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Fix sscanf limits in pg_basebackup and pg_dump

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Make sure that the string parsing is limited by the size of the
destination buffer.

In pg_basebackup the available values sent from the server
is limited to two characters so there was no risk of overflow.

In pg_dump the buffer is bounded by MAXPGPATH, and thus the limit
must be inserted via preprocessor expansion and the buffer increased
by one to account for the terminator. There is no risk of overflow
here, since in this case, the buffer scanned is smaller than the
destination buffer.

Backpatch the pg_basebackup fix to 11 where it was introduced, and
the pg_dump fix all the way down to 9.6.

Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/B14D3D7B-F98C-4E20-9459-C122C67647FB@yesql.se
Backpatch-through: 11 and 9.6
This commit is contained in:
Daniel Gustafsson 2021-10-19 12:59:50 +02:00
parent fdd8857145
commit 1d7641d51a
2 changed files with 3 additions and 3 deletions
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2
src/bin/pg_basebackup/streamutil.c
View File

@ -310,7 +310,7 @@ RetrieveWalSegSize(PGconn *conn)
}
/* fetch xlog value and unit from the result */
if (sscanf(PQgetvalue(res, 0, 0), "%d%s", &xlog_val, xlog_unit) != 2)
if (sscanf(PQgetvalue(res, 0, 0), "%d%2s", &xlog_val, xlog_unit) != 2)
{
pg_log_error("WAL segment size could not be parsed");
PQclear(res);

4
src/bin/pg_dump/pg_backup_directory.c
View File

@ -449,11 +449,11 @@ _LoadBlobs(ArchiveHandle *AH)
/* Read the blobs TOC file line-by-line, and process each blob */
while ((cfgets(ctx->blobsTocFH, line, MAXPGPATH)) != NULL)
{
char fname[MAXPGPATH];
char fname[MAXPGPATH + 1];
char path[MAXPGPATH];
/* Can't overflow because line and fname are the same length. */
if (sscanf(line, "%u %s\n", &oid, fname) != 2)
if (sscanf(line, "%u %" CppAsString2(MAXPGPATH) "s\n", &oid, fname) != 2)
fatal("invalid line in large object TOC file \"%s\": \"%s\"",
fname, line);