From: Jan Beulich <jbeulich@suse.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Binutils <binutils@sourceware.org>
Subject: Re: [PATCH v3] elf: Set p_align to the minimum page size if possible
Date: Fri, 14 Jan 2022 15:07:59 +0100 [thread overview]
Message-ID: <bb1c026e-7a9b-c29a-4a05-b426f5d6ba1d@suse.com> (raw)
In-Reply-To: <CAMe9rOpvZfP+VCK2yZ6b2qWmZUx17295mJx1RF_EziK1G0iaWQ@mail.gmail.com>
On 14.01.2022 15:02, H.J. Lu wrote:
> On Fri, Jan 14, 2022 at 5:40 AM Jan Beulich <jbeulich@suse.com> wrote:
>>
>> On 14.01.2022 14:03, H.J. Lu wrote:
>>> On Fri, Jan 14, 2022 at 12:27 AM Jan Beulich <jbeulich@suse.com> wrote:
>>>>
>>>> On 29.12.2021 20:39, H.J. Lu via Binutils wrote:
>>>>> --- a/ld/testsuite/ld-elf/linux-x86.exp
>>>>> +++ b/ld/testsuite/ld-elf/linux-x86.exp
>>>>> @@ -185,6 +185,42 @@ run_ld_link_exec_tests [list \
>>>>> "" \
>>>>> "tmpdir/indirect-extern-access-2.so" \
>>>>> ] \
>>>>> + [list \
>>>>> + "Run p_align-1a without PIE" \
>>>>> + "$NOPIE_LDFLAGS" \
>>>>> + "" \
>>>>> + { p_align-1.c } \
>>>>> + "p_align-1a" \
>>>>> + "pass.out" \
>>>>> + "$NOPIE_CFLAGS" \
>>>>> + ] \
>>>>> + [list \
>>>>> + "Run p_align-1b with PIE" \
>>>>> + "-pie" \
>>>>> + "" \
>>>>> + { p_align-1.c } \
>>>>> + "p_align-1b" \
>>>>> + "pass.out" \
>>>>> + "-fpie" \
>>>>> + ] \
>>>>> + [list \
>>>>> + "Run p_align-1c with -Wl,-z,max-page-size=0x1000 without PIE" \
>>>>> + "$NOPIE_LDFLAGS -Wl,-z,max-page-size=0x1000" \
>>>>> + "" \
>>>>> + { p_align-1.c } \
>>>>> + "p_align-1c" \
>>>>> + "pass.out" \
>>>>> + "$NOPIE_CFLAGS" \
>>>>> + ] \
>>>>> + [list \
>>>>> + "Run p_align-1d with -Wl,-z,max-page-size=0x1000 with PIE" \
>>>>> + "-pie -Wl,-z,max-page-size=0x1000" \
>>>>> + "" \
>>>>> + { p_align-1.c } \
>>>>> + "p_align-1d" \
>>>>> + "pass.out" \
>>>>> + "-fpie" \
>>>>> + ] \
>>>>> ]
>>>>
>>>> The two PIE variants of this also fail for me on glibc 2.26. Looks
>>>> like LOAD segments' alignment isn't being honored there, at least
>>>> not if it's as big as it is here.
>>>>
>>>
>>> The PIE alignment needs the kernel fix:
>>>
>>> commit ce81bb256a224259ab686742a6284930cbe4f1fa
>>> Author: Chris Kennelly <ckennelly@google.com>
>>> Date: Thu Oct 15 20:12:32 2020 -0700
>>>
>>> fs/binfmt_elf: use PT_LOAD p_align values for suitable start address
>>
>> Well, then the test needs to be skipped if that fix is not in place.
>> After all you're testing binutils behavior here, not kernel or libc one.
>> I'm running a variety of (largely up-to-date) kernels on all of my
>> systems. But it looks like our kernel folks decided against backporting
>> this particular change. And I don't think you expect people to remember
>> to run the testsuite only on top of "certain" kernels?
>
> Care to submit a patch?
I have no idea what to check for. I would really expect you to fix such
an issue (or really two of them, considering the other problem) recently
introduced by you.
Jan
next prev parent reply other threads:[~2022-01-14 14:08 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-29 19:39 H.J. Lu
2022-01-14 8:12 ` Jan Beulich
2022-02-10 12:44 ` Jan Beulich
2022-01-14 8:27 ` Jan Beulich
2022-01-14 13:03 ` H.J. Lu
2022-01-14 13:40 ` Jan Beulich
2022-01-14 14:02 ` H.J. Lu
2022-01-14 14:07 ` Jan Beulich [this message]
2022-01-14 14:14 ` H.J. Lu
2022-01-17 10:38 ` Jan Beulich
2022-01-17 13:44 ` [PATCH] ld: Require GCC 8.0 for p_align-1.c tests H.J. Lu
2022-01-17 13:51 ` Jan Beulich
2022-01-17 13:54 ` H.J. Lu
-- strict thread matches above, loose matches on Subject: below --
2021-12-25 3:54 [PATCH v3] elf: Set p_align to the minimum page size if possible H.J. Lu
2021-12-29 0:42 ` Alan Modra
2021-12-29 19:41 ` H.J. Lu
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