From: Tom Lane Date: Mon, 17 Feb 2014 16:20:27 +0000 (-0500) Subject: Prevent potential overruns of fixed-size buffers. X-Git-Tag: REL9_2_7~3 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=655b665f745e2e07cf6936c6063b0250f5caa98f;p=postgresql Prevent potential overruns of fixed-size buffers. Coverity identified a number of places in which it couldn't prove that a string being copied into a fixed-size buffer would fit. We believe that most, perhaps all of these are in fact safe, or are copying data that is coming from a trusted source so that any overrun is not really a security issue. Nonetheless it seems prudent to forestall any risk by using strlcpy() and similar functions. Fixes by Peter Eisentraut and Jozef Mlich based on Coverity reports. In addition, fix a potential null-pointer-dereference crash in contrib/chkpass. The crypt(3) function is defined to return NULL on failure, but chkpass.c didn't check for that before using the result. The main practical case in which this could be an issue is if libc is configured to refuse to execute unapproved hashing algorithms (e.g., "FIPS mode"). This ideally should've been a separate commit, but since it touches code adjacent to one of the buffer overrun changes, I included it in this commit to avoid last-minute merge issues. This issue was reported by Honza Horak. Security: CVE-2014-0065 for buffer overruns, CVE-2014-0066 for crypt() --- diff --git a/contrib/chkpass/chkpass.c b/contrib/chkpass/chkpass.c index 0c9fec0e67..1795b8cde4 100644 --- a/contrib/chkpass/chkpass.c +++ b/contrib/chkpass/chkpass.c @@ -70,6 +70,7 @@ chkpass_in(PG_FUNCTION_ARGS) char *str = PG_GETARG_CSTRING(0); chkpass *result; char mysalt[4]; + char *crypt_output; static char salt_chars[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; @@ -92,7 +93,15 @@ chkpass_in(PG_FUNCTION_ARGS) mysalt[1] = salt_chars[random() & 0x3f]; mysalt[2] = 0; /* technically the terminator is not necessary * but I like to play safe */ - strcpy(result->password, crypt(str, mysalt)); + + crypt_output = crypt(str, mysalt); + if (crypt_output == NULL) + ereport(ERROR, + (errcode(ERRCODE_INVALID_PARAMETER_VALUE), + errmsg("crypt() failed"))); + + strlcpy(result->password, crypt_output, sizeof(result->password)); + PG_RETURN_POINTER(result); } @@ -141,9 +150,16 @@ chkpass_eq(PG_FUNCTION_ARGS) chkpass *a1 = (chkpass *) PG_GETARG_POINTER(0); text *a2 = PG_GETARG_TEXT_PP(1); char str[9]; + char *crypt_output; text_to_cstring_buffer(a2, str, sizeof(str)); - PG_RETURN_BOOL(strcmp(a1->password, crypt(str, a1->password)) == 0); + crypt_output = crypt(str, a1->password); + if (crypt_output == NULL) + ereport(ERROR, + (errcode(ERRCODE_INVALID_PARAMETER_VALUE), + errmsg("crypt() failed"))); + + PG_RETURN_BOOL(strcmp(a1->password, crypt_output) == 0); } PG_FUNCTION_INFO_V1(chkpass_ne); @@ -153,7 +169,14 @@ chkpass_ne(PG_FUNCTION_ARGS) chkpass *a1 = (chkpass *) PG_GETARG_POINTER(0); text *a2 = PG_GETARG_TEXT_PP(1); char str[9]; + char *crypt_output; text_to_cstring_buffer(a2, str, sizeof(str)); - PG_RETURN_BOOL(strcmp(a1->password, crypt(str, a1->password)) != 0); + crypt_output = crypt(str, a1->password); + if (crypt_output == NULL) + ereport(ERROR, + (errcode(ERRCODE_INVALID_PARAMETER_VALUE), + errmsg("crypt() failed"))); + + PG_RETURN_BOOL(strcmp(a1->password, crypt_output) != 0); } diff --git a/contrib/pg_standby/pg_standby.c b/contrib/pg_standby/pg_standby.c index 84941ede13..0f1e0c1dfc 100644 --- a/contrib/pg_standby/pg_standby.c +++ b/contrib/pg_standby/pg_standby.c @@ -338,7 +338,7 @@ SetWALFileNameForCleanup(void) if (strcmp(restartWALFileName, nextWALFileName) > 0) return false; - strcpy(exclusiveCleanupFileName, restartWALFileName); + strlcpy(exclusiveCleanupFileName, restartWALFileName, sizeof(exclusiveCleanupFileName)); return true; } diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index d639c4ac43..49bb4538c9 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -3017,7 +3017,7 @@ KeepFileRestoredFromArchive(char *path, char *xlogfname) xlogfpath, oldpath))); } #else - strncpy(oldpath, xlogfpath, MAXPGPATH); + strlcpy(oldpath, xlogfpath, MAXPGPATH); #endif if (unlink(oldpath) != 0) ereport(FATAL, @@ -5913,7 +5913,7 @@ recoveryStopsHere(XLogRecord *record, bool *includeThis) recordRestorePointData = (xl_restore_point *) XLogRecGetData(record); recordXtime = recordRestorePointData->rp_time; - strncpy(recordRPName, recordRestorePointData->rp_name, MAXFNAMELEN); + strlcpy(recordRPName, recordRestorePointData->rp_name, MAXFNAMELEN); } else return false; @@ -6008,7 +6008,7 @@ recoveryStopsHere(XLogRecord *record, bool *includeThis) } else { - strncpy(recoveryStopName, recordRPName, MAXFNAMELEN); + strlcpy(recoveryStopName, recordRPName, MAXFNAMELEN); ereport(LOG, (errmsg("recovery stopping at restore point \"%s\", time %s", @@ -6348,7 +6348,7 @@ StartupXLOG(void) * see them */ XLogCtl->RecoveryTargetTLI = recoveryTargetTLI; - strncpy(XLogCtl->archiveCleanupCommand, + strlcpy(XLogCtl->archiveCleanupCommand, archiveCleanupCommand ? archiveCleanupCommand : "", sizeof(XLogCtl->archiveCleanupCommand)); @@ -8760,7 +8760,7 @@ XLogRestorePoint(const char *rpName) xl_restore_point xlrec; xlrec.rp_time = GetCurrentTimestamp(); - strncpy(xlrec.rp_name, rpName, MAXFNAMELEN); + strlcpy(xlrec.rp_name, rpName, MAXFNAMELEN); rdata.buffer = InvalidBuffer; rdata.data = (char *) &xlrec; diff --git a/src/backend/tsearch/spell.c b/src/backend/tsearch/spell.c index 449aa6a0a5..4acc33eac3 100644 --- a/src/backend/tsearch/spell.c +++ b/src/backend/tsearch/spell.c @@ -255,7 +255,7 @@ NIAddSpell(IspellDict *Conf, const char *word, const char *flag) } Conf->Spell[Conf->nspell] = (SPELL *) tmpalloc(SPELLHDRSZ + strlen(word) + 1); strcpy(Conf->Spell[Conf->nspell]->word, word); - strncpy(Conf->Spell[Conf->nspell]->p.flag, flag, MAXFLAGLEN); + strlcpy(Conf->Spell[Conf->nspell]->p.flag, flag, MAXFLAGLEN); Conf->nspell++; } diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c index 4763a6fe58..4105f175f9 100644 --- a/src/backend/utils/adt/datetime.c +++ b/src/backend/utils/adt/datetime.c @@ -90,10 +90,10 @@ char *days[] = {"Sunday", "Monday", "Tuesday", "Wednesday", * Note that this table must be strictly alphabetically ordered to allow an * O(ln(N)) search algorithm to be used. * - * The text field is NOT guaranteed to be NULL-terminated. + * The token field is NOT guaranteed to be NULL-terminated. * - * To keep this table reasonably small, we divide the lexval for TZ and DTZ - * entries by 15 (so they are on 15 minute boundaries) and truncate the text + * To keep this table reasonably small, we divide the value for TZ and DTZ + * entries by 15 (so they are on 15 minute boundaries) and truncate the token * field at TOKMAXLEN characters. * Formerly, we divided by 10 rather than 15 but there are a few time zones * which are 30 or 45 minutes away from an even hour, most are on an hour @@ -108,7 +108,7 @@ static datetkn *timezonetktbl = NULL; static int sztimezonetktbl = 0; static const datetkn datetktbl[] = { -/* text, token, lexval */ + /* token, type, value */ {EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */ {DA_D, ADBC, AD}, /* "ad" for years > 0 */ {"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */ @@ -188,7 +188,7 @@ static const datetkn datetktbl[] = { static int szdatetktbl = sizeof datetktbl / sizeof datetktbl[0]; static datetkn deltatktbl[] = { - /* text, token, lexval */ + /* token, type, value */ {"@", IGNORE_DTF, 0}, /* postgres relative prefix */ {DAGO, AGO, 0}, /* "ago" indicates negative time offset */ {"c", UNITS, DTK_CENTURY}, /* "century" relative */ @@ -4201,6 +4201,7 @@ ConvertTimeZoneAbbrevs(TimeZoneAbbrevTable *tbl, tbl->numabbrevs = n; for (i = 0; i < n; i++) { + /* do NOT use strlcpy here; token field need not be null-terminated */ strncpy(newtbl[i].token, abbrevs[i].abbrev, TOKMAXLEN); newtbl[i].type = abbrevs[i].is_dst ? DTZ : TZ; TOVAL(&newtbl[i], abbrevs[i].offset / MINS_PER_HOUR); diff --git a/src/bin/initdb/findtimezone.c b/src/bin/initdb/findtimezone.c index 6d6f96add0..6d381515e1 100644 --- a/src/bin/initdb/findtimezone.c +++ b/src/bin/initdb/findtimezone.c @@ -68,7 +68,7 @@ pg_open_tzfile(const char *name, char *canonname) if (canonname) strlcpy(canonname, name, TZ_STRLEN_MAX + 1); - strcpy(fullname, pg_TZDIR()); + strlcpy(fullname, pg_TZDIR(), sizeof(fullname)); if (strlen(fullname) + 1 + strlen(name) >= MAXPGPATH) return -1; /* not gonna fit */ strcat(fullname, "/"); @@ -375,7 +375,7 @@ identify_system_timezone(void) } /* Search for the best-matching timezone file */ - strcpy(tmptzdir, pg_TZDIR()); + strlcpy(tmptzdir, pg_TZDIR(), sizeof(tmptzdir)); bestscore = -1; resultbuf[0] = '\0'; scan_available_timezones(tmptzdir, tmptzdir + strlen(tmptzdir) + 1, diff --git a/src/bin/pg_basebackup/pg_basebackup.c b/src/bin/pg_basebackup/pg_basebackup.c index 9d840a15fa..26cc75897a 100644 --- a/src/bin/pg_basebackup/pg_basebackup.c +++ b/src/bin/pg_basebackup/pg_basebackup.c @@ -735,9 +735,9 @@ ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum) FILE *file = NULL; if (PQgetisnull(res, rownum, 0)) - strcpy(current_path, basedir); + strlcpy(current_path, basedir, sizeof(current_path)); else - strcpy(current_path, PQgetvalue(res, rownum, 1)); + strlcpy(current_path, PQgetvalue(res, rownum, 1), sizeof(current_path)); /* * Get the COPY data @@ -1053,7 +1053,7 @@ BaseBackup(void) progname); disconnect_and_exit(1); } - strcpy(xlogstart, PQgetvalue(res, 0, 0)); + strlcpy(xlogstart, PQgetvalue(res, 0, 0), sizeof(xlogstart)); if (verbose && includewal) fprintf(stderr, "transaction log start point: %s\n", xlogstart); PQclear(res); @@ -1153,7 +1153,7 @@ BaseBackup(void) progname); disconnect_and_exit(1); } - strcpy(xlogend, PQgetvalue(res, 0, 0)); + strlcpy(xlogend, PQgetvalue(res, 0, 0), sizeof(xlogend)); if (verbose && includewal) fprintf(stderr, "transaction log end point: %s\n", xlogend); PQclear(res); diff --git a/src/interfaces/ecpg/preproc/pgc.l b/src/interfaces/ecpg/preproc/pgc.l index f2e7eddf86..7ae8556127 100644 --- a/src/interfaces/ecpg/preproc/pgc.l +++ b/src/interfaces/ecpg/preproc/pgc.l @@ -1315,7 +1315,7 @@ parse_include(void) yytext[i] = '\0'; memmove(yytext, yytext+1, strlen(yytext)); - strncpy(inc_file, yytext, sizeof(inc_file)); + strlcpy(inc_file, yytext, sizeof(inc_file)); yyin = fopen(inc_file, "r"); if (!yyin) { diff --git a/src/interfaces/libpq/fe-protocol2.c b/src/interfaces/libpq/fe-protocol2.c index 1ba5885cd3..af4c41293a 100644 --- a/src/interfaces/libpq/fe-protocol2.c +++ b/src/interfaces/libpq/fe-protocol2.c @@ -500,7 +500,7 @@ pqParseInput2(PGconn *conn) if (!conn->result) return; } - strncpy(conn->result->cmdStatus, conn->workBuffer.data, + strlcpy(conn->result->cmdStatus, conn->workBuffer.data, CMDSTATUS_LEN); checkXactStatus(conn, conn->workBuffer.data); conn->asyncStatus = PGASYNC_READY; diff --git a/src/interfaces/libpq/fe-protocol3.c b/src/interfaces/libpq/fe-protocol3.c index d289f82285..6f8a470370 100644 --- a/src/interfaces/libpq/fe-protocol3.c +++ b/src/interfaces/libpq/fe-protocol3.c @@ -206,7 +206,7 @@ pqParseInput3(PGconn *conn) if (!conn->result) return; } - strncpy(conn->result->cmdStatus, conn->workBuffer.data, + strlcpy(conn->result->cmdStatus, conn->workBuffer.data, CMDSTATUS_LEN); conn->asyncStatus = PGASYNC_READY; break; diff --git a/src/port/exec.c b/src/port/exec.c index c79e8ba35e..0726dbe850 100644 --- a/src/port/exec.c +++ b/src/port/exec.c @@ -66,7 +66,7 @@ validate_exec(const char *path) if (strlen(path) >= strlen(".exe") && pg_strcasecmp(path + strlen(path) - strlen(".exe"), ".exe") != 0) { - strcpy(path_exe, path); + strlcpy(path_exe, path, sizeof(path_exe) - 4); strcat(path_exe, ".exe"); path = path_exe; } @@ -275,7 +275,7 @@ resolve_symlinks(char *path) } /* must copy final component out of 'path' temporarily */ - strcpy(link_buf, fname); + strlcpy(link_buf, fname, sizeof(link_buf)); if (!getcwd(path, MAXPGPATH)) { diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c index d991a5ccc7..a6466ebddf 100644 --- a/src/test/regress/pg_regress.c +++ b/src/test/regress/pg_regress.c @@ -1233,7 +1233,7 @@ results_differ(const char *testname, const char *resultsfile, const char *defaul */ platform_expectfile = get_expectfile(testname, resultsfile); - strcpy(expectfile, default_expectfile); + strlcpy(expectfile, default_expectfile, sizeof(expectfile)); if (platform_expectfile) { /* @@ -1288,7 +1288,7 @@ results_differ(const char *testname, const char *resultsfile, const char *defaul { /* This diff was a better match than the last one */ best_line_count = l; - strcpy(best_expect_file, alt_expectfile); + strlcpy(best_expect_file, alt_expectfile, sizeof(best_expect_file)); } free(alt_expectfile); } @@ -1316,7 +1316,7 @@ results_differ(const char *testname, const char *resultsfile, const char *defaul { /* This diff was a better match than the last one */ best_line_count = l; - strcpy(best_expect_file, default_expectfile); + strlcpy(best_expect_file, default_expectfile, sizeof(best_expect_file)); } } diff --git a/src/timezone/pgtz.c b/src/timezone/pgtz.c index d5bc83ecf8..80c5635018 100644 --- a/src/timezone/pgtz.c +++ b/src/timezone/pgtz.c @@ -83,7 +83,7 @@ pg_open_tzfile(const char *name, char *canonname) * Loop to split the given name into directory levels; for each level, * search using scan_directory_ci(). */ - strcpy(fullname, pg_TZDIR()); + strlcpy(fullname, pg_TZDIR(), sizeof(fullname)); orignamelen = fullnamelen = strlen(fullname); fname = name; for (;;)