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Acquire ControlFileLock in relevant SQL functions. 

Commit dc7d70ea added functions that read the control file, but didn't
acquire ControlFileLock.  With unlucky timing, file systems that have
weak interlocking like ext4 and ntfs could expose partially overwritten
contents, and the checksum would fail.

Back-patch to all supported releases.

Reviewed-by: David Steele <david@pgmasters.net>
Reviewed-by: Anton A. Melnikov <aamelnikov@inbox.ru>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/20221123014224.xisi44byq3cf5psi%40awork3.anarazel.de
This commit is contained in:
Thomas Munro 2023-10-16 10:43:47 +13:00
parent 2759924f33
commit f1634c9681
1 changed files with 9 additions and 0 deletions
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9
src/backend/utils/misc/pg_controldata.c
View File

@ -23,6 +23,7 @@
#include "common/controldata_utils.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "storage/lwlock.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/timestamp.h"
@ -53,7 +54,9 @@ pg_control_system(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, NULL, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
@ -131,7 +134,9 @@ pg_control_checkpoint(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* Read the control file. */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, NULL, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
@ -235,7 +240,9 @@ pg_control_recovery(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, NULL, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
@ -302,7 +309,9 @@ pg_control_init(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, NULL, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));