8_t> &tags) {
+ return Status("not implemented");
+}
+
llvm::Optional<WaitStatus> NativeProcessProtocol::GetExitStatus() {
if (m_state == lldb::eStateExited)
return m_exit_status;
Index: lldb/include/lldb/Utility/StringExtractorGDBRemote.h
===================================================================
--- lldb/include/lldb/Utility/StringExtractorGDBRemote.h
+++ lldb/include/lldb/Utility/StringExtractorGDBRemote.h
@@ -167,6 +167,8 @@
eServerPacketType_jLLDBTraceStop,
eServerPacketType_jLLDBTraceGetState,
eServerPacketType_jLLDBTraceGetBinaryData,
+
+ eServerPacketType_qMemTags,
};
ServerPacketType GetServerPacketType() const;
Index: lldb/include/lldb/Host/linux/Ptrace.h
===================================================================
--- lldb/include/lldb/Host/linux/Ptrace.h
+++ lldb/include/lldb/Host/linux/Ptrace.h
@@ -50,6 +50,12 @@
#define ARCH_GET_FS 0x1003
#define ARCH_GET_GS 0x1004
#endif
+#ifndef PTRACE_PEEKMTETAGS
+#define PTRACE_PEEKMTETAGS 33
+#endif
+#ifndef PTRACE_POKEMTETAGS
+#define PTRACE_POKEMTETAGS 34
+#endif
#define LLDB_PTRACE_NT_ARM_TLS 0x401 // ARM TLS register
Index: lldb/include/lldb/Host/common/NativeProcessProtocol.h
===================================================================
--- lldb/include/lldb/Host/common/NativeProcessProtocol.h
+++ lldb/include/lldb/Host/common/NativeProcessProtocol.h
@@ -87,6 +87,9 @@
Status ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t size,
size_t &bytes_read);
+ virtual Status ReadMemoryTags(int32_t type, lldb::addr_t addr, size_t len,
+ std::vector<uint8_t> &tags);
+
/// Reads a null terminated string from memory.
///
/// Reads up to \p max_size bytes of memory until it finds a '\0'.
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