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import fuchsia: check bounds to handle truncated traces

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the last record might be partially written so it's important to
check bounds and dump the last record if that happens.
This commit is contained in:
Simon Cruanes 2024-01-08 16:02:17 -05:00
parent 747a3cdea2
commit dff6ea5821
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GPG Key ID: EBFFF6F283F3A2B4
1 changed files with 20 additions and 6 deletions
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26
import-fuchsia/src/import-fuchsia.cpp
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@ -3,6 +3,7 @@
#include <cstdint> #include <cstdint>
#include <exception> #include <exception>
#include <ostream> #include <ostream>
#include <utility>
#include <vector> #include <vector>
#ifdef _WIN32 #ifdef _WIN32
#include <windows.h> #include <windows.h>
@ -70,7 +71,6 @@ struct PidTidEncoder {
// A span into the main buffer // A span into the main buffer
struct Record { struct Record {
const uint64_t *p; const uint64_t *p;
;
uint16_t len_word; uint16_t len_word;
uint64_t header; uint64_t header;
}; };
@ -171,13 +171,26 @@ std::vector<uint8_t> read_input(const char *input) {
return buf; return buf;
} }
// read next record starting at `offset` // read next record starting at `offset`. Returns
Record read_next_record(std::vector<uint8_t> const &input, size_t &offset) { // either `(ok, r)` for an in-bound record, or `(false, …)` otherwise.
std::pair<bool, Record> read_next_record(std::vector<uint8_t> const &input, size_t &offset) {
// bound check
#define CHECK_BOUND(n) if ((n) > input.size()) { \
fprintf(stderr, "warning: invalid record at offset %" PRIu64 "\n", offset); \
return std::make_pair(false,Record{}); \
}
CHECK_BOUND(offset+8);
uint64_t header = *((uint64_t *)&input[offset]); uint64_t header = *((uint64_t *)&input[offset]);
uint16_t len_word = (header >> 4) & 0xfff; uint16_t len_word = (header >> 4) & 0xfff;
Record sp{(uint64_t *)&input[offset], len_word, header};
CHECK_BOUND(offset + 8*len_word);
Record r{(uint64_t *)&input[offset], len_word, header};
offset += 8 * len_word; offset += 8 * len_word;
return sp; return std::make_pair(true, r);
} }
// there might be multiple processes so we allocate a pseudo-tid // there might be multiple processes so we allocate a pseudo-tid
@ -398,7 +411,8 @@ int main(int argc, char **argv) {
#define CHECK_INIT() if (!initialized) throw TraceNotInitialized{} #define CHECK_INIT() if (!initialized) throw TraceNotInitialized{}
while (offset < buf.size()) { while (offset < buf.size()) {
Record r = read_next_record(buf, offset); auto [ok, r] = read_next_record(buf, offset);
if (!ok) break;
n_records++; n_records++;
uint8_t ty = r.header & 0xf; uint8_t ty = r.header & 0xf;