/* * Copyright (c) 1991, 1992 Paul Kranenburg * Copyright (c) 1993 Branko Lankester * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey * Copyright (c) 1996-1999 Wichert Akkerman * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation * Linux for s390 port by D.J. Barrow * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "defs.h" #include #include #include #ifdef HAVE_SYS_XATTR_H # include #endif #include #include "regs.h" #include "ptrace.h" int string_to_uint(const char *str) { char *error; long value; if (!*str) return -1; errno = 0; value = strtol(str, &error, 10); if (errno || *error || value < 0 || (long)(int)value != value) return -1; return (int)value; } int tv_nz(const struct timeval *a) { return a->tv_sec || a->tv_usec; } int tv_cmp(const struct timeval *a, const struct timeval *b) { if (a->tv_sec < b->tv_sec || (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) return -1; if (a->tv_sec > b->tv_sec || (a->tv_sec == b->tv_sec && a->tv_usec > b->tv_usec)) return 1; return 0; } double tv_float(const struct timeval *tv) { return tv->tv_sec + tv->tv_usec/1000000.0; } void tv_add(struct timeval *tv, const struct timeval *a, const struct timeval *b) { tv->tv_sec = a->tv_sec + b->tv_sec; tv->tv_usec = a->tv_usec + b->tv_usec; if (tv->tv_usec >= 1000000) { tv->tv_sec++; tv->tv_usec -= 1000000; } } void tv_sub(struct timeval *tv, const struct timeval *a, const struct timeval *b) { tv->tv_sec = a->tv_sec - b->tv_sec; tv->tv_usec = a->tv_usec - b->tv_usec; if (((long) tv->tv_usec) < 0) { tv->tv_sec--; tv->tv_usec += 1000000; } } void tv_div(struct timeval *tv, const struct timeval *a, int n) { tv->tv_usec = (a->tv_sec % n * 1000000 + a->tv_usec + n / 2) / n; tv->tv_sec = a->tv_sec / n + tv->tv_usec / 1000000; tv->tv_usec %= 1000000; } void tv_mul(struct timeval *tv, const struct timeval *a, int n) { tv->tv_usec = a->tv_usec * n; tv->tv_sec = a->tv_sec * n + tv->tv_usec / 1000000; tv->tv_usec %= 1000000; } const char * xlookup(const struct xlat *xlat, const unsigned int val) { for (; xlat->str != NULL; xlat++) if (xlat->val == val) return xlat->str; return NULL; } static int xlat_bsearch_compare(const void *a, const void *b) { const unsigned int val1 = (const unsigned long) a; const unsigned int val2 = ((const struct xlat *) b)->val; return (val1 > val2) ? 1 : (val1 < val2) ? -1 : 0; } const char * xlat_search(const struct xlat *xlat, const size_t nmemb, const unsigned int val) { const struct xlat *e = bsearch((const void*) (const unsigned long) val, xlat, nmemb, sizeof(*xlat), xlat_bsearch_compare); return e ? e->str : NULL; } #if !defined HAVE_STPCPY char * stpcpy(char *dst, const char *src) { while ((*dst = *src++) != '\0') dst++; return dst; } #endif /* Find a next bit which is set. * Starts testing at cur_bit. * Returns -1 if no more bits are set. * * We never touch bytes we don't need to. * On big-endian, array is assumed to consist of * current_wordsize wide words: for example, is current_wordsize is 4, * the bytes are walked in 3,2,1,0, 7,6,5,4, 11,10,9,8 ... sequence. * On little-endian machines, word size is immaterial. */ int next_set_bit(const void *bit_array, unsigned cur_bit, unsigned size_bits) { const unsigned endian = 1; int little_endian = *(char*)&endian; const uint8_t *array = bit_array; unsigned pos = cur_bit / 8; unsigned pos_xor_mask = little_endian ? 0 : current_wordsize-1; for (;;) { uint8_t bitmask; uint8_t cur_byte; if (cur_bit >= size_bits) return -1; cur_byte = array[pos ^ pos_xor_mask]; if (cur_byte == 0) { cur_bit = (cur_bit + 8) & (-8); pos++; continue; } bitmask = 1 << (cur_bit & 7); for (;;) { if (cur_byte & bitmask) return cur_bit; cur_bit++; if (cur_bit >= size_bits) return -1; bitmask <<= 1; /* This check *can't be* optimized out: */ if (bitmask == 0) break; } pos++; } } /* * Print entry in struct xlat table, if there. */ void printxvals(const unsigned int val, const char *dflt, const struct xlat *xlat, ...) { va_list args; va_start(args, xlat); for (; xlat; xlat = va_arg(args, const struct xlat *)) { const char *str = xlookup(xlat, val); if (str) { tprints(str); va_end(args); return; } } /* No hits -- print raw # instead. */ tprintf("%#x /* %s */", val, dflt); va_end(args); } /* * Fetch 64bit argument at position arg_no and * return the index of the next argument. */ int getllval(struct tcb *tcp, unsigned long long *val, int arg_no) { #if SIZEOF_LONG > 4 && SIZEOF_LONG == SIZEOF_LONG_LONG # if SUPPORTED_PERSONALITIES > 1 # ifdef X86_64 if (current_personality != 1) { # else if (current_wordsize > 4) { # endif # endif *val = tcp->u_arg[arg_no]; arg_no++; # if SUPPORTED_PERSONALITIES > 1 } else { # if defined(AARCH64) || defined(POWERPC64) /* Align arg_no to the next even number. */ arg_no = (arg_no + 1) & 0xe; # endif /* AARCH64 || POWERPC64 */ *val = LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]); arg_no += 2; } # endif /* SUPPORTED_PERSONALITIES > 1 */ #elif SIZEOF_LONG > 4 # error Unsupported configuration: SIZEOF_LONG > 4 && SIZEOF_LONG_LONG > SIZEOF_LONG #elif defined LINUX_MIPSN32 *val = tcp->ext_arg[arg_no]; arg_no++; #elif defined X32 if (current_personality == 0) { *val = tcp->ext_arg[arg_no]; arg_no++; } else { *val = LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]); arg_no += 2; } #else # if defined __ARM_EABI__ || \ defined LINUX_MIPSO32 || \ defined POWERPC || \ defined XTENSA /* Align arg_no to the next even number. */ arg_no = (arg_no + 1) & 0xe; # endif *val = LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]); arg_no += 2; #endif return arg_no; } /* * Print 64bit argument at position arg_no and * return the index of the next argument. */ int printllval(struct tcb *tcp, const char *format, int arg_no) { unsigned long long val = 0; arg_no = getllval(tcp, &val, arg_no); tprintf(format, val); return arg_no; } /* * Interpret `xlat' as an array of flags * print the entries whose bits are on in `flags' * return # of flags printed. */ void addflags(const struct xlat *xlat, int flags) { for (; xlat->str; xlat++) { if (xlat->val && (flags & xlat->val) == xlat->val) { tprintf("|%s", xlat->str); flags &= ~xlat->val; } } if (flags) { tprintf("|%#x", flags); } } /* * Interpret `xlat' as an array of flags. * Print to static string the entries whose bits are on in `flags' * Return static string. */ const char * sprintflags(const char *prefix, const struct xlat *xlat, int flags) { static char outstr[1024]; char *outptr; int found = 0; outptr = stpcpy(outstr, prefix); if (flags == 0 && xlat->val == 0 && xlat->str) { strcpy(outptr, xlat->str); return outstr; } for (; xlat->str; xlat++) { if (xlat->val && (flags & xlat->val) == xlat->val) { if (found) *outptr++ = '|'; outptr = stpcpy(outptr, xlat->str); found = 1; flags &= ~xlat->val; if (!flags) break; } } if (flags) { if (found) *outptr++ = '|'; outptr += sprintf(outptr, "%#x", flags); } return outstr; } int printflags(const struct xlat *xlat, int flags, const char *dflt) { int n; const char *sep; if (flags == 0 && xlat->val == 0 && xlat->str) { tprints(xlat->str); return 1; } sep = ""; for (n = 0; xlat->str; xlat++) { if (xlat->val && (flags & xlat->val) == xlat->val) { tprintf("%s%s", sep, xlat->str); flags &= ~xlat->val; sep = "|"; n++; } } if (n) { if (flags) { tprintf("%s%#x", sep, flags); n++; } } else { if (flags) { tprintf("%#x", flags); if (dflt) tprintf(" /* %s */", dflt); } else { if (dflt) tprints("0"); } } return n; } void printaddr(const long addr) { if (!addr) tprints("NULL"); else tprintf("%#lx", addr); } #define DEF_PRINTNUM(name, type) \ bool \ printnum_ ## name(struct tcb *tcp, const long addr, const char *fmt) \ { \ type num; \ if (umove_or_printaddr(tcp, addr, &num)) \ return false; \ tprints("["); \ tprintf(fmt, num); \ tprints("]"); \ return true; \ } #define DEF_PRINTPAIR(name, type) \ bool \ printpair_ ## name(struct tcb *tcp, const long addr, const char *fmt) \ { \ type pair[2]; \ if (umove_or_printaddr(tcp, addr, &pair)) \ return false; \ tprints("["); \ tprintf(fmt, pair[0]); \ tprints(", "); \ tprintf(fmt, pair[1]); \ tprints("]"); \ return true; \ } DEF_PRINTNUM(int, int) DEF_PRINTPAIR(int, int) DEF_PRINTNUM(short, short) DEF_PRINTNUM(int64, uint64_t) DEF_PRINTPAIR(int64, uint64_t) #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 bool printnum_long_int(struct tcb *tcp, const long addr, const char *fmt_long, const char *fmt_int) { if (current_wordsize > sizeof(int)) { return printnum_int64(tcp, addr, fmt_long); } else { return printnum_int(tcp, addr, fmt_int); } } #endif const char * sprinttime(time_t t) { struct tm *tmp; static char buf[sizeof(int) * 3 * 6]; if (t == 0) { strcpy(buf, "0"); return buf; } tmp = localtime(&t); if (tmp) snprintf(buf, sizeof buf, "%02d/%02d/%02d-%02d:%02d:%02d", tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); else snprintf(buf, sizeof buf, "%lu", (unsigned long) t); return buf; } static char * getfdproto(struct tcb *tcp, int fd, char *buf, unsigned bufsize) { #ifdef HAVE_SYS_XATTR_H ssize_t r; char path[sizeof("/proc/%u/fd/%u") + 2 * sizeof(int)*3]; if (fd < 0) return NULL; sprintf(path, "/proc/%u/fd/%u", tcp->pid, fd); r = getxattr(path, "system.sockprotoname", buf, bufsize - 1); if (r <= 0) return NULL; else { /* * This is a protection for the case when the kernel * side does not append a null byte to the buffer. */ buf[r] = '\0'; return buf; } #else return NULL; #endif } void printfd(struct tcb *tcp, int fd) { char path[PATH_MAX + 1]; if (show_fd_path && getfdpath(tcp, fd, path, sizeof(path)) >= 0) { static const char socket_prefix[] = "socket:["; const size_t socket_prefix_len = sizeof(socket_prefix) - 1; const size_t path_len = strlen(path); tprintf("%d<", fd); if (show_fd_path > 1 && strncmp(path, socket_prefix, socket_prefix_len) == 0 && path[path_len - 1] == ']') { unsigned long inodenr; #define PROTO_NAME_LEN 32 char proto_buf[PROTO_NAME_LEN]; const char *proto = getfdproto(tcp, fd, proto_buf, PROTO_NAME_LEN); inodenr = strtoul(path + socket_prefix_len, NULL, 10); if (!print_sockaddr_by_inode(inodenr, proto)) { if (proto) tprintf("%s:[%lu]", proto, inodenr); else tprints(path); } } else { print_quoted_string(path, path_len, QUOTE_OMIT_LEADING_TRAILING_QUOTES); } tprints(">"); } else tprintf("%d", fd); } /* * Quote string `instr' of length `size' * Write up to (3 + `size' * 4) bytes to `outstr' buffer. * * If QUOTE_0_TERMINATED `style' flag is set, * treat `instr' as a NUL-terminated string, * checking up to (`size' + 1) bytes of `instr'. * * If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set, * do not add leading and trailing quoting symbols. * * Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise. * Note that if QUOTE_0_TERMINATED is not set, always returns 1. */ static int string_quote(const char *instr, char *outstr, const unsigned int size, const unsigned int style) { const unsigned char *ustr = (const unsigned char *) instr; char *s = outstr; unsigned int i; int usehex, c, eol; if (style & QUOTE_0_TERMINATED) eol = '\0'; else eol = 0x100; /* this can never match a char */ usehex = 0; if (xflag > 1) usehex = 1; else if (xflag) { /* Check for presence of symbol which require to hex-quote the whole string. */ for (i = 0; i < size; ++i) { c = ustr[i]; /* Check for NUL-terminated string. */ if (c == eol) break; /* Force hex unless c is printable or whitespace */ if (c > 0x7e) { usehex = 1; break; } /* In ASCII isspace is only these chars: "\t\n\v\f\r". * They happen to have ASCII codes 9,10,11,12,13. */ if (c < ' ' && (unsigned)(c - 9) >= 5) { usehex = 1; break; } } } if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES)) *s++ = '\"'; if (usehex) { /* Hex-quote the whole string. */ for (i = 0; i < size; ++i) { c = ustr[i]; /* Check for NUL-terminated string. */ if (c == eol) goto asciz_ended; *s++ = '\\'; *s++ = 'x'; *s++ = "0123456789abcdef"[c >> 4]; *s++ = "0123456789abcdef"[c & 0xf]; } } else { for (i = 0; i < size; ++i) { c = ustr[i]; /* Check for NUL-terminated string. */ if (c == eol) goto asciz_ended; switch (c) { case '\"': case '\\': *s++ = '\\'; *s++ = c; break; case '\f': *s++ = '\\'; *s++ = 'f'; break; case '\n': *s++ = '\\'; *s++ = 'n'; break; case '\r': *s++ = '\\'; *s++ = 'r'; break; case '\t': *s++ = '\\'; *s++ = 't'; break; case '\v': *s++ = '\\'; *s++ = 'v'; break; default: if (c >= ' ' && c <= 0x7e) *s++ = c; else { /* Print \octal */ *s++ = '\\'; if (i + 1 < size && ustr[i + 1] >= '0' && ustr[i + 1] <= '9' ) { /* Print \ooo */ *s++ = '0' + (c >> 6); *s++ = '0' + ((c >> 3) & 0x7); } else { /* Print \[[o]o]o */ if ((c >> 3) != 0) { if ((c >> 6) != 0) *s++ = '0' + (c >> 6); *s++ = '0' + ((c >> 3) & 0x7); } } *s++ = '0' + (c & 0x7); } break; } } } if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES)) *s++ = '\"'; *s = '\0'; /* Return zero if we printed entire ASCIZ string (didn't truncate it) */ if (style & QUOTE_0_TERMINATED && ustr[i] == '\0') { /* We didn't see NUL yet (otherwise we'd jump to 'asciz_ended') * but next char is NUL. */ return 0; } return 1; asciz_ended: if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES)) *s++ = '\"'; *s = '\0'; /* Return zero: we printed entire ASCIZ string (didn't truncate it) */ return 0; } #ifndef ALLOCA_CUTOFF # define ALLOCA_CUTOFF 4032 #endif #define use_alloca(n) ((n) <= ALLOCA_CUTOFF) /* * Quote string `str' of length `size' and print the result. * * If QUOTE_0_TERMINATED `style' flag is set, * treat `str' as a NUL-terminated string and * quote at most (`size' - 1) bytes. * * If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set, * do not add leading and trailing quoting symbols. * * Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise. * Note that if QUOTE_0_TERMINATED is not set, always returns 1. */ int print_quoted_string(const char *str, unsigned int size, const unsigned int style) { char *buf; char *outstr; unsigned int alloc_size; int rc; if (size && style & QUOTE_0_TERMINATED) --size; alloc_size = 4 * size; if (alloc_size / 4 != size) { error_msg("Out of memory"); tprints("???"); return -1; } alloc_size += 1 + (style & QUOTE_OMIT_LEADING_TRAILING_QUOTES ? 0 : 2); if (use_alloca(alloc_size)) { outstr = alloca(alloc_size); buf = NULL; } else { outstr = buf = malloc(alloc_size); if (!buf) { error_msg("Out of memory"); tprints("???"); return -1; } } rc = string_quote(str, outstr, size, style); tprints(outstr); free(buf); return rc; } /* * Print path string specified by address `addr' and length `n'. * If path length exceeds `n', append `...' to the output. */ void printpathn(struct tcb *tcp, long addr, unsigned int n) { char path[PATH_MAX + 1]; int nul_seen; if (!addr) { tprints("NULL"); return; } /* Cap path length to the path buffer size */ if (n > sizeof path - 1) n = sizeof path - 1; /* Fetch one byte more to find out whether path length > n. */ nul_seen = umovestr(tcp, addr, n + 1, path); if (nul_seen < 0) tprintf("%#lx", addr); else { path[n++] = '\0'; print_quoted_string(path, n, QUOTE_0_TERMINATED); if (!nul_seen) tprints("..."); } } void printpath(struct tcb *tcp, long addr) { /* Size must correspond to char path[] size in printpathn */ printpathn(tcp, addr, PATH_MAX); } /* * Print string specified by address `addr' and length `len'. * If `len' < 0, treat the string as a NUL-terminated string. * If string length exceeds `max_strlen', append `...' to the output. */ void printstr(struct tcb *tcp, long addr, long len) { static char *str = NULL; static char *outstr; unsigned int size; unsigned int style; int ellipsis; if (!addr) { tprints("NULL"); return; } /* Allocate static buffers if they are not allocated yet. */ if (!str) { unsigned int outstr_size = 4 * max_strlen + /*for quotes and NUL:*/ 3; if (outstr_size / 4 != max_strlen) die_out_of_memory(); str = xmalloc(max_strlen + 1); outstr = xmalloc(outstr_size); } size = max_strlen; if (len == -1) { /* * Treat as a NUL-terminated string: fetch one byte more * because string_quote may look one byte ahead. */ if (umovestr(tcp, addr, size + 1, str) < 0) { tprintf("%#lx", addr); return; } style = QUOTE_0_TERMINATED; } else { if (size > (unsigned long)len) size = (unsigned long)len; if (umoven(tcp, addr, size, str) < 0) { tprintf("%#lx", addr); return; } style = 0; } /* If string_quote didn't see NUL and (it was supposed to be ASCIZ str * or we were requested to print more than -s NUM chars)... */ ellipsis = (string_quote(str, outstr, size, style) && (len < 0 || (unsigned long) len > max_strlen)); tprints(outstr); if (ellipsis) tprints("..."); } void dumpiov(struct tcb *tcp, int len, long addr) { #if SUPPORTED_PERSONALITIES > 1 union { struct { u_int32_t base; u_int32_t len; } *iov32; struct { u_int64_t base; u_int64_t len; } *iov64; } iovu; #define iov iovu.iov64 #define sizeof_iov \ (current_wordsize == 4 ? sizeof(*iovu.iov32) : sizeof(*iovu.iov64)) #define iov_iov_base(i) \ (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].base : iovu.iov64[i].base) #define iov_iov_len(i) \ (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].len : iovu.iov64[i].len) #else struct iovec *iov; #define sizeof_iov sizeof(*iov) #define iov_iov_base(i) iov[i].iov_base #define iov_iov_len(i) iov[i].iov_len #endif int i; unsigned size; size = sizeof_iov * len; /* Assuming no sane program has millions of iovs */ if ((unsigned)len > 1024*1024 /* insane or negative size? */ || (iov = malloc(size)) == NULL) { error_msg("Out of memory"); return; } if (umoven(tcp, addr, size, iov) >= 0) { for (i = 0; i < len; i++) { /* include the buffer number to make it easy to * match up the trace with the source */ tprintf(" * %lu bytes in buffer %d\n", (unsigned long)iov_iov_len(i), i); dumpstr(tcp, (long) iov_iov_base(i), iov_iov_len(i)); } } free(iov); #undef sizeof_iov #undef iov_iov_base #undef iov_iov_len #undef iov } void dumpstr(struct tcb *tcp, long addr, int len) { static int strsize = -1; static unsigned char *str; char outbuf[ ( (sizeof( "xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx " "1234567890123456") + /*in case I'm off by few:*/ 4) /*align to 8 to make memset easier:*/ + 7) & -8 ]; const unsigned char *src; int i; memset(outbuf, ' ', sizeof(outbuf)); if (strsize < len + 16) { free(str); str = malloc(len + 16); if (!str) { strsize = -1; error_msg("Out of memory"); return; } strsize = len + 16; } if (umoven(tcp, addr, len, str) < 0) return; /* Space-pad to 16 bytes */ i = len; while (i & 0xf) str[i++] = ' '; i = 0; src = str; while (i < len) { char *dst = outbuf; /* Hex dump */ do { if (i < len) { *dst++ = "0123456789abcdef"[*src >> 4]; *dst++ = "0123456789abcdef"[*src & 0xf]; } else { *dst++ = ' '; *dst++ = ' '; } dst++; /* space is there by memset */ i++; if ((i & 7) == 0) dst++; /* space is there by memset */ src++; } while (i & 0xf); /* ASCII dump */ i -= 16; src -= 16; do { if (*src >= ' ' && *src < 0x7f) *dst++ = *src; else *dst++ = '.'; src++; } while (++i & 0xf); *dst = '\0'; tprintf(" | %05x %s |\n", i - 16, outbuf); } } #ifdef HAVE_PROCESS_VM_READV /* C library supports this, but the kernel might not. */ static bool process_vm_readv_not_supported = 0; #else /* Need to do this since process_vm_readv() is not yet available in libc. * When libc is be updated, only "static bool process_vm_readv_not_supported" * line should remain. */ #if !defined(__NR_process_vm_readv) # if defined(I386) # define __NR_process_vm_readv 347 # elif defined(X86_64) # define __NR_process_vm_readv 310 # elif defined(POWERPC) # define __NR_process_vm_readv 351 # endif #endif #if defined(__NR_process_vm_readv) static bool process_vm_readv_not_supported = 0; /* Have to avoid duplicating with the C library headers. */ static ssize_t strace_process_vm_readv(pid_t pid, const struct iovec *lvec, unsigned long liovcnt, const struct iovec *rvec, unsigned long riovcnt, unsigned long flags) { return syscall(__NR_process_vm_readv, (long)pid, lvec, liovcnt, rvec, riovcnt, flags); } #define process_vm_readv strace_process_vm_readv #else static bool process_vm_readv_not_supported = 1; # define process_vm_readv(...) (errno = ENOSYS, -1) #endif #endif /* end of hack */ static ssize_t vm_read_mem(pid_t pid, void *laddr, long raddr, size_t len) { const struct iovec local = { .iov_base = laddr, .iov_len = len }; const struct iovec remote = { .iov_base = (void *) raddr, .iov_len = len }; return process_vm_readv(pid, &local, 1, &remote, 1, 0); } /* * move `len' bytes of data from process `pid' * at address `addr' to our space at `our_addr' */ int umoven(struct tcb *tcp, long addr, unsigned int len, void *our_addr) { char *laddr = our_addr; int pid = tcp->pid; unsigned int n, m, nread; union { long val; char x[sizeof(long)]; } u; #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 if (current_wordsize < sizeof(addr)) addr &= (1ul << 8 * current_wordsize) - 1; #endif if (!process_vm_readv_not_supported) { int r = vm_read_mem(pid, laddr, addr, len); if ((unsigned int) r == len) return 0; if (r >= 0) { error_msg("umoven: short read (%u < %u) @0x%lx", (unsigned int) r, len, addr); return -1; } switch (errno) { case ENOSYS: process_vm_readv_not_supported = 1; break; case EPERM: /* operation not permitted, try PTRACE_PEEKDATA */ break; case ESRCH: /* the process is gone */ return -1; case EFAULT: case EIO: /* address space is inaccessible */ return -1; default: /* all the rest is strange and should be reported */ perror_msg("process_vm_readv"); return -1; } } nread = 0; if (addr & (sizeof(long) - 1)) { /* addr not a multiple of sizeof(long) */ n = addr & (sizeof(long) - 1); /* residue */ addr &= -sizeof(long); /* aligned address */ errno = 0; u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0); switch (errno) { case 0: break; case ESRCH: case EINVAL: /* these could be seen if the process is gone */ return -1; case EFAULT: case EIO: case EPERM: /* address space is inaccessible */ return -1; default: /* all the rest is strange and should be reported */ perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr); return -1; } m = MIN(sizeof(long) - n, len); memcpy(laddr, &u.x[n], m); addr += sizeof(long); laddr += m; nread += m; len -= m; } while (len) { errno = 0; u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0); switch (errno) { case 0: break; case ESRCH: case EINVAL: /* these could be seen if the process is gone */ return -1; case EFAULT: case EIO: case EPERM: /* address space is inaccessible */ if (nread) { perror_msg("umoven: short read (%u < %u) @0x%lx", nread, nread + len, addr - nread); } return -1; default: /* all the rest is strange and should be reported */ perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr); return -1; } m = MIN(sizeof(long), len); memcpy(laddr, u.x, m); addr += sizeof(long); laddr += m; nread += m; len -= m; } return 0; } int umoven_or_printaddr(struct tcb *tcp, const long addr, const unsigned int len, void *our_addr) { if (!addr) { tprints("NULL"); return -1; } if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) || umoven(tcp, addr, len, our_addr) < 0) { tprintf("%#lx", addr); return -1; } return 0; } int umove_ulong_or_printaddr(struct tcb *tcp, const long addr, unsigned long *ptr) { if (current_wordsize < sizeof(*ptr)) { uint32_t val32; int r = umove_or_printaddr(tcp, addr, &val32); if (!r) *ptr = (unsigned long) val32; return r; } return umove_or_printaddr(tcp, addr, ptr); } int umove_ulong_array_or_printaddr(struct tcb *tcp, const long addr, unsigned long *ptr, size_t n) { if (current_wordsize < sizeof(*ptr)) { uint32_t ptr32[n]; int r = umove_or_printaddr(tcp, addr, &ptr32); if (!r) { size_t i; for (i = 0; i < n; ++i) ptr[i] = (unsigned long) ptr32[i]; } return r; } return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr); } /* * Like `umove' but make the additional effort of looking * for a terminating zero byte. * * Returns < 0 on error, > 0 if NUL was seen, * (TODO if useful: return count of bytes including NUL), * else 0 if len bytes were read but no NUL byte seen. * * Note: there is no guarantee we won't overwrite some bytes * in laddr[] _after_ terminating NUL (but, of course, * we never write past laddr[len-1]). */ int umovestr(struct tcb *tcp, long addr, unsigned int len, char *laddr) { #if SIZEOF_LONG == 4 const unsigned long x01010101 = 0x01010101ul; const unsigned long x80808080 = 0x80808080ul; #elif SIZEOF_LONG == 8 const unsigned long x01010101 = 0x0101010101010101ul; const unsigned long x80808080 = 0x8080808080808080ul; #else # error SIZEOF_LONG > 8 #endif int pid = tcp->pid; unsigned int n, m, nread; union { unsigned long val; char x[sizeof(long)]; } u; #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 if (current_wordsize < sizeof(addr)) addr &= (1ul << 8 * current_wordsize) - 1; #endif nread = 0; if (!process_vm_readv_not_supported) { const size_t page_size = get_pagesize(); const size_t page_mask = page_size - 1; while (len > 0) { unsigned int chunk_len; unsigned int end_in_page; /* * Don't cross pages, otherwise we can get EFAULT * and fail to notice that terminating NUL lies * in the existing (first) page. */ chunk_len = len > page_size ? page_size : len; end_in_page = (addr + chunk_len) & page_mask; if (chunk_len > end_in_page) /* crosses to the next page */ chunk_len -= end_in_page; int r = vm_read_mem(pid, laddr, addr, chunk_len); if (r > 0) { if (memchr(laddr, '\0', r)) return 1; addr += r; laddr += r; nread += r; len -= r; continue; } switch (errno) { case ENOSYS: process_vm_readv_not_supported = 1; goto vm_readv_didnt_work; case ESRCH: /* the process is gone */ return -1; case EPERM: /* operation not permitted, try PTRACE_PEEKDATA */ if (!nread) goto vm_readv_didnt_work; /* fall through */ case EFAULT: case EIO: /* address space is inaccessible */ if (nread) { perror_msg("umovestr: short read (%d < %d) @0x%lx", nread, nread + len, addr - nread); } return -1; default: /* all the rest is strange and should be reported */ perror_msg("process_vm_readv"); return -1; } } return 0; } vm_readv_didnt_work: if (addr & (sizeof(long) - 1)) { /* addr not a multiple of sizeof(long) */ n = addr & (sizeof(long) - 1); /* residue */ addr &= -sizeof(long); /* aligned address */ errno = 0; u.val = ptrace(PTRACE_PEEKDATA, pid, (char *)addr, 0); switch (errno) { case 0: break; case ESRCH: case EINVAL: /* these could be seen if the process is gone */ return -1; case EFAULT: case EIO: case EPERM: /* address space is inaccessible */ return -1; default: /* all the rest is strange and should be reported */ perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr); return -1; } m = MIN(sizeof(long) - n, len); memcpy(laddr, &u.x[n], m); while (n & (sizeof(long) - 1)) if (u.x[n++] == '\0') return 1; addr += sizeof(long); laddr += m; nread += m; len -= m; } while (len) { errno = 0; u.val = ptrace(PTRACE_PEEKDATA, pid, (char *)addr, 0); switch (errno) { case 0: break; case ESRCH: case EINVAL: /* these could be seen if the process is gone */ return -1; case EFAULT: case EIO: case EPERM: /* address space is inaccessible */ if (nread) { perror_msg("umovestr: short read (%d < %d) @0x%lx", nread, nread + len, addr - nread); } return -1; default: /* all the rest is strange and should be reported */ perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr); return -1; } m = MIN(sizeof(long), len); memcpy(laddr, u.x, m); /* "If a NUL char exists in this word" */ if ((u.val - x01010101) & ~u.val & x80808080) return 1; addr += sizeof(long); laddr += m; nread += m; len -= m; } return 0; } int upeek(int pid, long off, long *res) { long val; errno = 0; val = ptrace(PTRACE_PEEKUSER, (pid_t)pid, (char *) off, 0); if (val == -1 && errno) { if (errno != ESRCH) { perror_msg("upeek: PTRACE_PEEKUSER pid:%d @0x%lx)", pid, off); } return -1; } *res = val; return 0; }