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fix potential race on subproc field in the segment

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daanx 2024-06-03 20:57:00 -07:00
parent 76b0873ce2
commit b1188ea336
5 changed files with 19 additions and 21 deletions
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4
include/mimalloc/types.h
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@ -397,9 +397,10 @@ typedef struct mi_segment_s {
bool allow_decommit;
bool allow_purge;
size_t segment_size; // for huge pages this may be different from `MI_SEGMENT_SIZE`
mi_subproc_t* subproc; // segment belongs to sub process
// segment fields
struct mi_segment_s* next; // must be the first segment field after abandoned_next -- see `segment.c:segment_init`
struct mi_segment_s* next; // must be the first (non-constant) segment field -- see `segment.c:segment_init`
struct mi_segment_s* prev;
bool was_reclaimed; // true if it was reclaimed (used to limit on-free reclamation)
@ -410,7 +411,6 @@ typedef struct mi_segment_s {
size_t capacity; // count of available pages (`#free + used`)
size_t segment_info_size;// space we are using from the first page for segment meta-data and possible guard pages.
uintptr_t cookie; // verify addresses in secure mode: `_mi_ptr_cookie(segment) == segment->cookie`
mi_subproc_t* subproc; // segment belongs to sub process
struct mi_segment_s* abandoned_os_next; // only used for abandoned segments outside arena's, and only if `mi_option_visit_abandoned` is enabled
struct mi_segment_s* abandoned_os_prev;