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tests/sysctl.c
63 строки
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Dmitry V. Levin
Reduce sysctl decoder to the bare minimum
10 дек 2022, 11:00
10 дек 2022, 11:00
4933da4
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/* * Check decoding of sysctl syscall. * * Copyright (c) 2022 Dmitry V. Levin <ldv@strace.io> * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include "scno.h" #ifdef __NR__sysctl # include <stdio.h> # include <string.h> # include <unistd.h> # include <linux/sysctl.h> static const char *errstr; static long k_sysctl(const void *const args) { const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL; const long rc = syscall(__NR__sysctl, (uintptr_t) args, bad, bad, bad, bad, bad); errstr = sprintrc(rc); return rc; } int main(void) { TAIL_ALLOC_OBJECT_CONST_PTR(struct __sysctl_args, args); void *const efault = args + 1; k_sysctl(efault); printf("_sysctl(%p) = %s\n", efault, errstr); memset(args, 0, sizeof(*args)); k_sysctl(args); printf("_sysctl({name=NULL, nlen=0, oldval=NULL, oldlenp=NULL" ", newval=NULL, newlen=0}) = %s\n", errstr); fill_memory_ex(args, sizeof(*args), 'a', 'z' - 'a' + 1); args->name = efault; k_sysctl(args); printf("_sysctl({name=%p, nlen=%d, oldval=%p, oldlenp=%p" ", newval=%p, newlen=%llu}) = %s\n", args->name, args->nlen, args->oldval, args->oldlenp, args->newval, (unsigned long long) args->newlen, errstr); puts("+++ exited with 0 +++"); return 0; } #else SKIP_MAIN_UNDEFINED("__NR__sysctl") #endif