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Kernel+LibELF: Expose ELF Auxiliary Vector to Userspace

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The AT_* entries are placed after the environment variables, so that
they can be found by iterating until the end of the envp array, and then
going even further beyond :^)
This commit is contained in:
Andrew Kaster 2020-07-04 17:37:36 -06:00 • committed by Andreas Kling
parent 8b76a1e548
commit f96b827990
5 changed files with 200 additions and 28 deletions
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9
Kernel/Process.h
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@ -33,15 +33,16 @@
#include <AK/NonnullOwnPtrVector.h>
#include <AK/String.h>
#include <AK/WeakPtr.h>
#include <Kernel/API/Syscall.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/Forward.h>
#include <Kernel/Lock.h>
#include <Kernel/StdLib.h>
#include <Kernel/API/Syscall.h>
#include <Kernel/Thread.h>
#include <Kernel/UnixTypes.h>
#include <Kernel/VM/RangeAllocator.h>
#include <LibC/signal_numbers.h>
#include <LibELF/AuxiliaryVector.h>
namespace ELF {
class Loader;
@ -475,6 +476,7 @@ private:
ssize_t do_write(FileDescription&, const u8*, int data_size);
KResultOr<NonnullRefPtr<FileDescription>> find_elf_interpreter_for_executable(const String& path, char (&first_page)[PAGE_SIZE], int nread, size_t file_size);
Vector<AuxiliaryValue> generate_auxiliary_vector() const;
int alloc_fd(int first_candidate_fd = 0);
void disown_all_shared_buffers();
@ -510,6 +512,8 @@ private:
gid_t m_sgid { 0 };
pid_t m_exec_tid { 0 };
FlatPtr m_load_offset { 0U };
FlatPtr m_entry_eip { 0U };
static const int m_max_open_file_descriptors { FD_SETSIZE };
@ -661,8 +665,7 @@ inline void Process::for_each_thread(Callback callback) const
if (my_pid == 0) {
// NOTE: Special case the colonel process, since its main thread is not in the global thread table.
Processor::for_each(
[&](Processor& proc) -> IterationDecision
{
[&](Processor& proc) -> IterationDecision {
auto idle_thread = proc.idle_thread();
if (idle_thread != nullptr)
return callback(*idle_thread);