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Always release memory

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dmiller 2026-05-26 01:52:16 +00:00
parent 236a392cf0
commit ff028e681f
13 changed files with 6 additions and 128 deletions
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3
CHANGELOG
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@ -1,5 +1,8 @@
#Nmap Changelog ($Id$); -*-text-*-
o The --release-memory option is now a no-op. Nmap will always run finalization
routines that release allocated memory before closing.
o Fixed an integer underflow in service_scan.cc that would cause little-endian
integers extracted from the beginning of a service banner to be interpreted
as 0. Discovered with AFL++ by Malek Althubiany.

1
NmapOps.cc
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@ -315,7 +315,6 @@ void NmapOps::Initialize() {
ipoptionslen = 0;
ipopt_firsthop = 0;
ipopt_lasthop = 0;
release_memory = false;
topportlevel = -1;
#ifndef NOLUA
script = false;

1
NmapOps.h
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@ -339,7 +339,6 @@ class NmapOps {
bool noninteractive;
char *locale;
bool release_memory; /* suggest to release memory before quitting. used to find memory leaks. */
private:
int max_os_tries;
int max_rtt_timeout;

15
docs/man-xlate/nmap-man-de.xml
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@ -4075,21 +4075,6 @@ gesetzt werden.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (gibt Speicher vor Terminierung frei)
<indexterm><primary><option>--release-memory</option></primary></indexterm>
</term>
<listitem>
<para>Diese Option ist nur bei der Suche nach Speicherlecks nützlich.
Sie bewirkt, dass Nmap den von ihm belegten Speicher direkt vor seiner
Terminierung freigibt, damit man echte Speicherlecks einfacher finden kann.
Normalerweise macht Nmap das nicht, weil es das Betriebssystem ohnehin
macht, wenn es den Prozess terminiert.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (gibt Versionsnummer aus)

12
docs/man-xlate/nmap-man-fr.xml
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@ -2112,18 +2112,6 @@ le temps supplémentaire que cela suppose.</para>
<option>--unprivileged</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (Libérer la mémoire avant de quitter)
</term>
<listitem>
<para>Cette option n'est utile que dans le cadre du deboggage de fuites de mémoire.
Elle force Nmap a libérer la mémoire allouée juste avant de
quitter de facon a repérer les véritables fuites de mémoire.
En temps normal Nmap ne fait pas ceci étant donné que l'OS le fait de toutes facons
à la fin du processus.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (Affiche le numéro de version)

16
docs/man-xlate/nmap-man-hu.xml
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@ -3459,22 +3459,6 @@ kapuk csak egy számként jelennek meg, ha túl sok van belőlük.
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (Kilépés előtt felszabadítja a memóriát)
<indexterm significance="normal"><primary>--release-memory</primary></indexterm>
</term>
<listitem>
<para>Ez a paraméter csak a memóriaszivárgási hibák keresésekor hasznos.
Arra utasítja az Nmap programot, hogy a kilépés előtt szabadítsa fel a
lefoglalt memóriát, így a memóriaszivárgás könnyen felderíthető. Normál
helyzetben az Nmap átugorja ezt, mivel a program leállításakor az operációs
rendszert ezt amúgy is végrehajtja.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (Programváltozat megjelenítése)

16
docs/man-xlate/nmap-man-id.xml
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@ -3755,22 +3755,6 @@ banyaknya permintaan. Berikan <option>--open</option> untuk hanya melihat port
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (Release memory before quitting)
<indexterm significance="normal"><primary><option>--release-memory</option></primary></indexterm>
</term>
<listitem>
<para>Opsi ini hanya berguna untuk memory-leak debugging.
Ia membuat Nmap merilis memori yang telah dialokasikan sebelum ia berhenti
sehingga kebocoran memori sebenarnya mudah ditemukan.
Normalnya Nmap melewati langkah ini karena SO melakukannya setelah
penghentian proses.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (Print version number)

14
docs/man-xlate/nmap-man-it.xml
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@ -4343,20 +4343,6 @@ SEE THE MAN PAGE (https://nmap.org/book/man.html) FOR MORE OPTIONS AND EXAMPLES
</listitem>
</varlistentry>
<varlistentry>
<term><option>--release-memory </option>(Release memory before
quitting)</term>
<listitem>
<para>Quest'opzione è utile solo per la risoluzione di problemi di
perdita di memoria (memory-leak debugging). Obbliga infatti ad Nmap
a liberare la memoria allocata appena prima di uscire così da
individuare più facilmente le effettive perdite di memoria. Di
solito Nmap salta questo passaggio come fa il sistema operativo in
ogni caso al momento della chiusura del processo.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-V</option>; <option>--version</option> (Print version
number)</term>

2
docs/man-xlate/nmap-man-ja.xml
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@ -1362,7 +1362,7 @@ rttvar: 14987 to: 100000</computeroutput>。こうした行の内容が理解で
</listitem>
</varlistentry>
<!-- Missing options: -/-unprivileged -/-release-memory -->
<!-- Missing options: -/-unprivileged -->
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (バージョン番号を表示する)

18
docs/man-xlate/nmap-man-pt_BR.xml
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@ -3554,24 +3554,6 @@ EXAMPLES:
</listitem>
</varlistentry>
<varlistentry>
<term><option>--release-memory</option> (Release memory before
quitting)</term>
<listitem>
<indexterm significance="normal">
<primary>--release-memory</primary>
</indexterm>
<para>Esta opção é útil apenas para depuração de vazamentos de
memória (memory-leak). Ela faz com que o Nmap libere memória
alocada pouco antes de encerrar de forma a tornar os vazamentos de
memória reais mais fáceis de se ver. Normalmente o Nmap pula essa
parte pois o SO faz isso de qualquer forma no encerramento de um
processo.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-V</option>; <option>--version</option> (Mostra o
número da versão)</term>

14
docs/man-xlate/nmap-man-ru.xml
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@ -3295,20 +3295,6 @@ rttvar: 14987 to: 100000</computeroutput>. Если вы не понимаете
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (Освободить память перед завершением работы)
<indexterm significance="normal"><primary><option>--release-memory</option></primary></indexterm>
</term>
<listitem>
<para>Эта опция полезна только во время отладки утечки памяти. Заставляет Nmap освободить занянутю память
перед завершением работы, что облегчает задачу обнаружения действительной утечки памяти. В обычном режиме
работы Nmap пропускает этот шаг, так ОС делает это самостоятельно при закрытии процесса.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (Вывести номер версии)

16
docs/refguide.xml
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@ -4488,22 +4488,6 @@ hosts with at least one
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--release-memory</option> (Release memory before quitting)
<indexterm><primary><option>--release-memory</option></primary></indexterm>
</term>
<listitem>
<para>This option is only useful for memory-leak debugging.
It causes Nmap to release allocated memory just before it
quits so that actual memory leaks are easier to spot.
Normally Nmap skips this as the OS does this anyway upon
process termination.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-V</option>; <option>--version</option> (Print version number)

6
nmap.cc
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@ -728,7 +728,7 @@ void parse_options(int argc, char **argv) {
} else if (strcmp(long_options[option_index].name, "nogcc") == 0) {
o.nogcc = true;
} else if (strcmp(long_options[option_index].name, "release-memory") == 0) {
o.release_memory = true;
/* No-op. We always release memory now. */
} else if (strcmp(long_options[option_index].name, "min-parallelism") == 0) {
o.min_parallelism = atoi(optarg);
if (o.min_parallelism < 1)
@ -2371,9 +2371,7 @@ int nmap_main(int argc, char *argv[]) {
eth_close_cached();
if (o.release_memory) {
nmap_free_mem();
}
nmap_free_mem();
if (o.resuming) {
arg_parse_free(argv);
}