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From: "siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/28770] Unexpected return value from realpath() for too
 long results (CVE-2021-3998)
Date: Fri, 21 Jan 2022 17:45:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28770

Siddhesh Poyarekar <siddhesh at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.35
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #1 from Siddhesh Poyarekar <siddhesh at sourceware dot org> ---
Fixed on trunk:

commit ee8d5e33adb284601c00c94687bc907e10aec9bb
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Thu Jan 13 11:28:36 2022 +0530

    realpath: Set errno to ENAMETOOLONG for result larger than PATH_MAX [BZ
#28770]

    realpath returns an allocated string when the result exceeds PATH_MAX,
    which is unexpected when its second argument is not NULL.  This results
    in the second argument (resolved) being uninitialized and also results
    in a memory leak since the caller expects resolved to be the same as the
    returned value.

    Return NULL and set errno to ENAMETOOLONG if the result exceeds
    PATH_MAX.  This fixes [BZ #28770], which is CVE-2021-3998.

    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
    Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

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