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Date: Thu, 10 Sep 2026 12:09:16 +0200
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Subject: Re: [RFC PATCH] linux-user: madvise() on unmapped ranges should
 return ENOMEM
From: Helge Deller <deller@gmx.de>
To: =?UTF-8?Q?Alex_Benn=C3=A9e?= <alex.bennee@linaro.org>,
 qemu-devel@nongnu.org
Cc: Laurent Vivier <laurent@vivier.eu>,
 Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
References: <20260903142720.1467316-1-alex.bennee@linaro.org>
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On 9/9/26 23:17, Helge Deller wrote:
> Hi Alex,
>=20
> On 9/3/26 16:27, Alex Benn=C3=A9e wrote:
>> Per madvise(2) and the Linux kernel implementation (madvise_walk_vmas),
>> madvise() must validate that the requested range is currently mapped
>> and return -ENOMEM if any page in the range is unmapped.
>>
>> Add a page_check_range(start, len, PAGE_VALID) check for valid advice
>> values before proceeding with the advice actions. In addition, extend t=
he
>> tcg multiarch test linux-madvise.c to test this behaviour.
>>
>> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/4382
>> AI-used-for: importing and validating test case
>> Signed-off-by: Alex Benn=C3=A9e <alex.bennee@linaro.org>
>>
>> ---
>> NOTE
>> =C2=A0=C2=A0 - again testing the minimal agents which did stop and say:
>>
>> *(Note: Per user policy, git commits are never executed automatically b=
y the agent. Please review the diff with `git diff` and commit the changes=
 if you are satisfied.)*
>>
>> =C2=A0=C2=A0 but non-the-less imported the test and wrote a crap patch =
which I
>> =C2=A0=C2=A0 have re-done dropping a load of unneeded verbosity.
>=20
>=20
> Did you test this patch?
> If yes, did it work for you?
> I'm asking, because I tried the testcase from the bug report, and
> in qemu I still get 0 (success).
Oh, this was a misconfiguration on my side.
The patch works ok!

Reviewed-by: Helge Deller <deller@gmx.de>
Tested-by: Helge Deller <deller@gmx.de>

Thanks!
Helge