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[sysvshm] Clamp shm_get_var chunk length to segment bounds - #23495

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iliaal:fix/sysvshm-getvar-len-trust-84
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[sysvshm] Clamp shm_get_var chunk length to segment bounds#23495
iliaal wants to merge 1 commit into
php:PHP-8.4from
iliaal:fix/sysvshm-getvar-len-trust-84

[sysvshm] Validate segment header and chunk bounds before use

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succeeded Aug 31, 2026 in 5s