From 3508ee9c3c2c4e8c0f0f3d20327051f47105da57 Mon Sep 17 00:00:00 2001 From: Noah Misch Date: Sun, 21 Jun 2015 20:04:36 -0400 Subject: [PATCH] Truncate strings in tarCreateHeader() with strlcpy(), not sprintf(). This supplements the GNU libc bug #6530 workarounds introduced in commit 54cd4f04576833abc394e131288bf3dd7dcf4806. On affected systems, a tar-format pg_basebackup failed when some filename beneath the data directory was not valid character data in the postmaster/walsender locale. Back-patch to 9.1, where pg_basebackup was introduced. Extant, bug-prone conversion specifications receive only ASCII bytes or involve low-importance messages. --- src/backend/replication/basebackup.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/backend/replication/basebackup.c b/src/backend/replication/basebackup.c index 200d4d54f84..a0c8903497d 100644 --- a/src/backend/replication/basebackup.c +++ b/src/backend/replication/basebackup.c @@ -988,7 +988,7 @@ _tarWriteHeader(const char *filename, const char *linktarget, memset(h, 0, sizeof(h)); /* Name 100 */ - sprintf(&h[0], "%.99s", filename); + strlcpy(&h[0], filename, 100); if (linktarget != NULL || S_ISDIR(statbuf->st_mode)) { /* @@ -1030,7 +1030,7 @@ _tarWriteHeader(const char *filename, const char *linktarget, /* Type - Symbolic link */ sprintf(&h[156], "2"); /* Link Name 100 */ - sprintf(&h[157], "%.99s", linktarget); + strlcpy(&h[157], linktarget, 100); } else if (S_ISDIR(statbuf->st_mode)) /* Type - directory */ @@ -1047,11 +1047,11 @@ _tarWriteHeader(const char *filename, const char *linktarget, /* User 32 */ /* XXX: Do we need to care about setting correct username? */ - sprintf(&h[265], "%.31s", "postgres"); + strlcpy(&h[265], "postgres", 32); /* Group 32 */ /* XXX: Do we need to care about setting correct group name? */ - sprintf(&h[297], "%.31s", "postgres"); + strlcpy(&h[297], "postgres", 32); /* Major Dev 8 */ sprintf(&h[329], "%07o ", 0); -- 2.47.2