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//===-- sanitizer_suppressions.cc -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Suppression parsing/matching code.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_suppressions.h"
#include "sanitizer_allocator_internal.h"
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_file.h"
#include "sanitizer_libc.h"
#include "sanitizer_placement_new.h"
namespace __sanitizer {
SuppressionContext::SuppressionContext(const char *suppression_types[],
int suppression_types_num)
: suppression_types_(suppression_types),
suppression_types_num_(suppression_types_num),
can_parse_(true) {
CHECK_LE(suppression_types_num_, kMaxSuppressionTypes);
internal_memset(has_suppression_type_, 0, suppression_types_num_);
}
#if !SANITIZER_FUCHSIA
static bool GetPathAssumingFileIsRelativeToExec(const char *file_path,
/*out*/char *new_file_path,
uptr new_file_path_size) {
InternalScopedString exec(kMaxPathLength);
if (ReadBinaryNameCached(exec.data(), exec.size())) {
const char *file_name_pos = StripModuleName(exec.data());
uptr path_to_exec_len = file_name_pos - exec.data();
internal_strncat(new_file_path, exec.data(),
Min(path_to_exec_len, new_file_path_size - 1));
internal_strncat(new_file_path, file_path,
new_file_path_size - internal_strlen(new_file_path) - 1);
return true;
}
return false;
}
static const char *FindFile(const char *file_path,
/*out*/char *new_file_path,
uptr new_file_path_size) {
// If we cannot find the file, check if its location is relative to
// the location of the executable.
if (!FileExists(file_path) && !IsAbsolutePath(file_path) &&
GetPathAssumingFileIsRelativeToExec(file_path, new_file_path,
new_file_path_size)) {
return new_file_path;
}
return file_path;
}
#else
static const char *FindFile(const char *file_path, char *, uptr) {
return file_path;
}
#endif
void SuppressionContext::ParseFromFile(const char *filename) {
if (filename[0] == '\0')
return;
InternalScopedString new_file_path(kMaxPathLength);
filename = FindFile(filename, new_file_path.data(), new_file_path.size());
// Read the file.
VPrintf(1, "%s: reading suppressions file at %s\n",
SanitizerToolName, filename);
char *file_contents;
uptr buffer_size;
uptr contents_size;
if (!ReadFileToBuffer(filename, &file_contents, &buffer_size,
&contents_size)) {
Printf("%s: failed to read suppressions file '%s'\n", SanitizerToolName,
filename);
Die();
}
Parse(file_contents);
}
bool SuppressionContext::Match(const char *str, const char *type,
Suppression **s) {
can_parse_ = false;
if (!HasSuppressionType(type))
return false;
for (uptr i = 0; i < suppressions_.size(); i++) {
Suppression &cur = suppressions_[i];
if (0 == internal_strcmp(cur.type, type) && TemplateMatch(cur.templ, str)) {
*s = &cur;
return true;
}
}
return false;
}
static const char *StripPrefix(const char *str, const char *prefix) {
while (*str && *str == *prefix) {
str++;
prefix++;
}
if (!*prefix)
return str;
return 0;
}
void SuppressionContext::Parse(const char *str) {
// Context must not mutate once Match has been called.
CHECK(can_parse_);
const char *line = str;
while (line) {
while (line[0] == ' ' || line[0] == '\t')
line++;
const char *end = internal_strchr(line, '\n');
if (end == 0)
end = line + internal_strlen(line);
if (line != end && line[0] != '#') {
const char *end2 = end;
while (line != end2 &&
(end2[-1] == ' ' || end2[-1] == '\t' || end2[-1] == '\r'))
end2--;
int type;
for (type = 0; type < suppression_types_num_; type++) {
const char *next_char = StripPrefix(line, suppression_types_[type]);
if (next_char && *next_char == ':') {
line = ++next_char;
break;
}
}
if (type == suppression_types_num_) {
Printf("%s: failed to parse suppressions\n", SanitizerToolName);
Die();
}
Suppression s;
s.type = suppression_types_[type];
s.templ = (char*)InternalAlloc(end2 - line + 1);
internal_memcpy(s.templ, line, end2 - line);
s.templ[end2 - line] = 0;
suppressions_.push_back(s);
has_suppression_type_[type] = true;
}
if (end[0] == 0)
break;
line = end + 1;
}
}
uptr SuppressionContext::SuppressionCount() const {
return suppressions_.size();
}
bool SuppressionContext::HasSuppressionType(const char *type) const {
for (int i = 0; i < suppression_types_num_; i++) {
if (0 == internal_strcmp(type, suppression_types_[i]))
return has_suppression_type_[i];
}
return false;
}
const Suppression *SuppressionContext::SuppressionAt(uptr i) const {
CHECK_LT(i, suppressions_.size());
return &suppressions_[i];
}
void SuppressionContext::GetMatched(
InternalMmapVector<Suppression *> *matched) {
for (uptr i = 0; i < suppressions_.size(); i++)
if (atomic_load_relaxed(&suppressions_[i].hit_count))
matched->push_back(&suppressions_[i]);
}
} // namespace __sanitizer
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