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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/106301] New: RFE: analyzer support of mmap
Date: Thu, 14 Jul 2022 15:03:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106301

            Bug ID: 106301
           Summary: RFE: analyzer support of mmap
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
            Blocks: 106003
  Target Milestone: ---

Now that the analyzer can track uses of file-descriptors, we may want to
special-case mmap:
  https://www.man7.org/linux/man-pages/man2/mmap.2.html

  void *mmap(void *addr, size_t length, int prot, int flags,
             int fd, off_t offset);

If (flags & MAP_ANONYMOUS) is false, then "fd" is required to be an open fi=
le
descriptor (and the access direction must match that expressed by "prot").

If (flags & MAP_ANONYMOUS) is true, then some implementations require "fd" =
to
be -1.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106003
[Bug 106003] RFE: -fanalyzer could complain about misuse of file-descriptor=
s=