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| author | Dmitriy Ivanov <dimitry@google.com> | 2015-06-05 22:16:23 -0700 |
|---|---|---|
| committer | Dmitriy Ivanov <dimitry@google.com> | 2015-06-09 13:44:31 -0700 |
| commit | 8a1162835597be38705b381ac34c07da17932568 (patch) | |
| tree | 13fb64618cf74789d9f47d7d438eda0e3fd27607 /linker/linker_phdr.cpp | |
| parent | d9dc13d4172516342ceebf1b16624ed9fdf3fca2 (diff) | |
| download | bionic-8a1162835597be38705b381ac34c07da17932568.tar.gz | |
Add flag that makes linker honor min(p_vaddr)
Bug: http://b/21523078
Change-Id: Ice72766fb6ad3bd333c32b496e7870121e17a763
Diffstat (limited to 'linker/linker_phdr.cpp')
| -rw-r--r-- | linker/linker_phdr.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp index 638c9d6ba..f586b08b5 100644 --- a/linker/linker_phdr.cpp +++ b/linker/linker_phdr.cpp @@ -316,6 +316,8 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) { void* start; size_t reserved_size = 0; bool reserved_hint = true; + // Assume position independent executable by default. + uint8_t* mmap_hint = nullptr; if (extinfo != nullptr) { if (extinfo->flags & ANDROID_DLEXT_RESERVED_ADDRESS) { @@ -324,6 +326,10 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) { } else if (extinfo->flags & ANDROID_DLEXT_RESERVED_ADDRESS_HINT) { reserved_size = extinfo->reserved_size; } + + if ((extinfo->flags & ANDROID_DLEXT_FORCE_FIXED_VADDR) != 0) { + mmap_hint = addr; + } } if (load_size_ > reserved_size) { @@ -333,7 +339,7 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) { return false; } int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS; - start = mmap(nullptr, load_size_, PROT_NONE, mmap_flags, -1, 0); + start = mmap(mmap_hint, load_size_, PROT_NONE, mmap_flags, -1, 0); if (start == MAP_FAILED) { DL_ERR("couldn't reserve %zd bytes of address space for \"%s\"", load_size_, name_); return false; |