syscall-munmap-b1f880b-sys_munmap-unwrap

Reachable unwrap panic in sys_munmap() at legacy.rs

Reference

Describe the bug

There is a reachable unwrap panic in sys_munmap() caused by aligning large len (i.e., 0xffffffffffffffff) of a munmap syscall.

https://github.com/syswonder/ruxos/blob/b1f880b603cc1e578af16292f3b8a848766ea285/api/ruxos_posix_api/src/imp/mmap/legacy.rs#L72

To Reproduce

1. Compile a program which calls munmap:

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

int main()
{
    void *addr = mmap(NULL, 4096, 0x3, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    munmap(addr, 0xffffffffffffffff);

    return 0;
}

With following features:

alloc 
irq
musl
multitask
fs
pipe
poll
rtc
signal
virtio-9p

2. Run the compiled program in RuxOS.

Expected behavior

RuxOS reports panic and is terminated.

Environment

• RuxOS version: main b1f880b
• ubuntu:22.04 in Docker
• 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz

Logs

[1728388549.205894 0:2 ruxos_posix_api::imp::mmap::legacy:67] sys_munmap <= start: 0xffffff80003fe000, len: 18446744073709551615
[1728388549.206739 0:2 ruxruntime::lang_items:14] panicked at api/ruxos_posix_api/src/imp/mmap/legacy.rs:72:54:
called `Result::unwrap()` on an `Err` value: LayoutError
[1728388549.207796 0:2 ruxhal::platform::x86_pc::misc:16] Shutting down...

syscall-mmap-b1f880b-sys_mmap-unwrap

Reachable unwrap panic in sys_mmap() at legacy.rs

To Reproduce

1. Compile a program which calls munmap:

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

int main()
{
    mmap(NULL, 0x7ffffffffffffffe, 0x3, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

    return 0;
}

With following features:

alloc 
irq
musl
multitask
pipe
poll
rtc
signal
virtio-9p

2. Run the compiled program in RuxOS.

Logs

[1728436128.205115 0:2 ruxmusl::x86_64:10] x86 syscall <= syscall_name: MMAP
[1728436128.205642 0:2 ruxos_posix_api::imp::mmap::legacy:32] sys_mmap <= start: 0x0, len: 9223372036854775806, fd: -1
[1728436128.206396 0:2 ruxruntime::lang_items:14] panicked at api/ruxos_posix_api/src/imp/mmap/legacy.rs:44:54:
called `Result::unwrap()` on an `Err` value: LayoutError
[1728436128.207400 0:2 ruxhal::platform::x86_pc::misc:16] Shutting down...