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Acquire ControlFileLock in relevant SQL functions.

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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 782be0f712
commit 606be8a35d
1 changed files with 9 additions and 0 deletions
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9
src/backend/utils/misc/pg_controldata.c
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@ -24,6 +24,7 @@
#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"
@ -54,7 +55,9 @@ pg_control_system(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
@ -132,7 +135,9 @@ pg_control_checkpoint(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* Read the control file. */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, &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, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
@ -300,7 +307,9 @@ pg_control_init(PG_FUNCTION_ARGS)
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
LWLockAcquire(ControlFileLock, LW_SHARED);
ControlFile = get_controlfile(DataDir, &crc_ok);
LWLockRelease(ControlFileLock);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));