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[patch] Fix BZ 23187 -- stack overflow for many Phdr[]s

From: Paul Pluzhnikov <ppluzhnikov at google dot com>
To: GLIBC Devel <libc-alpha at sourceware dot org>
Date: Mon, 21 May 2018 13:34:39 -0700
Subject: [patch] Fix BZ 23187 -- stack overflow for many Phdr[]s

Greetings,

Attached patch fixes several instances of unconstrained stack allocation,
which causes ld.so to overflow stack and crash while processing DSO with
1000s of Phdr[]s, and adds a test case.

2018-05-21  Paul Pluzhnikov  <ppluzhnikov@google.com>

         [BZ #23187]
         * elf/Makefile (tst-many-phdrs): New test.
         * elf/tst-many-phdrs.c: New.
         * elf/dl-load.c (_dl_map_object_from_fd): Constrain stack
allocation.
         (open_verify): Likewise.


-- 
Paul Pluzhnikov

Attachment: glibc-bz23187-20180521.txt
Description: Text document

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