6db44e52ce
A common reason for LLDB failing to attach to an already-running process on Linux is the Yama security module: https://www.kernel.org/doc/Documentation/security/Yama.txt. This patch adds an explaination and suggested fix when it detects that case happening. This was previously proposed in D106226, but hasn't been updated in a while. The last request was to put the check in a target-specific location, which is the approach this patch takes. I believe Yama only exists on Linux, so it's put in that package. This has no end-to-end test because I'm not sure how to set `ptrace_scope` in a test environment -- if there are suggestions on how to do that, I'd be happy to add it. (Also, setting it to `3` is comically irreversible). I tested this locally. Reviewed By: DavidSpickett, labath Differential Revision: https://reviews.llvm.org/D144904
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
//===-- Procfs.h ---------------------------------------------- -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/lldb-types.h"
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#include "llvm/Support/Error.h"
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#include <vector>
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namespace lldb_private {
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namespace process_linux {
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/// \return
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/// The content of /proc/cpuinfo and cache it if errors didn't happen.
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llvm::Expected<llvm::ArrayRef<uint8_t>> GetProcfsCpuInfo();
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/// \return
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/// A list of available logical core ids given the contents of
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/// /proc/cpuinfo.
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llvm::Expected<std::vector<lldb::cpu_id_t>>
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GetAvailableLogicalCoreIDs(llvm::StringRef cpuinfo);
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/// \return
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/// A list with all the logical cores available in the system and cache it
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/// if errors didn't happen.
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llvm::Expected<llvm::ArrayRef<lldb::cpu_id_t>> GetAvailableLogicalCoreIDs();
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/// \return
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/// The current value of /proc/sys/kernel/yama/ptrace_scope, parsed as an
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/// integer, or an error if the proc file cannot be read or has non-integer
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/// contents.
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llvm::Expected<int> GetPtraceScope();
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} // namespace process_linux
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} // namespace lldb_private
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