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Verify output space before doing heavy work in mallctl

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This commit is contained in:
Yinan Zhang 2020-07-22 14:46:43 -07:00
parent f5fb4e5a97
commit fb347dc618
2 changed files with 42 additions and 16 deletions
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21
doc/jemalloc.xml.in
View File

@ -1760,7 +1760,16 @@ malloc_conf = "xmalloc:true";]]></programlisting>
automatically managed one that is used by default. Each explicit cache
can be used by only one thread at a time; the application must assure
that this constraint holds.
</para>
<para>If the amount of space supplied for storing the thread-specific
cache identifier does not equal
<code language="C">sizeof(<type>unsigned</type>)</code>, no
thread-specific cache will be created, no data will be written to the
space pointed by <parameter>oldp</parameter>, and
<parameter>*oldlenp</parameter> will be set to 0.
</para></listitem>
</varlistentry>
<varlistentry id="tcache.flush">
@ -2300,7 +2309,14 @@ struct extent_hooks_s {
</term>
<listitem><para>Explicitly create a new arena outside the range of
automatically managed arenas, with optionally specified extent hooks,
and return the new arena index.</para></listitem>
and return the new arena index.</para>
<para>If the amount of space supplied for storing the arena index does
not equal <code language="C">sizeof(<type>unsigned</type>)</code>, no
arena will be created, no data will be written to the space pointed by
<parameter>oldp</parameter>, and <parameter>*oldlenp</parameter> will
be set to 0.
</para></listitem>
</varlistentry>
<varlistentry id="arenas.lookup">
@ -3607,7 +3623,8 @@ MAPPED_LIBRARIES:
<listitem><para><parameter>newp</parameter> is not
<constant>NULL</constant>, and <parameter>newlen</parameter> is too
large or too small. Alternatively, <parameter>*oldlenp</parameter>
is too large or too small; in this case as much data as possible
is too large or too small; when it happens, except for a very few
cases explicitly documented otherwise, as much data as possible
are read despite the error, with the amount of data read being
recorded in <parameter>*oldlenp</parameter>.</para></listitem>
</varlistentry>

21
src/ctl.c
View File

@ -1488,6 +1488,15 @@ ctl_mtx_assert_held(tsdn_t *tsdn) {
} \
} while (0)
/* Verify that the space provided is enough. */
#define VERIFY_READ(t) do { \
if (oldp == NULL || oldlenp == NULL || *oldlenp != sizeof(t)) { \
*oldlenp = 0; \
ret = EINVAL; \
goto label_return; \
} \
} while (0)
#define READ(v, t) do { \
if (oldp != NULL && oldlenp != NULL) { \
if (*oldlenp != sizeof(t)) { \
@ -2103,6 +2112,7 @@ tcache_create_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
unsigned tcache_ind;
READONLY();
VERIFY_READ(unsigned);
if (tcaches_create(tsd, b0get(), &tcache_ind)) {
ret = EFAULT;
goto label_return;
@ -2608,10 +2618,6 @@ arenas_narenas_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
READONLY();
if (*oldlenp != sizeof(unsigned)) {
ret = EINVAL;
goto label_return;
}
narenas = ctl_arenas->narenas;
READ(narenas, unsigned);
@ -2702,6 +2708,7 @@ arenas_create_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
VERIFY_READ(unsigned);
extent_hooks = (extent_hooks_t *)&ehooks_default_extent_hooks;
WRITE(extent_hooks, extent_hooks_t *);
if ((arena_ind = ctl_arena_init(tsd, extent_hooks)) == UINT_MAX) {
@ -2731,12 +2738,14 @@ arenas_lookup_ctl(tsd_t *tsd, const size_t *mib,
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
WRITE(ptr, void *);
edata = emap_edata_lookup(tsd_tsdn(tsd), &arena_emap_global, ptr);
if (edata == NULL)
if (edata == NULL) {
goto label_return;
}
arena = arena_get_from_edata(edata);
if (arena == NULL)
if (arena == NULL) {
goto label_return;
}
arena_ind = arena_ind_get(arena);
READ(arena_ind, unsigned);