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win: Don't attempt to read a nonexistent IMAGE_DIRECTORY_ENTRY_DEBUG

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BUG=crashpad:1
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1411123011 .
This commit is contained in:
Mark Mentovai 2015-10-28 16:42:34 -04:00
parent ba0e7de07b
commit ad9887ee0d
2 changed files with 37 additions and 10 deletions
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28
snapshot/win/pe_image_reader.cc
View File

@ -143,11 +143,20 @@ template <class NtHeadersType>
bool PEImageReader::ReadDebugDirectoryInformation(UUID* uuid,
DWORD* age,
std::string* pdbname) const {
WinVMAddress nt_headers_address;
NtHeadersType nt_headers;
if (!ReadNtHeaders(&nt_headers_address, &nt_headers))
if (!ReadNtHeaders(&nt_headers, nullptr))
return false;
if (nt_headers.FileHeader.SizeOfOptionalHeader <
offsetof(decltype(nt_headers.OptionalHeader),
DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG]) +
sizeof(nt_headers.OptionalHeader
.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG]) ||
nt_headers.OptionalHeader.NumberOfRvaAndSizes <=
IMAGE_DIRECTORY_ENTRY_DEBUG) {
return false;
}
const IMAGE_DATA_DIRECTORY& data_directory =
nt_headers.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG];
if (data_directory.VirtualAddress == 0 || data_directory.Size == 0)
@ -202,8 +211,8 @@ bool PEImageReader::ReadDebugDirectoryInformation(UUID* uuid,
}
template <class NtHeadersType>
bool PEImageReader::ReadNtHeaders(WinVMAddress* nt_headers_address,
NtHeadersType* nt_headers) const {
bool PEImageReader::ReadNtHeaders(NtHeadersType* nt_headers,
WinVMAddress* nt_headers_address) const {
IMAGE_DOS_HEADER dos_header;
if (!CheckedReadMemory(Address(), sizeof(IMAGE_DOS_HEADER), &dos_header)) {
LOG(WARNING) << "could not read dos header of " << module_name_;
@ -215,9 +224,9 @@ bool PEImageReader::ReadNtHeaders(WinVMAddress* nt_headers_address,
return false;
}
*nt_headers_address = Address() + dos_header.e_lfanew;
WinVMAddress local_nt_headers_address = Address() + dos_header.e_lfanew;
if (!CheckedReadMemory(
*nt_headers_address, sizeof(NtHeadersType), nt_headers)) {
local_nt_headers_address, sizeof(NtHeadersType), nt_headers)) {
LOG(WARNING) << "could not read nt headers of " << module_name_;
return false;
}
@ -227,6 +236,9 @@ bool PEImageReader::ReadNtHeaders(WinVMAddress* nt_headers_address,
return false;
}
if (nt_headers_address)
*nt_headers_address = local_nt_headers_address;
return true;
}
@ -238,9 +250,9 @@ bool PEImageReader::GetSectionByName(const std::string& name,
return false;
}
WinVMAddress nt_headers_address;
NtHeadersType nt_headers;
if (!ReadNtHeaders(&nt_headers_address, &nt_headers))
WinVMAddress nt_headers_address;
if (!ReadNtHeaders(&nt_headers, &nt_headers_address))
return false;
WinVMAddress first_section_address =

19
snapshot/win/pe_image_reader.h
View File

@ -109,15 +109,30 @@ class PEImageReader {
private:
//! \brief Implementation helper for DebugDirectoryInformation() templated by
//! `IMAGE_NT_HEADERS` type for different bitnesses.
//!
//! \return `true` on success, with the parameters set appropriately. `false`
//! on failure. This method may return `false` without logging anything in
//! the case of a module that does not contain relevant debugging
//! information but is otherwise properly structured.
template <class NtHeadersType>
bool ReadDebugDirectoryInformation(UUID* uuid,
DWORD* age,
std::string* pdbname) const;
//! \brief Reads the `IMAGE_NT_HEADERS` from the beginning of the image.
//!
//! \param[out] nt_headers The contents of the templated NtHeadersType
//! structure read from the remote process.
//! \param[out] nt_headers_address The address of the templated NtHeadersType
//! structure in the remote process’ address space. If this information is
//! not needed, this parameter may be `nullptr`.
//!
//! \return `true` on success, with \a nt_headers and optionally \a
//! nt_headers_address set appropriately. `false` on failure, with a
//! message logged.
template <class NtHeadersType>
bool ReadNtHeaders(WinVMAddress* nt_header_address,
NtHeadersType* nt_headers) const;
bool ReadNtHeaders(NtHeadersType* nt_headers,
WinVMAddress* nt_headers_address) const;
//! \brief Finds a given section by name in the image.
template <class NtHeadersType>