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From: "siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/28340] New: ld.so crashes while loading a DSO with
 a read-only dynamic section
Date: Tue, 14 Sep 2021 17:46:42 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28340

            Bug ID: 28340
           Summary: ld.so crashes while loading a DSO with a read-only
                    dynamic section
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: siddhesh at sourceware dot org
          Reporter: siddhesh at sourceware dot org
  Target Milestone: ---

ld.so crashes when trying to verify DSO with read-only dynamic section, e.g.
vdso64.so as shipped by the Linux kernel.

$ elf/ld.so --verify $(find /usr -name vdso64.so | head -1)

Actual Result:
Segfault

Expected Result:
Not crash

Since there's no way to load a dynamic object that has a read-only .dynamic
section and at the same time, has entries in the .dynamic section that need
adjustment during relocation, e.g. .plt.got address, .symtab address, etc.,
fail to load and return an error.

Patch coming up.

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