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Add config option limit-usize-gap and runtime option limit_usize_gap.

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Adding a build-time config option (--enable-limit-usize-gap) and a
runtime one (limit_usize_gap) to guard the changes.  When build-time
config is enabled, some minor CPU overhead is expected because usize
will be stored and accessed apart from index.  When runtime option is
also enabled (it can only be enabled with the build-time config
enabled). a new usize calculation approach wil be employed.  This new
calculation will ceil size to the closest multiple of PAGE for all sizes
larger than USIZE_GROW_SLOW_THRESHOLD instead of using the size classes.
This commit is contained in:
guangli-dai 2024-03-26 14:35:29 -07:00 • committed by Guangli Dai
parent c17bf8b368
commit eac4163a95
8 changed files with 60 additions and 0 deletions
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4
src/ctl.c
View file

@ -168,6 +168,7 @@ CTL_PROTO(opt_prof_sys_thread_name)
CTL_PROTO(opt_prof_time_res)
CTL_PROTO(opt_lg_san_uaf_align)
CTL_PROTO(opt_zero_realloc)
CTL_PROTO(opt_limit_usize_gap)
CTL_PROTO(opt_malloc_conf_symlink)
CTL_PROTO(opt_malloc_conf_env_var)
CTL_PROTO(opt_malloc_conf_global_var)
@ -557,6 +558,7 @@ static const ctl_named_node_t opt_node[] = {
{NAME("zero_realloc"), CTL(opt_zero_realloc)},
{NAME("debug_double_free_max_scan"),
CTL(opt_debug_double_free_max_scan)},
{NAME("limit_usize_gap"), CTL(opt_limit_usize_gap)},
{NAME("malloc_conf"), CHILD(named, opt_malloc_conf)}
};
@ -2341,6 +2343,8 @@ CTL_RO_NL_CGEN(config_uaf_detection, opt_lg_san_uaf_align,
opt_lg_san_uaf_align, ssize_t)
CTL_RO_NL_GEN(opt_zero_realloc,
zero_realloc_mode_names[opt_zero_realloc_action], const char *)
CTL_RO_NL_CGEN(config_limit_usize_gap, opt_limit_usize_gap, opt_limit_usize_gap,
bool)
/* malloc_conf options */
CTL_RO_NL_CGEN(opt_malloc_conf_symlink, opt_malloc_conf_symlink,

12
src/jemalloc.c
View file

@ -123,6 +123,13 @@ zero_realloc_action_t opt_zero_realloc_action =
atomic_zu_t zero_realloc_count = ATOMIC_INIT(0);
bool opt_limit_usize_gap =
#ifdef LIMIT_USIZE_GAP
false;
#else
false;
#endif
const char *const zero_realloc_mode_names[] = {
"alloc",
"free",
@ -1763,6 +1770,11 @@ malloc_conf_init_helper(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
"san_guard_large", 0, SIZE_T_MAX,
CONF_DONT_CHECK_MIN, CONF_DONT_CHECK_MAX, false)
if (config_limit_usize_gap) {
CONF_HANDLE_BOOL(opt_limit_usize_gap,
"limit_usize_gap");
}
CONF_ERROR("Invalid conf pair", k, klen, v, vlen);
#undef CONF_ERROR
#undef CONF_CONTINUE