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bug#49209: coreutils: stack out-of-bounds write in tail --follow

From: Paul Eggert
Subject: bug#49209: coreutils: stack out-of-bounds write in tail --follow
Date: Sat, 26 Jun 2021 18:47:46 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 6/24/21 8:50 AM, Paul Eggert wrote:

inotify_init can return 1025 even if called first thing, so we also need to dup2 the result of early inotify_init down to 3 (or whatever), or at least to check that it's less than 1024. Choosing 3 is a tricky business, since it's not clear what fds the C library actually needs.

When looking into this I decided it was cleaner to fix coreutils by using 'poll' instead of 'select', as Kamil suggested. I installed the attached patches to do that. The last patch fixes the bug.

Thanks for reporting the problem.

Attachment: 0001-maint-while-1-while-true.patch
Description: Text Data

Attachment: 0002-tail-fix-abuse2-test-race.patch
Description: Text Data

Attachment: 0003-tail-use-poll-not-select.patch
Description: Text Data

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