This helps write the kind of 'log, but allow' policy described in
[`notify.h`](b9c84a1f75/sandboxed_api/sandbox2/notify.h (L57)) for all system calls not mentioned explicitly. One use case is writing a "permissive mode" runtime to give more information during development.
PiperOrigin-RevId: 603766051
Change-Id: I3c72f433a1e21c330b5dd9f1ede2faa570b75b09
New wrappers:
- `AllowEpollWait` (`epoll_wait`, `epoll_pwait`, `epoll_pwait2`)
- `AllowInotifyInit` (`inotify_init`, `inotify_init1`)
- `AllowSelect` (`select`, `pselect6`)
- `AllowDup` (`dup`, `dup2`, `dup3`)
- `AllowPipe` (`pipe`, `pipe2`)
- `AllowChmod` (`chmod`, `fchmod`, `fchmodat`)
- `AllowChown` (`chown`, `lchown`, `fchown`, `fchownat`)
- `AllowReadlink` (`readlink`, `readlinkat`)
- `AllowLink` (`link`, `linkat`)
- `AllowSymlink` (`symlink`, `symlinkat`)
- `AllowMkdir` (`mkdir`, `mkdirat`)
- `AllowUtime` (`utime`, `utimes`, `futimens`, `utimensat`)
- `AllowAlarm` (`alarm`, `setitimer`)
- `AllowGetPGIDs` (`getpgid`, `getpgrp`)
- `AllowPoll` (`poll`, `ppoll`)
Updated wrappers:
- `AllowOpen` now includes `creat`. `openat` already grants the ability to create files, and is the designated replacement for `creat` on newer platforms.
- `AllowStat` now includes `fstatfs` and `fstatfs64`. The comment already claimed that these syscalls were included; I believe they were omitted by accident.
- `AllowUnlink` now includes `rmdir`. `unlinkat` already grants the ability to remove empty directories, and is the designated replacement for `rmdir` on newer platforms.
PiperOrigin-RevId: 495045432
Change-Id: I41eccb74fda250b27586b6b7fe4c480332e48846
Follow-up changes might be required to fully fix up the contrib sandboxes.
PiperOrigin-RevId: 482475998
Change-Id: Iff631eb838a024b2f047a1be61bb27e35a8ff2f4
- Allow to specify multiple syscalls with `BlockSyscallsWithErrno()`
- Add functions to allow `unlink()` and `rename()` in all their spellings
PiperOrigin-RevId: 414987303
Change-Id: Ic0e680b785e8e3a3498f20e6a7403737e63fe876
For OSS, this change should be mostly a no-op. Visible edits are due to
changed order of code and/or includes.
PiperOrigin-RevId: 394177395
Change-Id: I1d32f9fd175579e8f05c051b1307953b249d139d
This mainly a debugging facility.
It makes diagnosing problems where sandboxed process just randomly exits whereas unsandboxed one runs to completion due to differences in the setup/environment much easier.
PiperOrigin-RevId: 391005548
Change-Id: Ia19fe6632748da93c1f4291bb55e895f50a4e2b0
1. In many cases, sandboxes need to allow /proc/stat and /proc/cpuinfo so that
get_nprocs(3) will work; otherwise, per-CPU logic can't determine how many CPUs
there are. Unfortunately, some of those sandboxes also disable namespaces. The
solution is to provide two functions: AllowRestartableSequencesWithProcFiles(),
which allows syscalls and files; and AllowRestartableSequences(), which allows
syscalls only. Sandboxes should usually call the former; sandboxes that disable
namespaces should instead call the latter and are responsible for allowing the
files via the deprecated Fs mechanism.
2. Make the mmap(2) policy evaluate prot AND flags, not prot OR flags.
3. Order the code and the comments identically for better readability.
PiperOrigin-RevId: 386414028
Change-Id: I016b1854ed1da9c9bcff7b351c5e0041093b8193
The default policy causes immediate termination of a sandboxee that
calls `bpf`(2).
This does not allow for try-call use of `bpf()` to test for optional
features.
To support such try-call use cases, sandboxes would like to say:
```
sandbox2::PolicyBuilder builder;
builder.BlockSyscallWithErrno(__NR_bpf, EPERM);
```
but this doesn't work because the default policy unconditionally treats
`bpf()` as a sandbox violation.
Remove the bpf violation check from the policy if `bpf()` is explicitly
blocked with an errno.
PiperOrigin-RevId: 345239389
Change-Id: I7fcfd3a938c610c8679edf8e1fa0238b32cc9db4
This allows us to remove some uses of macros.
Related changes:
- Make it clear that we support hosting sandboxed binaries from 64-bit
processes only. CPU architectures are x86-64 and POWER64 (little endian).
- Introduced CPU architecture macros, abstracting away compiler specifics
PiperOrigin-RevId: 330918134
Change-Id: Ife7ad5f14723eec9f68055127b0583b8aecd38dd
