msgq: fix permission of subscribers #636
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This patch changes mmap() protection of subscribers from 'PROT_READ | PROT_WRITE' to 'PROT_READ' only. It can prevent data area curruption by unintentional writes from subscribers to shared memory area.
This patch fixes tests of msgq to distinguish between msgq_new_queue() funtions of pub/sub.
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Seems like it's still easy to setup a subscriber that can write. Can you add a test to ensure that doesn't happen? Or even better, can you think of a way to rewrite it to make that bug less likely? |
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Thank you for your comment! I'm targeting for 'normal subscribers' that use |
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The current implementation of MSGQ and VisionIPC allows subscriber processes to potentially overwrite publisher's data because subscribers have write permissions for shared data area of the queue.
This patch changes mmap() protection of subscribers from
PROT_READ | PROT_WRITEtoPROT_READonly.This prevents unintended writes by subscribers and ensures the integrity of publisher's data.