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14 commits

Author SHA1 Message Date
Gunnar Beutner
dd39bb7784 DynamicLoader: Remove math functionality in favor of -lgcc
This links the dynamic linker against libgcc.a instead of having
our own copy of the math functions.

For now we need to specify -fbuilding-libgcc as a hack to work
around a bug with the -nodefaultlibs flag. Once everyone is on
the latest toolchain version this can be removed.
2021-05-07 15:35:50 +02:00
Brian Gianforcaro
8ae3191ab5 Tests: Unify LibC tests to single location.
In a1720eed2a I added this new test,
but missed that there were already some "unit tests" for LibC over
in Userland/Tests/LibC. So lets unify these two locations.
2021-04-29 10:37:26 +02:00
Brian Gianforcaro
a1720eed2a LibC: Setup a unit test harness for LibC, add ctime_r / asctime_r tests.
LibC is no different than any other code, it should be unit tested where
appropriate / possible.
2021-04-21 08:04:52 +02:00
Gunnar Beutner
88cebb05ad LibC+LibPthread: Implement function forwarding for libpthread
GCC will insert various calls to pthread functions when compiling
C++ code with static initializers, even when the user doesn't link
their program against libpthread explicitly.

This is used to make static initializers thread-safe, e.g. when
building a library that does not itself use thread functionality
and thus does not link against libpthread - but is intended to
be used with other code that does use libpthread explicitly.

This makes these symbols available in libc.
2021-04-20 21:08:17 +02:00
Hendiadyoin1
009b196a04 LibC: Add x86_64 Registers 2021-03-21 09:35:23 +01:00
Andreas Kling
8714f389f9 LibC: Add x86_64 implementation of setjmp() and longjmp() 2021-02-25 16:27:12 +01:00
Andreas Kling
412cb66666 Revert "DynamicLoader: Remove unnecessary math functions"
This reverts commit b1f1f5afcf.

Unfortunately this broke dbgln() in the dynamic loader. We need to
figure out how to link libgcc into it properly.
2021-02-08 19:58:10 +01:00
Andreas Kling
b1f1f5afcf DynamicLoader: Remove unnecessary math functions
These are provided by libgcc.
2021-02-07 14:21:53 +01:00
Andreas Kling
e87eac9273 Userland: Add LibSystem and funnel all syscalls through it
This achieves two things:

- Programs can now intentionally perform arbitrary syscalls by calling
  syscall(). This allows us to work on things like syscall fuzzing.

- It restricts the ability of userspace to make syscalls to a single
  4KB page of code. In order to call the kernel directly, an attacker
  must now locate this page and call through it.
2021-02-05 12:23:39 +01:00
Andreas Kling
13d7c09125 Libraries: Move to Userland/Libraries/ 2021-01-12 12:17:46 +01:00
Brian Gianforcaro
06da50afc7 Build + LibC: Enable -fstack-protector-strong in user space
Modify the user mode runtime to insert stack canaries to find stack corruptions.

The `-fstack-protector-strong` variant was chosen because it catches more
issues than vanilla `-fstack-protector`, but doesn't have substantial
performance impact like `-fstack-protector-all`.

Details:

    -fstack-protector enables stack protection for vulnerable functions that contain:

    * A character array larger than 8 bytes.
    * An 8-bit integer array larger than 8 bytes.
    * A call to alloca() with either a variable size or a constant size bigger than 8 bytes.

    -fstack-protector-strong enables stack protection for vulnerable functions that contain:

    * An array of any size and type.
    * A call to alloca().
    * A local variable that has its address taken.

Example of it catching corrupting in the `stack-smash` test:
```
courage ~ $ ./user/Tests/LibC/stack-smash
[+] Starting the stack smash ...
Error: Stack protector failure, stack smashing detected!
Shell: Job 1 (/usr/Tests/LibC/stack-smash) Aborted
```
2021-01-02 11:34:55 +01:00
Andrew Kaster
350d4d3543 Meta: Enable RTTI for Userspace programs
RTTI is still disabled for the Kernel, and for the Dynamic Loader. This
allows for much less awkward navigation of class heirarchies in LibCore,
LibGUI, LibWeb, and LibJS (eventually). Measured RootFS size increase
was < 1%, and libgui.so binary size was ~3.3%. The small binary size
increase here seems worth it :^)
2021-01-01 14:45:09 +01:00
Andrew Kaster
a3a9016701 DynamicLoader: Tell the linker to not add a PT_INTERP header
Use the GNU LD option --no-dynamic-linker. This allows uncommenting some
code in the Kernel that gets upset if your ELF interpreter has its own
interpreter.
2021-01-01 02:12:28 +01:00
Itamar
07b4957361 Loader: Add dynamic loader program
The dynamic loader exists as /usr/lib/Loader.so and is loaded by the
kernel when ET_DYN programs are executed.

The dynamic loader is responsible for loading the dependencies of the
main program, allocating TLS storage, preparing all loaded objects for
execution and finally jumping to the entry of the main program.
2020-12-14 23:05:53 +01:00