forked from OSchip/llvm-project
Custom wrappers for DFSanitizing sprintf & snprintf.
Differential Revision: http://reviews.llvm.org/D5561 llvm-svn: 219293
This commit is contained in:
Lorenzo Martignoni
parent
58a2461368
commit
60ebffc12f
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@ -12,12 +12,14 @@
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// This file defines the custom functions listed in done_abilist.txt.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#include "sanitizer_common/sanitizer_linux.h"
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#include "dfsan/dfsan.h"
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#include <arpa/inet.h>
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#include <assert.h>
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#include <ctype.h>
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#include <dlfcn.h>
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#include <link.h>
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@ -26,6 +28,8 @@
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#include <pwd.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -839,4 +843,281 @@ __dfsw_write(int fd, const void *buf, size_t count,
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*ret_label = 0;
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return write(fd, buf, count);
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}
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// Type used to extract a dfsan_label with va_arg()
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typedef int dfsan_label_va;
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// A chunk of data representing the output of formatting either a constant
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// string or a single format directive.
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struct Chunk {
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// Address of the beginning of the formatted string
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const char *ptr;
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// Size of the formatted string
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size_t size;
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// Type of DFSan label (depends on the format directive)
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enum {
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// Constant string, no argument and thus no label
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NONE = 0,
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// Label for an argument of '%n'
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IGNORED,
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// Label for a '%s' argument
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STRING,
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// Label for any other type of argument
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NUMERIC,
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} label_type;
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// Value of the argument (if label_type == STRING)
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const char *arg;
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};
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// Formats the input. The output is stored in 'str' starting from offset
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// 'off'. The format directive is represented by the first 'format_size' bytes
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// of 'format'. If 'has_size' is true, 'size' bounds the number of output
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// bytes. Returns the return value of the vsnprintf call used to format the
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// input.
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static int format_chunk(char *str, size_t off, bool has_size, size_t size,
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const char *format, size_t format_size, ...) {
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char *chunk_format = (char *) malloc(format_size + 1);
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assert(chunk_format);
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internal_memcpy(chunk_format, format, format_size);
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chunk_format[format_size] = '\0';
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va_list ap;
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va_start(ap, format_size);
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int r = 0;
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if (has_size) {
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r = vsnprintf(str + off, off < size ? size - off : 0, chunk_format, ap);
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} else {
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r = vsprintf(str + off, chunk_format, ap);
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}
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va_end(ap);
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free(chunk_format);
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return r;
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}
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// Formats the input and propagates the input labels to the output. The output
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// is stored in 'str'. If 'has_size' is true, 'size' bounds the number of
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// output bytes. 'format' and 'ap' are the format string and the list of
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// arguments for formatting. Returns the return value vsnprintf would return.
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//
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// The function tokenizes the format string in chunks representing either a
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// constant string or a single format directive (e.g., '%.3f') and formats each
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// chunk independently into the output string. This approach allows to figure
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// out which bytes of the output string depends on which argument and thus to
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// propagate labels more precisely.
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static int format_buffer(char *str, bool has_size, size_t size,
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const char *format, va_list ap) {
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InternalMmapVector<Chunk> chunks(8);
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size_t off = 0;
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while (*format) {
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chunks.push_back(Chunk());
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Chunk& chunk = chunks.back();
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chunk.ptr = str + off;
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chunk.arg = nullptr;
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int status = 0;
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if (*format != '%') {
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// Ordinary character. Consume all the characters until a '%' or the end
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// of the string.
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size_t format_size = 0;
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for (; *format && *format != '%'; ++format, ++format_size) {}
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status = format_chunk(str, off, has_size, size, format - format_size,
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format_size);
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chunk.label_type = Chunk::NONE;
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} else {
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// Conversion directive. Consume all the characters until a conversion
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// specifier or the end of the string.
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bool end_format = false;
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#define FORMAT_CHUNK(t) \
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format_chunk(str, off, has_size, size, format - format_size, \
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format_size + 1, va_arg(ap, t))
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for (size_t format_size = 1; *++format && !end_format; ++format_size) {
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switch (*format) {
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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switch (*(format - 1)) {
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case 'h':
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// Also covers the 'hh' case (since the size of the arg is still
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// an int).
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status = FORMAT_CHUNK(int);
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break;
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case 'l':
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if (format_size >= 2 && *(format - 2) == 'l') {
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status = FORMAT_CHUNK(long long int);
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} else {
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status = FORMAT_CHUNK(long int);
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}
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break;
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case 'q':
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status = FORMAT_CHUNK(long long int);
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break;
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case 'j':
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status = FORMAT_CHUNK(intmax_t);
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break;
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case 'z':
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status = FORMAT_CHUNK(size_t);
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break;
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case 't':
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status = FORMAT_CHUNK(size_t);
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break;
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default:
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status = FORMAT_CHUNK(int);
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}
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chunk.label_type = Chunk::NUMERIC;
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end_format = true;
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break;
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G':
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if (*(format - 1) == 'L') {
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status = FORMAT_CHUNK(long double);
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} else {
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status = FORMAT_CHUNK(double);
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}
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chunk.label_type = Chunk::NUMERIC;
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end_format = true;
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break;
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case 'c':
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status = FORMAT_CHUNK(int);
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chunk.label_type = Chunk::NUMERIC;
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end_format = true;
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break;
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case 's':
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chunk.arg = va_arg(ap, char *);
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status =
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format_chunk(str, off, has_size, size,
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format - format_size, format_size + 1,
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chunk.arg);
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chunk.label_type = Chunk::STRING;
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end_format = true;
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break;
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case 'p':
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status = FORMAT_CHUNK(void *);
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chunk.label_type = Chunk::NUMERIC;
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end_format = true;
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break;
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case 'n':
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*(va_arg(ap, int *)) = (int)off;
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chunk.label_type = Chunk::IGNORED;
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end_format = true;
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break;
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case '%':
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status = format_chunk(str, off, has_size, size,
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format - format_size, format_size + 1);
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chunk.label_type = Chunk::NONE;
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end_format = true;
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break;
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default:
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break;
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}
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}
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#undef FORMAT_CHUNK
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}
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if (status < 0) {
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return status;
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}
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// A return value of {v,}snprintf of size or more means that the output was
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// truncated.
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if (has_size) {
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if (off < size) {
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size_t ustatus = (size_t) status;
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chunk.size = ustatus >= (size - off) ?
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ustatus - (size - off) : ustatus;
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} else {
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chunk.size = 0;
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}
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} else {
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chunk.size = status;
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}
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off += status;
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}
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// Consume the labels of the output buffer, (optional) size, and format
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// string.
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//
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// TODO(martignlo): Decide how to combine labels (e.g., whether to ignore or
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// not the label of the format string).
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va_arg(ap, dfsan_label_va);
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if (has_size) {
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va_arg(ap, dfsan_label_va);
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}
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va_arg(ap, dfsan_label_va);
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// Label each output chunk according to the label supplied as argument to the
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// function. We need to go through all the chunks and arguments even if the
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// string was only partially printed ({v,}snprintf case).
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for (size_t i = 0; i < chunks.size(); ++i) {
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const Chunk& chunk = chunks[i];
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switch (chunk.label_type) {
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case Chunk::NONE:
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dfsan_set_label(0, (void*) chunk.ptr, chunk.size);
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break;
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case Chunk::IGNORED:
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va_arg(ap, dfsan_label_va);
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dfsan_set_label(0, (void*) chunk.ptr, chunk.size);
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break;
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case Chunk::NUMERIC: {
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dfsan_label label = va_arg(ap, dfsan_label_va);
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dfsan_set_label(label, (void*) chunk.ptr, chunk.size);
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break;
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}
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case Chunk::STRING: {
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// Consume the label of the pointer to the string
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va_arg(ap, dfsan_label_va);
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internal_memcpy(shadow_for((void *) chunk.ptr),
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shadow_for((void *) chunk.arg),
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sizeof(dfsan_label) * (strlen(chunk.arg)));
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break;
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}
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}
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}
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dfsan_label *ret_label_ptr = va_arg(ap, dfsan_label *);
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*ret_label_ptr = 0;
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// Number of bytes written in total.
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return off;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __dfsw_sprintf(char *str, const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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int ret = format_buffer(str, false, 0, format, ap);
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va_end(ap);
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return ret;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __dfsw_snprintf(char *str, size_t size, const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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int ret = format_buffer(str, true, size, format, ap);
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va_end(ap);
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return ret;
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}
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}
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@ -208,9 +208,11 @@ fun:sigemptyset=custom
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fun:sigaction=custom
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fun:gettimeofday=custom
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# sprintf-like
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fun:sprintf=custom
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fun:snprintf=custom
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# TODO: custom
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fun:snprintf=discard
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fun:vsnprintf=discard
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fun:asprintf=discard
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fun:qsort=discard
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@ -1,7 +1,7 @@
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#!/usr/bin/env bash
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DFSAN_DIR=$(dirname "$0")/../
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DFSAN_CUSTOM_TESTS=${DFSAN_DIR}/../../test/dfsan/custom.c
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DFSAN_CUSTOM_TESTS=${DFSAN_DIR}/../../test/dfsan/custom.cc
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DFSAN_CUSTOM_WRAPPERS=${DFSAN_DIR}/dfsan_custom.cc
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DFSAN_ABI_LIST=${DFSAN_DIR}/done_abilist.txt
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@ -29,7 +29,7 @@ TSAN_LIT_TEST_LINT_FILTER=${TSAN_TEST_LINT_FILTER},-whitespace/line_length
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MSAN_RTL_LINT_FILTER=${COMMON_LINT_FILTER}
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LSAN_RTL_LINT_FILTER=${COMMON_LINT_FILTER}
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LSAN_LIT_TEST_LINT_FILTER=${LSAN_RTL_LINT_FILTER},-whitespace/line_length
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DFSAN_RTL_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int,-runtime/printf,-runtime/references
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DFSAN_RTL_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int,-runtime/printf,-runtime/references,-readability/function
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COMMON_RTL_INC_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int,-runtime/sizeof,-runtime/printf,-readability/fn_size
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SANITIZER_INCLUDES_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int
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MKTEMP="mktemp -q /tmp/tmp.XXXXXXXXXX"
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@ -5,7 +5,6 @@
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// Tests custom implementations of various glibc functions.
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#define _GNU_SOURCE
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#include <sanitizer/dfsan_interface.h>
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#include <arpa/inet.h>
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@ -18,6 +17,7 @@
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#include <sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/select.h>
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@ -256,12 +256,12 @@ void test_calloc() {
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// With any luck this sequence of calls will cause calloc to return the same
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// pointer both times. This is probably the best we can do to test this
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// function.
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char *crv = calloc(4096, 1);
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char *crv = (char *) calloc(4096, 1);
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ASSERT_ZERO_LABEL(crv[0]);
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dfsan_set_label(i_label, crv, 100);
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free(crv);
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crv = calloc(4096, 1);
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crv = (char *) calloc(4096, 1);
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ASSERT_ZERO_LABEL(crv[0]);
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free(crv);
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}
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@ -342,14 +342,14 @@ void test_ctime_r() {
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static int write_callback_count = 0;
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static int last_fd;
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static const void *last_buf;
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static const unsigned char *last_buf;
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static size_t last_count;
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void write_callback(int fd, const void *buf, size_t count) {
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write_callback_count++;
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last_fd = fd;
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last_buf = buf;
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last_buf = (const unsigned char*) buf;
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last_count = count;
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}
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@ -376,7 +376,7 @@ void test_dfsan_set_write_callback() {
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dfsan_set_label(i_label, &fd, sizeof(fd));
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dfsan_set_label(j_label, &(buf[3]), 1);
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dfsan_set_label(k_label, &buf_len, sizeof(buf_len));
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res = write(fd, buf, buf_len);
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assert(write_callback_count == 2);
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ASSERT_READ_ZERO_LABEL(&res, sizeof(res));
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@ -694,11 +694,11 @@ void test_memchr() {
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dfsan_set_label(i_label, &str1[3], 1);
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dfsan_set_label(j_label, &str1[4], 1);
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char *crv = memchr(str1, 'r', sizeof(str1));
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char *crv = (char *) memchr(str1, 'r', sizeof(str1));
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assert(crv == &str1[2]);
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ASSERT_ZERO_LABEL(crv);
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crv = memchr(str1, '1', sizeof(str1));
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crv = (char *) memchr(str1, '1', sizeof(str1));
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assert(crv == &str1[3]);
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#ifdef STRICT_DATA_DEPENDENCIES
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ASSERT_ZERO_LABEL(crv);
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@ -706,7 +706,7 @@ void test_memchr() {
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ASSERT_LABEL(crv, i_label);
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#endif
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crv = memchr(str1, 'x', sizeof(str1));
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crv = (char *) memchr(str1, 'x', sizeof(str1));
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assert(!crv);
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#ifdef STRICT_DATA_DEPENDENCIES
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ASSERT_ZERO_LABEL(crv);
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@ -774,6 +774,124 @@ void test_write() {
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close(fd);
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}
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template <class T>
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void test_sprintf_chunk(const char* expected, const char* format, T arg) {
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char buf[512];
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memset(buf, 'a', sizeof(buf));
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char padded_expected[512];
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strcpy(padded_expected, "foo ");
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strcat(padded_expected, expected);
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strcat(padded_expected, " bar");
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char padded_format[512];
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strcpy(padded_format, "foo ");
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strcat(padded_format, format);
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strcat(padded_format, " bar");
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// Non labelled arg.
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assert(sprintf(buf, padded_format, arg) == strlen(padded_expected));
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assert(strcmp(buf, padded_expected) == 0);
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ASSERT_READ_LABEL(buf, strlen(padded_expected), 0);
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memset(buf, 'a', sizeof(buf));
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// Labelled arg.
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dfsan_set_label(i_label, &arg, sizeof(arg));
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assert(sprintf(buf, padded_format, arg) == strlen(padded_expected));
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assert(strcmp(buf, padded_expected) == 0);
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ASSERT_READ_LABEL(buf, 4, 0);
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ASSERT_READ_LABEL(buf + 4, strlen(padded_expected) - 8, i_label);
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ASSERT_READ_LABEL(buf + (strlen(padded_expected) - 4), 4, 0);
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}
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|
||||
void test_sprintf() {
|
||||
char buf[2048];
|
||||
memset(buf, 'a', sizeof(buf));
|
||||
|
||||
// Test formatting (no conversion specifier).
|
||||
assert(sprintf(buf, "Hello world!") == 12);
|
||||
assert(strcmp(buf, "Hello world!") == 0);
|
||||
ASSERT_READ_LABEL(buf, sizeof(buf), 0);
|
||||
|
||||
// Test formatting & label propagation (multiple conversion specifiers): %s,
|
||||
// %d, %n, %f, and %%.
|
||||
const char* s = "world";
|
||||
int m = 8;
|
||||
int d = 27;
|
||||
dfsan_set_label(k_label, (void *) (s + 1), 2);
|
||||
dfsan_set_label(i_label, &m, sizeof(m));
|
||||
dfsan_set_label(j_label, &d, sizeof(d));
|
||||
int n;
|
||||
int r = sprintf(buf, "hello %s, %-d/%d/%d %f %% %n%d", s, 2014, m, d,
|
||||
12345.6781234, &n, 1000);
|
||||
assert(r == 42);
|
||||
assert(strcmp(buf, "hello world, 2014/8/27 12345.678123 % 1000") == 0);
|
||||
ASSERT_READ_LABEL(buf, 7, 0);
|
||||
ASSERT_READ_LABEL(buf + 7, 2, k_label);
|
||||
ASSERT_READ_LABEL(buf + 9, 9, 0);
|
||||
ASSERT_READ_LABEL(buf + 18, 1, i_label);
|
||||
ASSERT_READ_LABEL(buf + 19, 1, 0);
|
||||
ASSERT_READ_LABEL(buf + 20, 2, j_label);
|
||||
ASSERT_READ_LABEL(buf + 22, 15, 0);
|
||||
ASSERT_LABEL(r, 0);
|
||||
assert(n == 38);
|
||||
|
||||
// Test formatting & label propagation (single conversion specifier, with
|
||||
// additional length and precision modifiers).
|
||||
test_sprintf_chunk("-559038737", "%d", 0xdeadbeef);
|
||||
test_sprintf_chunk("3735928559", "%u", 0xdeadbeef);
|
||||
test_sprintf_chunk("12345", "%i", 12345);
|
||||
test_sprintf_chunk("751", "%o", 0751);
|
||||
test_sprintf_chunk("babe", "%x", 0xbabe);
|
||||
test_sprintf_chunk("0000BABE", "%.8X", 0xbabe);
|
||||
test_sprintf_chunk("-17", "%hhd", 0xdeadbeef);
|
||||
test_sprintf_chunk("-16657", "%hd", 0xdeadbeef);
|
||||
test_sprintf_chunk("deadbeefdeadbeef", "%lx", 0xdeadbeefdeadbeef);
|
||||
test_sprintf_chunk("0xdeadbeefdeadbeef", "%p",
|
||||
(void *) 0xdeadbeefdeadbeef);
|
||||
test_sprintf_chunk("18446744073709551615", "%ju", (intmax_t) -1);
|
||||
test_sprintf_chunk("18446744073709551615", "%zu", (size_t) -1);
|
||||
test_sprintf_chunk("18446744073709551615", "%tu", (size_t) -1);
|
||||
|
||||
test_sprintf_chunk("0x1.f9acffa7eb6bfp-4", "%a", 0.123456);
|
||||
test_sprintf_chunk("0X1.F9ACFFA7EB6BFP-4", "%A", 0.123456);
|
||||
test_sprintf_chunk("0.12346", "%.5f", 0.123456);
|
||||
test_sprintf_chunk("0.123456", "%g", 0.123456);
|
||||
test_sprintf_chunk("1.234560e-01", "%e", 0.123456);
|
||||
test_sprintf_chunk("1.234560E-01", "%E", 0.123456);
|
||||
test_sprintf_chunk("0.1234567891234560", "%.16Lf",
|
||||
(long double) 0.123456789123456);
|
||||
|
||||
test_sprintf_chunk("z", "%c", 'z');
|
||||
|
||||
// %n, %s, %d, %f, and %% already tested
|
||||
}
|
||||
|
||||
void test_snprintf() {
|
||||
char buf[2048];
|
||||
memset(buf, 'a', sizeof(buf));
|
||||
dfsan_set_label(0, buf, sizeof(buf));
|
||||
const char* s = "world";
|
||||
int y = 2014;
|
||||
int m = 8;
|
||||
int d = 27;
|
||||
dfsan_set_label(k_label, (void *) (s + 1), 2);
|
||||
dfsan_set_label(i_label, &y, sizeof(y));
|
||||
dfsan_set_label(j_label, &m, sizeof(m));
|
||||
int r = snprintf(buf, 19, "hello %s, %-d/%d/%d %f", s, y, m, d,
|
||||
12345.6781234);
|
||||
// The return value is the number of bytes that would have been written to
|
||||
// the final string if enough space had been available.
|
||||
assert(r == 35);
|
||||
assert(memcmp(buf, "hello world, 2014/", 19) == 0);
|
||||
ASSERT_READ_LABEL(buf, 7, 0);
|
||||
ASSERT_READ_LABEL(buf + 7, 2, k_label);
|
||||
ASSERT_READ_LABEL(buf + 9, 4, 0);
|
||||
ASSERT_READ_LABEL(buf + 13, 4, i_label);
|
||||
ASSERT_READ_LABEL(buf + 17, 2, 0);
|
||||
ASSERT_LABEL(r, 0);
|
||||
}
|
||||
|
||||
int main(void) {
|
||||
i_label = dfsan_create_label("i", 0);
|
||||
j_label = dfsan_create_label("j", 0);
|
||||
|
|
@ -810,7 +928,9 @@ int main(void) {
|
|||
test_select();
|
||||
test_sigaction();
|
||||
test_sigemptyset();
|
||||
test_snprintf();
|
||||
test_socketpair();
|
||||
test_sprintf();
|
||||
test_stat();
|
||||
test_strcasecmp();
|
||||
test_strchr();
|
||||
|
|
@ -31,4 +31,3 @@ config.suffixes = ['.c', '.cc', '.cpp']
|
|||
|
||||
if config.host_os not in ['Linux', 'Darwin']:
|
||||
config.unsupported = True
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue