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Prevent integer overflows during units conversion when displaying a GUC

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variable that has units.  Per report from Stefan Kaltenbrunner.

Backport to 8.2.  I also backported my patch of 2007-06-21 that prevented
comparable overflows on the input side, since that now seems to have enough
field track record to be back-patched safely.  That patch included addition
of hints listing the available unit names, which I did not bother to strip
out of it --- this will make a little more work for the translators, but
they can copy the translation from 8.3, and anyway an untranslated hint
is better than no hint.
This commit is contained in:
Tom Lane
2008-07-06 19:48:45 +00:00
parent 2a59b7910e
commit fbcc69c192
1 changed files with 25 additions and 16 deletions
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41
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.461 2008/07/01 21:07:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.462 2008/07/06 19:48:45 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -6266,10 +6266,18 @@ _ShowOption(struct config_generic * record, bool use_units)
val = (*conf->show_hook) ();
else
{
char unit[4];
int result = *conf->variable;
/*
* Use int64 arithmetic to avoid overflows in units
* conversion. If INT64_IS_BUSTED we might overflow
* anyway and print bogus answers, but there are few
* enough such machines that it doesn't seem worth
* trying harder.
*/
int64 result = *conf->variable;
const char *unit;
if (use_units && result > 0 && (record->flags & GUC_UNIT_MEMORY))
if (use_units && result > 0 &&
(record->flags & GUC_UNIT_MEMORY))
{
switch (record->flags & GUC_UNIT_MEMORY)
{
@ -6284,19 +6292,20 @@ _ShowOption(struct config_generic * record, bool use_units)
if (result % KB_PER_GB == 0)
{
result /= KB_PER_GB;
strcpy(unit, "GB");
unit = "GB";
}
else if (result % KB_PER_MB == 0)
{
result /= KB_PER_MB;
strcpy(unit, "MB");
unit = "MB";
}
else
{
strcpy(unit, "kB");
unit = "kB";
}
}
else if (use_units && result > 0 && (record->flags & GUC_UNIT_TIME))
else if (use_units && result > 0 &&
(record->flags & GUC_UNIT_TIME))
{
switch (record->flags & GUC_UNIT_TIME)
{
@ -6311,33 +6320,33 @@ _ShowOption(struct config_generic * record, bool use_units)
if (result % MS_PER_D == 0)
{
result /= MS_PER_D;
strcpy(unit, "d");
unit = "d";
}
else if (result % MS_PER_H == 0)
{
result /= MS_PER_H;
strcpy(unit, "h");
unit = "h";
}
else if (result % MS_PER_MIN == 0)
{
result /= MS_PER_MIN;
strcpy(unit, "min");
unit = "min";
}
else if (result % MS_PER_S == 0)
{
result /= MS_PER_S;
strcpy(unit, "s");
unit = "s";
}
else
{
strcpy(unit, "ms");
unit = "ms";
}
}
else
strcpy(unit, "");
unit = "";
snprintf(buffer, sizeof(buffer), "%d%s",
(int) result, unit);
snprintf(buffer, sizeof(buffer), INT64_FORMAT "%s",
result, unit);
val = buffer;
}
}