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base-linux: avoid legacy syscalls

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Until now, Genode's Linux system call bindings were based on original
Unix system calls that were later superseded by more flexibile variants.
E.g., 'openat' is a modern version of 'open'. Even though Linux upholds
the compatiblity with the original versions for existing architectures
like x86, the legacy syscalls are absent for the recently added AARCH64
architecture. A good overview of the system calls accross the prominent
architectures can be found at

https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md

This patch updates Genode's syscall bindings to avoid legacy versions,
thereby easing the support for AARCH64. The used "modern" versions
were introduced back in Linux version 2 days. So we are fine to rely
on them.

The patch slightly changes the signature for lx_stat because this system
call is merely used to check for the existance of a file and its size.
The new name 'lx_stat_size' draws a closer connection to its use case.
That said, the stat syscall has not been updated to the modern statx
since statx is still a fairly recent addition.

Issue #4136
This commit is contained in:
Norman Feske
2021-05-04 12:18:48 +02:00
parent d477062c56
commit fdb1a4dd88
7 changed files with 26 additions and 19 deletions
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4
tool/seccomp/seccomp_bpf_compiler.h
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@@ -90,9 +90,9 @@ class Filter
_add_allow_rule(SCMP_SYS(recvmsg));
_add_allow_rule(SCMP_SYS(write));
_add_allow_rule(SCMP_SYS(poll));
_add_allow_rule(SCMP_SYS(epoll_create));
_add_allow_rule(SCMP_SYS(epoll_create1));
_add_allow_rule(SCMP_SYS(epoll_ctl));
_add_allow_rule(SCMP_SYS(epoll_wait));
_add_allow_rule(SCMP_SYS(epoll_pwait));
_add_allow_rule(SCMP_SYS(close));
_add_allow_rule(SCMP_SYS(munmap));
_add_allow_rule(SCMP_SYS(dup));