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Skip foreign tablespaces when running pg_checksums/pg_verify_checksums

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Attempting to use pg_checksums (pg_verify_checksums in 11) on a data
folder which includes tablespace paths used across multiple major
versions would cause pg_checksums to scan all directories present in
pg_tblspc, and not only marked with TABLESPACE_VERSION_DIRECTORY.  This
could lead to failures when for example running sanity checks on an
upgraded instance with --check.  Even worse, it was possible to rewrite
on-disk pages with --enable for a cluster potentially online.

This commit makes pg_checksums skip any directories not named
TABLESPACE_VERSION_DIRECTORY, similarly to what is done for base
backups.

Reported-by: Michael Banck
Author: Michael Banck, Bernd Helmle
Discussion: https://postgr.es/m/62031974fd8e941dd8351fbc8c7eff60d59c5338.camel@credativ.de
backpatch-through: 11
This commit is contained in:
Michael Paquier 2020-02-27 15:31:27 +09:00
parent 05d8449e73
commit 428a2609ef
2 changed files with 54 additions and 2 deletions
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47
src/bin/pg_checksums/pg_checksums.c
View File

@ -385,7 +385,52 @@ scan_directory(const char *basedir, const char *subdir, bool sizeonly)
#else
else if (S_ISDIR(st.st_mode) || pgwin32_is_junction(fn))
#endif
dirsize += scan_directory(path, de->d_name, sizeonly);
{
/*
* If going through the entries of pg_tblspc, we assume to operate
* on tablespace locations where only TABLESPACE_VERSION_DIRECTORY
* is valid, resolving the linked locations and dive into them
* directly.
*/
if (strncmp("pg_tblspc", subdir, strlen("pg_tblspc")) == 0)
{
char tblspc_path[MAXPGPATH];
struct stat tblspc_st;
/*
* Resolve tablespace location path and check whether
* TABLESPACE_VERSION_DIRECTORY exists. Not finding a valid
* location is unexpected, since there should be no orphaned
* links and no links pointing to something else than a
* directory.
*/
snprintf(tblspc_path, sizeof(tblspc_path), "%s/%s/%s",
path, de->d_name, TABLESPACE_VERSION_DIRECTORY);
if (lstat(tblspc_path, &tblspc_st) < 0)
{
pg_log_error("could not stat file \"%s\": %m",
tblspc_path);
exit(1);
}
/*
* Move backwards once as the scan needs to happen for the
* contents of TABLESPACE_VERSION_DIRECTORY.
*/
snprintf(tblspc_path, sizeof(tblspc_path), "%s/%s",
path, de->d_name);
/* Looks like a valid tablespace location */
dirsize += scan_directory(tblspc_path,
TABLESPACE_VERSION_DIRECTORY,
sizeonly);
}
else
{
dirsize += scan_directory(path, de->d_name, sizeonly);
}
}
}
closedir(dir);
return dirsize;

9
src/bin/pg_checksums/t/002_actions.pl
View File

@ -5,7 +5,7 @@ use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 62;
use Test::More tests => 63;
# Utility routine to create and check a table with corrupted checksums
@ -217,6 +217,13 @@ sub fail_corrupt
# Stop instance for the follow-up checks.
$node->stop;
# Create a fake tablespace location that should not be scanned
# when verifying checksums.
mkdir "$tablespace_dir/PG_99_999999991/";
append_to_file "$tablespace_dir/PG_99_999999991/foo", "123";
command_ok([ 'pg_checksums', '--check', '-D', $pgdata ],
"succeeds with foreign tablespace");
# Authorized relation files filled with corrupted data cause the
# checksum checks to fail. Make sure to use file names different
# than the previous ones.