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From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/27181] New: __tunables_init can oom fail
Date: Thu, 14 Jan 2021 11:02:56 +0000
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X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.32
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27181

            Bug ID: 27181
           Summary: __tunables_init can oom fail
           Product: glibc
           Version: 2.32
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: nsz at gcc dot gnu.org
  Target Milestone: ---

__tunables_init happens very early (before libc ifunc
resolvers are run).

it should not unnecessarily introduce failures, but
it allocates memory in tunables_strdup. this is only
needed in setuid executables when the GLIBC_TUNABLES
env var has to be sanitized, so there should be no
failure mode in other cases.

with static pie __tunables_init will happen before self
relocation (after bug 27072 is fixed) so complex code
like _dl_fatal_printf should not be used there otherwise
it's hard to guarantee that there are no relocations.

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