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Add RTLD_NODELETE flag support

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Bug: 18186310
Bug: https://code.google.com/p/android/issues/detail?id=64069

(cherry picked from commit 1b20dafdbe)

Change-Id: Ic02eec22a7c322ece65eb40730a3404f611526b1
This commit is contained in:
Dmitriy Ivanov
2014-05-19 15:06:58 -07:00
parent 210ff1b27b
commit c87f65d2cd
8 changed files with 226 additions and 10 deletions
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16
linker/linker.cpp
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@@ -987,6 +987,11 @@ static soinfo* find_library(const char* name, int rtld_flags, const android_dlex
}
static void soinfo_unload(soinfo* si) {
if (!si->can_unload()) {
TRACE("not unloading '%s' - the binary is flagged with NODELETE", si->name);
return;
}
if (si->ref_count == 1) {
TRACE("unloading '%s'", si->name);
si->CallDestructors();
@@ -1045,7 +1050,7 @@ void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
}
soinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) {
if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NOLOAD)) != 0) {
if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NODELETE|RTLD_NOLOAD)) != 0) {
DL_ERR("invalid flags to dlopen: %x", flags);
return nullptr;
}
@@ -1808,6 +1813,9 @@ const char* soinfo::get_string(ElfW(Word) index) const {
return strtab + index;
}
bool soinfo::can_unload() const {
return (rtld_flags & (RTLD_NODELETE | RTLD_GLOBAL)) == 0;
}
/* Force any of the closed stdin, stdout and stderr to be associated with
/dev/null. */
static int nullify_closed_stdio() {
@@ -2076,9 +2084,13 @@ bool soinfo::PrelinkImage() {
if ((d->d_un.d_val & DF_1_GLOBAL) != 0) {
rtld_flags |= RTLD_GLOBAL;
}
if ((d->d_un.d_val & DF_1_NODELETE) != 0) {
rtld_flags |= RTLD_NODELETE;
}
// TODO: Implement other flags
if ((d->d_un.d_val & ~(DF_1_NOW | DF_1_GLOBAL)) != 0) {
if ((d->d_un.d_val & ~(DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE)) != 0) {
DL_WARN("Unsupported flags DT_FLAGS_1=%p", reinterpret_cast<void*>(d->d_un.d_val));
}
break;