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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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test/unit/mallctl.c
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@ -332,6 +332,7 @@ TEST_BEGIN(test_mallctl_opt) {
TEST_MALLCTL_OPT(bool, prof_sys_thread_name, prof);
TEST_MALLCTL_OPT(ssize_t, lg_san_uaf_align, uaf_detection);
TEST_MALLCTL_OPT(unsigned, debug_double_free_max_scan, always);
TEST_MALLCTL_OPT(bool, limit_usize_gap, limit_usize_gap);
#undef TEST_MALLCTL_OPT
}