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Fix 'adb shell /system/bin/linker' crash

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Bug: https://code.google.com/p/android/issues/detail?id=63174

(cherry picked from commit efe13832dc)

Change-Id: I43629e4a14870f67abc2dd5ff2e3040c47b2168d
This commit is contained in:
Dmitriy Ivanov 2014-07-28 15:05:51 -07:00
parent 2be1be47aa
commit 5febb0da6f
1 changed files with 14 additions and 1 deletions
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15
linker/linker.cpp
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@ -2221,6 +2221,8 @@ static ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) {
return 0;
}
extern "C" void _start();
/*
* This is the entry point for the linker, called from begin.S. This
* method is responsible for fixing the linker's own relocations, and
@ -2238,12 +2240,23 @@ extern "C" ElfW(Addr) __linker_init(void* raw_args) {
KernelArgumentBlock args(raw_args);
ElfW(Addr) linker_addr = args.getauxval(AT_BASE);
ElfW(Addr) entry_point = args.getauxval(AT_ENTRY);
ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr);
ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff);
soinfo linker_so;
memset(&linker_so, 0, sizeof(soinfo));
// If the linker is not acting as PT_INTERP entry_point is equal to
// _start. Which means that the linker is running as an executable and
// already linked by PT_INTERP.
//
// This happens when user tries to run 'adb shell /system/bin/linker'
// see also https://code.google.com/p/android/issues/detail?id=63174
if (reinterpret_cast<ElfW(Addr)>(&_start) == entry_point) {
__libc_fatal("This is %s, the helper program for shared library executables.\n", args.argv[0]);
}
strcpy(linker_so.name, "[dynamic linker]");
linker_so.base = linker_addr;
linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum);
@ -2265,7 +2278,7 @@ extern "C" ElfW(Addr) __linker_init(void* raw_args) {
_exit(EXIT_FAILURE);
}
// lets properly initialize global variables
// Initialize the linker's own global variables
linker_so.CallConstructors();
// We have successfully fixed our own relocations. It's safe to run