Messages in this thread |  | | Date | Mon, 4 Sep 2000 17:07:39 +0100 | From | "Stephen C. Tweedie" <> | Subject | Two VM problems for the 2.4 TODO list |
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Hi Ted,
To be fixed for 2.4:
1) Non-atomic pte updates
The page aging code and mprotect both modify existing ptes non-atomically. That can stomp on the VM hardware on other CPUs setting the dirty bit on mmaped pages when using threads. 2.2 is vulnerable too.
2) RSS locking
swapout holds the page_table_lock while swapping, and adjusts the mm->rss while holding that lock. Other places in the mm are not so careful about holding the lock, so rss (which is not an atomic_t) can be corrupted.
--Stephen
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