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From: Namhyung Kim <namhyung@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, 
 Arnaldo Carvalho de Melo <acme@kernel.org>, 
 Ondrej Mosnacek <omosnace@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>, 
 Alexander Shishkin <alexander.shishkin@linux.intel.com>, 
 Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>, 
 Adrian Hunter <adrian.hunter@intel.com>, 
 James Clark <james.clark@linaro.org>, Ravi Bangoria <ravi.bangoria@amd.com>, 
 linux-perf-users@vger.kernel.org, selinux@vger.kernel.org, 
 linux-kernel@vger.kernel.org
In-Reply-To: <20260701062321.517351-1-omosnace@redhat.com>
References: <20260701062321.517351-1-omosnace@redhat.com>
Subject: Re: [PATCH v2] perf test amd ibs: avoid using executable heap
Message-Id: <178335709933.2202965.9164645344141346476.b4-ty@kernel.org>
Date: Mon, 06 Jul 2026 09:58:19 -0700
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On Wed, 01 Jul 2026 08:23:21 +0200, Ondrej Mosnacek wrote:
> Making [parts of] the heap executable is dangerous and is blocked by
> SELinux on Fedora/RHEL even for an unconfined user. Replace the malloc()
> + mprotect() combo with just mmap(), creating a private anonymous rwx
> mapping, which only requires the more commonly allowed "execmem"
> permission under SELinux (things like JIT or regex compilation need it
> as well). mmap() with MAP_ANONYMOUS will give us a zeroed mapping that
> begins on a page boundary, so the result is equivalent to the original
> code even without a memset() or the page-alignment dance.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung