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Some C library functions are commonly implemented by different syscalls
on different architectures. Add a mechanism to allow selected syscalls
for a single architecture, syntax in #syscalls comment is:
#syscalls <arch>:<name>
e.g. s390x:socketcall, given that socketcall() is commonly used there
instead of socket().
This is now implemented by a compiler probe for syscall numbers,
auditd tools (ausyscall) are not required anymore as a result.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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On some distributions, on ppc64, ulimit -s returns 'unlimited': add a
reasonable default, and also make sure ulimit is invoked using the
default shell, which should ensure ulimit is actually implemented.
Also note that AUDIT_ARCH doesn't follow closely the naming reported
by 'uname -m': convert for i386 and ppc as needed.
While at it, move inclusion of seccomp.h after util.h, the former is
less generic (cosmetic/clang-tidy only).
Older kernel headers might lack a definition for AUDIT_ARCH_PPC64LE:
define that explicitly if it's not available.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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...try sourcing it with the compiler from <sys/syscalls.h> before
giving up.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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List of allowed syscalls comes from comments in the form:
#syscalls <list>
for syscalls needed both in passt and pasta mode, and:
#syscalls:pasta <list>
#syscalls:passt <list>
for syscalls specifically needed in pasta or passt mode only.
seccomp.sh builds a list of BPF statements from those comments,
prefixed by a binary search tree to keep lookup fast.
While at it, clean up a bit the Makefile using wildcards.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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