Userspace fexec

Implements fork and execve here instead of in the kernel.

assigned to @4lDO2

added 27 commits

• 0c9203e0...0bd81aa3 - 5 commits from branch redox-os:master
• 2186cd1f - Implement fexec in userspace.
• c95d276a - Allow POSIX's `environ` to be set.
• 37cc4e53 - WIP: Add setuid/setgid support.
• a7c817d8 - WIP: Support setuid/setgid
• bb45466a - Implement clone in userspace.
• 777a82b5 - Refactor out clone, fix some fd leaks.
• df8e2ded - Fix file descriptor leak in fork().
• 1476cdeb - Split fexec_impl into crate, used by escalated.
• bac2509c - Fix leaks for setuid/setgid too.
• 05446070 - Use same rust-toolchain version as elsewhere.
• 3701ea3b - Conflict-proof #[global_allocator] symbols too.
• b930cc98 - Correctly preserve and set MXCSR and FCW.
• 8ac0626b - Handle sigactions properly in execve and fork.
• 24ecd6ee - Fix waitpid deadlock.
• db16393f - Manually init FPU context in pte_clone.
• 049a5156 - Implement PT_INTERP, and thus dynamic linking.
• 4e5ccbff - Allow constructors to access env vars.
• b58ad5bf - In clone, use better asm function names and align.
• ed196516 - Only inherit environ from ldso if previously NULL.
• d32dd52d - Use 2021 edition in redox-exec
• 985b2a59 - Use better interfaces in exec/clone
• 13cbac29 - Fix write to mmap-min-addr

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added 1 commit

• f438a425 - Use redox_syscall 0.3 from crates.io

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approved this merge request

marked this merge request as ready

merged

mentioned in commit aa2397ce