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Implement load at fixed address feature

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Bug: http://b/24683631
Change-Id: I3a39ab526c8f9e213339b60e135e5459d0f41381
This commit is contained in:
Dmitriy Ivanov
2015-10-07 16:34:20 -07:00
parent 6a4ddeb56e
commit 126af757c6
4 changed files with 77 additions and 3 deletions
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14
linker/linker_phdr.cpp
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@@ -386,8 +386,9 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) {
void* start;
size_t reserved_size = 0;
bool reserved_hint = true;
bool strict_hint = false;
// Assume position independent executable by default.
uint8_t* mmap_hint = nullptr;
void* mmap_hint = nullptr;
if (extinfo != nullptr) {
if (extinfo->flags & ANDROID_DLEXT_RESERVED_ADDRESS) {
@@ -397,8 +398,11 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) {
reserved_size = extinfo->reserved_size;
}
if ((extinfo->flags & ANDROID_DLEXT_FORCE_FIXED_VADDR) != 0) {
if (addr != nullptr && (extinfo->flags & ANDROID_DLEXT_FORCE_FIXED_VADDR) != 0) {
mmap_hint = addr;
} else if ((extinfo->flags & ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS) != 0) {
mmap_hint = extinfo->reserved_addr;
strict_hint = true;
}
}
@@ -414,6 +418,12 @@ bool ElfReader::ReserveAddressSpace(const android_dlextinfo* extinfo) {
DL_ERR("couldn't reserve %zd bytes of address space for \"%s\"", load_size_, name_.c_str());
return false;
}
if (strict_hint && (start != mmap_hint)) {
munmap(start, load_size_);
DL_ERR("couldn't reserve %zd bytes of address space at %p for \"%s\"",
load_size_, mmap_hint, name_.c_str());
return false;
}
} else {
start = extinfo->reserved_addr;
}