diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /mozglue/misc/MmapFaultHandler.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | mozglue/misc/MmapFaultHandler.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/mozglue/misc/MmapFaultHandler.h b/mozglue/misc/MmapFaultHandler.h new file mode 100644 index 0000000000..fca356921c --- /dev/null +++ b/mozglue/misc/MmapFaultHandler.h @@ -0,0 +1,113 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef MmapFaultHandler_h_ +#define MmapFaultHandler_h_ + +#if defined(XP_WIN) +// Windows + +# ifdef HAVE_SEH_EXCEPTIONS +# define MMAP_FAULT_HANDLER_BEGIN_HANDLE(fd) __try { +# define MMAP_FAULT_HANDLER_BEGIN_BUFFER(buf, bufLen) __try { +# define MMAP_FAULT_HANDLER_CATCH(retval) \ + } \ + __except (GetExceptionCode() == EXCEPTION_IN_PAGE_ERROR \ + ? EXCEPTION_EXECUTE_HANDLER \ + : EXCEPTION_CONTINUE_SEARCH) { \ + NS_WARNING("unexpected EXCEPTION_IN_PAGE_ERROR"); \ + return retval; \ + } +# else +# define MMAP_FAULT_HANDLER_BEGIN_HANDLE(fd) { +# define MMAP_FAULT_HANDLER_BEGIN_BUFFER(buf, bufLen) { +# define MMAP_FAULT_HANDLER_CATCH(retval) } +# endif + +#elif defined(XP_DARWIN) +// MacOS + +# define MMAP_FAULT_HANDLER_BEGIN_HANDLE(fd) { +# define MMAP_FAULT_HANDLER_BEGIN_BUFFER(buf, bufLen) { +# define MMAP_FAULT_HANDLER_CATCH(retval) } + +#elif defined(__wasi__) + +# define MMAP_FAULT_HANDLER_BEGIN_HANDLE(fd) { +# define MMAP_FAULT_HANDLER_BEGIN_BUFFER(buf, bufLen) { +# define MMAP_FAULT_HANDLER_CATCH(retval) } + +#else +// Linux + +# include "mozilla/Attributes.h" +# include "mozilla/Types.h" +# include <stdint.h> +# include <setjmp.h> + +class MOZ_RAII MmapAccessScope { + public: + MFBT_API MmapAccessScope(void* aBuf, uint32_t aBufLen, + const char* aFilename = nullptr); + MFBT_API ~MmapAccessScope(); + + MmapAccessScope(const MmapAccessScope&) = delete; + MmapAccessScope& operator=(const MmapAccessScope&) = delete; + + void SetThreadLocalScope(); + bool IsInsideBuffer(void* aPtr); + void CrashWithInfo(void* aPtr); + + // sigsetjmp cannot be called from a method that returns before calling + // siglongjmp, so the macro must call sigsetjmp directly and mJmpBuf must be + // public. + sigjmp_buf mJmpBuf; + + private: + void* mBuf; + const char* mFilename; + uint32_t mBufLen; + MmapAccessScope* mPreviousScope; +}; + +// Gets around warnings for null-checking in a macro. +template <typename T> +inline bool ValidFD(T fd) { + return !!fd; +} + +# define MMAP_FAULT_HANDLER_BEGIN_HANDLE(fd) \ + { \ + void* mmapScopeBuf = nullptr; \ + nsCString mmapScopeFilename; \ + uint32_t mmapScopeBufLen = 0; \ + if (ValidFD(fd) && fd->mMap) { \ + mmapScopeBuf = (void*)fd->mFileStart; \ + mmapScopeBufLen = fd->mTotalLen; \ + } \ + if (ValidFD(fd) && fd->mFile) { \ + nsCOMPtr<nsIFile> file = fd->mFile.GetBaseFile(); \ + if (file) { \ + file->GetNativeLeafName(mmapScopeFilename); \ + } \ + } \ + MmapAccessScope mmapScope(mmapScopeBuf, mmapScopeBufLen, \ + mmapScopeFilename.get()); \ + if (sigsetjmp(mmapScope.mJmpBuf, 0) == 0) { +# define MMAP_FAULT_HANDLER_BEGIN_BUFFER(buf, bufLen) \ + { \ + MmapAccessScope mmapScope((void*)(buf), (bufLen)); \ + if (sigsetjmp(mmapScope.mJmpBuf, 0) == 0) { +# define MMAP_FAULT_HANDLER_CATCH(retval) \ + } \ + else { \ + NS_WARNING("SIGBUS received when accessing mmapped file"); \ + return retval; \ + } \ + } + +#endif + +#endif |