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

[Paul Eggert]

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.

0001-maint-while-1-while-true.patch
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0002-tail-fix-abuse2-test-race.patch
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0003-tail-use-poll-not-select.patch
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