2fa95ae169
linux/*/syscallent*.h part is modified automatically by: sed -i 's/TF\(,[[:space:]]*SEN.*[_"]statv\?fs\)/TF|TSF\1/' \ linux/*/syscallent*.h [ldv: rewritten trace_statfs.test using sched.test as a template] * sysent.h (TRACE_STATFS): New macro. * syscall.c: Alias TSF to TRACE_STATFS around syscallent.h inclusion. * qualify.c (lookup_class): Add SCHED_STATFS for "%statfs". * strace.1 (.SS Filtering): Add information about %statfs syscall class. * NEWS: Mention this change. * linux/64/syscallent.h (statfs): Add TSF flag. * linux/aarch64/syscallent.h: Likewise. * linux/x32/syscallent.h: Likewise. * linux/x86_64/syscallent.h: Likewise. * linux/mips/syscallent-n64.h: Likewise. * linux/32/syscallent.h (statfs64): Likewise. * linux/arm/syscallent.h (statfs, statfs64): Likewise. * linux/avr32/syscallent.h: Likewise. * linux/bfin/syscallent.h: Likewise. * linux/crisv10/syscallent.h: Likewise. * linux/hppa/syscallent.h: Likewise. * linux/i386/syscallent.h: Likewise. * linux/ia64/syscallent.h: Likewise. * linux/m68k/syscallent.h: Likewise. * linux/microblaze/syscallent.h: Likewise. * linux/mips/syscallent-n32.h: Likewise. * linux/mips/syscallent-o32.h: Likewise. * linux/powerpc/syscallent.h: Likewise. * linux/powerpc64/syscallent.h: Likewise. * linux/s390/syscallent.h: Likewise. * linux/s390x/syscallent.h: Likewise. * linux/sh/syscallent.h: Likewise. * linux/sh64/syscallent.h: Likewise. * linux/sparc/syscallent.h: Likewise. * linux/sparc64/syscallent.h: Likewise. * linux/xtensa/syscallent.h: Likewise. * linux/alpha/syscallent.h (osf_statfs, osf_statfs64, statfs): Likewise. * linux/mips/syscallent-compat.h (*_statfs, *_statvfs): Likewise. * tests/trace_statfs.test: New test. * tests/Makefile.am (DECODER_TESTS): Add it. * tests/ksysent.c (TSF): New macro, defined to 0. * tests/nsyscalls.c: Likewise.
651 lines
15 KiB
C
651 lines
15 KiB
C
/*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include "nsig.h"
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typedef unsigned int number_slot_t;
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#define BITS_PER_SLOT (sizeof(number_slot_t) * 8)
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struct number_set {
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number_slot_t *vec;
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unsigned int nslots;
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bool not;
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};
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struct number_set read_set;
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struct number_set write_set;
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struct number_set signal_set;
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static struct number_set abbrev_set[SUPPORTED_PERSONALITIES];
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static struct number_set inject_set[SUPPORTED_PERSONALITIES];
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static struct number_set raw_set[SUPPORTED_PERSONALITIES];
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static struct number_set trace_set[SUPPORTED_PERSONALITIES];
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static struct number_set verbose_set[SUPPORTED_PERSONALITIES];
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static void
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number_setbit(const unsigned int i, number_slot_t *const vec)
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{
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vec[i / BITS_PER_SLOT] |= (number_slot_t) 1 << (i % BITS_PER_SLOT);
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}
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static bool
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number_isset(const unsigned int i, const number_slot_t *const vec)
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{
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return vec[i / BITS_PER_SLOT] & ((number_slot_t) 1 << (i % BITS_PER_SLOT));
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}
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static void
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reallocate_number_set(struct number_set *const set, const unsigned int new_nslots)
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{
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if (new_nslots <= set->nslots)
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return;
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set->vec = xreallocarray(set->vec, new_nslots, sizeof(*set->vec));
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memset(set->vec + set->nslots, 0,
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sizeof(*set->vec) * (new_nslots - set->nslots));
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set->nslots = new_nslots;
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}
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static void
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add_number_to_set(const unsigned int number, struct number_set *const set)
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{
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reallocate_number_set(set, number / BITS_PER_SLOT + 1);
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number_setbit(number, set->vec);
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}
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bool
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is_number_in_set(const unsigned int number, const struct number_set *const set)
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{
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return ((number / BITS_PER_SLOT < set->nslots)
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&& number_isset(number, set->vec)) ^ set->not;
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}
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typedef int (*string_to_uint_func)(const char *);
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/*
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* Add numbers to SET according to STR specification.
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*/
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static void
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qualify_tokens(const char *const str, struct number_set *const set,
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string_to_uint_func func, const char *const name)
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{
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/* Clear the set. */
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if (set->nslots)
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memset(set->vec, 0, sizeof(*set->vec) * set->nslots);
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set->not = false;
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/*
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* Each leading ! character means inversion
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* of the remaining specification.
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*/
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const char *s = str;
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handle_inversion:
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while (*s == '!') {
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set->not = !set->not;
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++s;
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}
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if (strcmp(s, "none") == 0) {
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/*
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* No numbers are added to the set.
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* Subsequent is_number_in_set invocations will return set->not.
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*/
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return;
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} else if (strcmp(s, "all") == 0) {
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s = "!none";
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goto handle_inversion;
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}
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/*
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* Split the string into comma separated tokens.
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* For each token, find out the corresponding number
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* by calling FUNC, and add that number to the set.
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* The absence of tokens or a negative answer
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* from FUNC is a fatal error.
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*/
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char *copy = xstrdup(s);
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char *saveptr = NULL;
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const char *token;
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int number = -1;
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for (token = strtok_r(copy, ",", &saveptr); token;
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token = strtok_r(NULL, ",", &saveptr)) {
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number = func(token);
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if (number < 0) {
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error_msg_and_die("invalid %s '%s'", name, token);
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}
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add_number_to_set(number, set);
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}
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free(copy);
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if (number < 0) {
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error_msg_and_die("invalid %s '%s'", name, str);
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}
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}
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static int
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sigstr_to_uint(const char *s)
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{
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int i;
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if (*s >= '0' && *s <= '9')
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return string_to_uint_upto(s, 255);
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if (strncasecmp(s, "SIG", 3) == 0)
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s += 3;
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for (i = 0; i <= 255; ++i) {
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const char *name = signame(i);
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if (strncasecmp(name, "SIG", 3) != 0)
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continue;
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name += 3;
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if (strcasecmp(name, s) != 0)
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continue;
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return i;
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}
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return -1;
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}
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static bool
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qualify_syscall_number(const char *s, struct number_set *set)
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{
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int n = string_to_uint(s);
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if (n < 0)
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return false;
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unsigned int p;
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bool done = false;
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for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
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if ((unsigned) n >= nsyscall_vec[p]) {
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continue;
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}
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add_number_to_set(n, &set[p]);
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done = true;
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}
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return done;
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}
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static unsigned int
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lookup_class(const char *s)
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{
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static const struct {
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const char *name;
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unsigned int value;
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} syscall_class[] = {
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{ "desc", TRACE_DESC },
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{ "file", TRACE_FILE },
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{ "memory", TRACE_MEMORY },
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{ "process", TRACE_PROCESS },
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{ "signal", TRACE_SIGNAL },
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{ "ipc", TRACE_IPC },
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{ "network", TRACE_NETWORK },
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{ "%desc", TRACE_DESC },
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{ "%file", TRACE_FILE },
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{ "%memory", TRACE_MEMORY },
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{ "%process", TRACE_PROCESS },
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{ "%signal", TRACE_SIGNAL },
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{ "%ipc", TRACE_IPC },
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{ "%network", TRACE_NETWORK },
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{ "%sched", TRACE_SCHED },
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{ "%clock", TRACE_CLOCK },
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{ "%statfs", TRACE_STATFS },
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};
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(syscall_class); ++i) {
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if (strcmp(s, syscall_class[i].name) == 0) {
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return syscall_class[i].value;
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}
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}
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return 0;
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}
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static bool
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qualify_syscall_class(const char *s, struct number_set *set)
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{
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const unsigned int n = lookup_class(s);
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if (!n)
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return false;
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unsigned int p;
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for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
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unsigned int i;
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for (i = 0; i < nsyscall_vec[p]; ++i) {
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if (!sysent_vec[p][i].sys_name
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|| (sysent_vec[p][i].sys_flags & n) != n) {
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continue;
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}
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add_number_to_set(i, &set[p]);
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}
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}
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return true;
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}
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static bool
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qualify_syscall_name(const char *s, struct number_set *set)
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{
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unsigned int p;
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bool found = false;
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for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
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unsigned int i;
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for (i = 0; i < nsyscall_vec[p]; ++i) {
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if (!sysent_vec[p][i].sys_name
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|| strcmp(s, sysent_vec[p][i].sys_name)) {
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continue;
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}
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add_number_to_set(i, &set[p]);
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found = true;
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}
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}
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return found;
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}
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static bool
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qualify_syscall(const char *token, struct number_set *set)
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{
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if (*token >= '0' && *token <= '9')
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return qualify_syscall_number(token, set);
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return qualify_syscall_class(token, set)
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|| qualify_syscall_name(token, set);
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}
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/*
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* Add syscall numbers to SETs for each supported personality
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* according to STR specification.
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*/
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static void
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qualify_syscall_tokens(const char *const str, struct number_set *const set,
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const char *const name)
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{
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/* Clear all sets. */
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unsigned int p;
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for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
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if (set[p].nslots)
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memset(set[p].vec, 0,
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sizeof(*set[p].vec) * set[p].nslots);
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set[p].not = false;
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}
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/*
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* Each leading ! character means inversion
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* of the remaining specification.
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*/
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const char *s = str;
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handle_inversion:
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while (*s == '!') {
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for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
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set[p].not = !set[p].not;
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}
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++s;
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}
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if (strcmp(s, "none") == 0) {
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/*
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* No syscall numbers are added to sets.
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* Subsequent is_number_in_set invocations
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* will return set[p]->not.
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*/
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return;
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} else if (strcmp(s, "all") == 0) {
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s = "!none";
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goto handle_inversion;
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}
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/*
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* Split the string into comma separated tokens.
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* For each token, call qualify_syscall that will take care
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* if adding appropriate syscall numbers to sets.
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* The absence of tokens or a negative return code
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* from qualify_syscall is a fatal error.
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*/
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char *copy = xstrdup(s);
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char *saveptr = NULL;
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const char *token;
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bool done = false;
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for (token = strtok_r(copy, ",", &saveptr); token;
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token = strtok_r(NULL, ",", &saveptr)) {
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done = qualify_syscall(token, set);
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if (!done) {
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error_msg_and_die("invalid %s '%s'", name, token);
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}
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}
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free(copy);
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if (!done) {
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error_msg_and_die("invalid %s '%s'", name, str);
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}
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}
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/*
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* Returns NULL if STR does not start with PREFIX,
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* or a pointer to the first char in STR after PREFIX.
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*/
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static const char *
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strip_prefix(const char *prefix, const char *str)
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{
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size_t len = strlen(prefix);
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return strncmp(prefix, str, len) ? NULL : str + len;
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}
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static int
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find_errno_by_name(const char *name)
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{
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unsigned int i;
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for (i = 1; i < nerrnos; ++i) {
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if (errnoent[i] && (strcasecmp(name, errnoent[i]) == 0))
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return i;
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}
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return -1;
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}
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static bool
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parse_inject_token(const char *const token, struct inject_opts *const fopts,
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const bool fault_tokens_only)
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{
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const char *val;
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int intval;
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if ((val = strip_prefix("when=", token))) {
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/*
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* == 1+1
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* F == F+0
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* F+ == F+1
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* F+S
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*/
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char *end;
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intval = string_to_uint_ex(val, &end, 0xffff, "+");
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if (intval < 1)
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return false;
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fopts->first = intval;
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if (*end) {
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val = end + 1;
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if (*val) {
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/* F+S */
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intval = string_to_uint_upto(val, 0xffff);
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if (intval < 1)
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return false;
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fopts->step = intval;
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} else {
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/* F+ == F+1 */
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fopts->step = 1;
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}
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} else {
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/* F == F+0 */
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fopts->step = 0;
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}
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} else if ((val = strip_prefix("error=", token))) {
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if (fopts->rval != INJECT_OPTS_RVAL_DEFAULT)
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return false;
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intval = string_to_uint_upto(val, MAX_ERRNO_VALUE);
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if (intval < 0)
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intval = find_errno_by_name(val);
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if (intval < 1)
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return false;
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fopts->rval = -intval;
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} else if (!fault_tokens_only && (val = strip_prefix("retval=", token))) {
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if (fopts->rval != INJECT_OPTS_RVAL_DEFAULT)
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return false;
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intval = string_to_uint(val);
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if (intval < 0)
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return false;
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fopts->rval = intval;
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} else if (!fault_tokens_only && (val = strip_prefix("signal=", token))) {
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intval = sigstr_to_uint(val);
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if (intval < 1 || intval > NSIG_BYTES * 8)
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return false;
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fopts->signo = intval;
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} else {
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return false;
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}
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return true;
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}
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static char *
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parse_inject_expression(const char *const s, char **buf,
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struct inject_opts *const fopts,
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const bool fault_tokens_only)
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{
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char *saveptr = NULL;
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char *name = NULL;
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char *token;
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*buf = xstrdup(s);
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for (token = strtok_r(*buf, ":", &saveptr); token;
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token = strtok_r(NULL, ":", &saveptr)) {
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if (!name)
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name = token;
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else if (!parse_inject_token(token, fopts, fault_tokens_only))
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goto parse_error;
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}
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if (name)
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return name;
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parse_error:
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free(*buf);
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return *buf = NULL;
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}
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static void
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qualify_read(const char *const str)
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{
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qualify_tokens(str, &read_set, string_to_uint, "descriptor");
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}
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static void
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qualify_write(const char *const str)
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{
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qualify_tokens(str, &write_set, string_to_uint, "descriptor");
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}
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static void
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qualify_signals(const char *const str)
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{
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qualify_tokens(str, &signal_set, sigstr_to_uint, "signal");
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}
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static void
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qualify_trace(const char *const str)
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{
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qualify_syscall_tokens(str, trace_set, "system call");
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}
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static void
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qualify_abbrev(const char *const str)
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{
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qualify_syscall_tokens(str, abbrev_set, "system call");
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}
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|
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static void
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qualify_verbose(const char *const str)
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{
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qualify_syscall_tokens(str, verbose_set, "system call");
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}
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static void
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|
qualify_raw(const char *const str)
|
|
{
|
|
qualify_syscall_tokens(str, raw_set, "system call");
|
|
}
|
|
|
|
static void
|
|
qualify_inject_common(const char *const str,
|
|
const bool fault_tokens_only,
|
|
const char *const description)
|
|
{
|
|
struct inject_opts opts = {
|
|
.first = 1,
|
|
.step = 1,
|
|
.rval = INJECT_OPTS_RVAL_DEFAULT,
|
|
.signo = 0
|
|
};
|
|
char *buf = NULL;
|
|
char *name = parse_inject_expression(str, &buf, &opts, fault_tokens_only);
|
|
if (!name) {
|
|
error_msg_and_die("invalid %s '%s'", description, str);
|
|
}
|
|
|
|
/* If neither of retval, error, or signal is specified, then ... */
|
|
if (opts.rval == INJECT_OPTS_RVAL_DEFAULT && !opts.signo) {
|
|
if (fault_tokens_only) {
|
|
/* in fault= syntax the default error code is ENOSYS. */
|
|
opts.rval = -ENOSYS;
|
|
} else {
|
|
/* in inject= syntax this is not allowed. */
|
|
error_msg_and_die("invalid %s '%s'", description, str);
|
|
}
|
|
}
|
|
|
|
struct number_set tmp_set[SUPPORTED_PERSONALITIES];
|
|
memset(tmp_set, 0, sizeof(tmp_set));
|
|
qualify_syscall_tokens(name, tmp_set, description);
|
|
|
|
free(buf);
|
|
|
|
/*
|
|
* Initialize inject_vec accourding to tmp_set.
|
|
* Merge tmp_set into inject_set.
|
|
*/
|
|
unsigned int p;
|
|
for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
|
|
if (!tmp_set[p].nslots && !tmp_set[p].not) {
|
|
continue;
|
|
}
|
|
|
|
if (!inject_vec[p]) {
|
|
inject_vec[p] = xcalloc(nsyscall_vec[p],
|
|
sizeof(*inject_vec[p]));
|
|
}
|
|
|
|
unsigned int i;
|
|
for (i = 0; i < nsyscall_vec[p]; ++i) {
|
|
if (is_number_in_set(i, &tmp_set[p])) {
|
|
add_number_to_set(i, &inject_set[p]);
|
|
inject_vec[p][i] = opts;
|
|
}
|
|
}
|
|
|
|
free(tmp_set[p].vec);
|
|
}
|
|
}
|
|
|
|
static void
|
|
qualify_fault(const char *const str)
|
|
{
|
|
qualify_inject_common(str, true, "fault argument");
|
|
}
|
|
|
|
static void
|
|
qualify_inject(const char *const str)
|
|
{
|
|
qualify_inject_common(str, false, "inject argument");
|
|
}
|
|
|
|
static const struct qual_options {
|
|
const char *name;
|
|
void (*qualify)(const char *);
|
|
} qual_options[] = {
|
|
{ "trace", qualify_trace },
|
|
{ "t", qualify_trace },
|
|
{ "abbrev", qualify_abbrev },
|
|
{ "a", qualify_abbrev },
|
|
{ "verbose", qualify_verbose },
|
|
{ "v", qualify_verbose },
|
|
{ "raw", qualify_raw },
|
|
{ "x", qualify_raw },
|
|
{ "signal", qualify_signals },
|
|
{ "signals", qualify_signals },
|
|
{ "s", qualify_signals },
|
|
{ "read", qualify_read },
|
|
{ "reads", qualify_read },
|
|
{ "r", qualify_read },
|
|
{ "write", qualify_write },
|
|
{ "writes", qualify_write },
|
|
{ "w", qualify_write },
|
|
{ "fault", qualify_fault },
|
|
{ "inject", qualify_inject },
|
|
};
|
|
|
|
void
|
|
qualify(const char *str)
|
|
{
|
|
const struct qual_options *opt = qual_options;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(qual_options); ++i) {
|
|
const char *p = qual_options[i].name;
|
|
unsigned int len = strlen(p);
|
|
|
|
if (strncmp(str, p, len) || str[len] != '=')
|
|
continue;
|
|
|
|
opt = &qual_options[i];
|
|
str += len + 1;
|
|
break;
|
|
}
|
|
|
|
opt->qualify(str);
|
|
}
|
|
|
|
unsigned int
|
|
qual_flags(const unsigned int scno)
|
|
{
|
|
return (is_number_in_set(scno, &trace_set[current_personality])
|
|
? QUAL_TRACE : 0)
|
|
| (is_number_in_set(scno, &abbrev_set[current_personality])
|
|
? QUAL_ABBREV : 0)
|
|
| (is_number_in_set(scno, &verbose_set[current_personality])
|
|
? QUAL_VERBOSE : 0)
|
|
| (is_number_in_set(scno, &raw_set[current_personality])
|
|
? QUAL_RAW : 0)
|
|
| (is_number_in_set(scno, &inject_set[current_personality])
|
|
? QUAL_INJECT : 0);
|
|
}
|