Repository navigation
Conversation
fpm_event_select_wait() and fpm_event_poll_wait() read q->next after firing the event, but fpm_stdio_child_said() deletes its own event when a worker pipe reaches EOF, which frees q. The iterator must not touch a node a callback may have freed, so save the successor before firing, as the timer loop in fpm_event_loop() already does. With catch_workers_output enabled, the loop reads freed memory when a worker exits under select, and under poll on Linux when the worker leaves unread output in its pipe. With glibc this crashes the master.
iliaal
force-pushed
the
fix/aph-fpm-event-queue-uaf-84
branch
from
November 2, 2026 13:40
d7890aa to
aae52e1
Compare
Owner
Author
|
Promoted upstream: php#25154 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Save the next FPM event-queue node before invoking callbacks that may remove the current event, fixing both poll and select backends. The FPM binary builds and its configuration test succeeds.