[Bug libc/28993] New: closefrom() iterates until max int if no access to /proc/self/fd/

[Bug libc/28993] New: closefrom() iterates until max int if no access to /proc/self/fd/

[arekm at maven dot pl]

https://sourceware.org/bugzilla/show_bug.cgi?id=28993

            Bug ID: 28993
           Summary: closefrom() iterates until max int if no access to
                    /proc/self/fd/
           Product: glibc
           Version: 2.35
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: arekm at maven dot pl
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

pure-authd and pure-certd (both part of pure-ftpd) use closefrom(3) when built
on glibc 2.35.

If there is no access to /proc/self/fd/ (due to apparmor policy for example)
closefrom(3) will iterate for ages (until max int I guess) causing these
programs to be "stuck" for long time.

openat(AT_FDCWD, "/proc/self/fd/", O_RDONLY|O_DIRECTORY) = -1 EACCES (Brak
dostępu) <0.000035>
and then it will iterate over all fds:
[...]
close(31665557)          = -1 EBADF (Błędny deskryptor pliku) <0.000008>
[...]

>From irc #glibc: __closefrom_fallback probably should handle EACCES just like
it does with ENOENT (abort() process)

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[Bug libc/28993] closefrom() iterates until max int if no access to /proc/self/fd/

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28993

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg
   Target Milestone|---                         |2.36
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.36.

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