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bh=Rvwwz9APrUgUi3+uvuC/OcD5rl57715EpiDzxqISbbE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=2H2U7Ly3vhgOZHpn1uCxAJkLvo/SehqdC+lZc0iMtkGi2XXtOJbq49Yj3Eb+haTql Ez6t2KunTHkqDYuA5kFmBiFcvOoGPSJuCc34Nc+AQLraS9JsxqD1ryhEtYskfFdth/ BrM4QFRVOrbHI1OiDGoYyjHwH+Ks6tl+4EnAbpIg= Date: Fri, 24 Mar 2023 13:36:46 -0700 From: Andrew Morton To: linux-mm@kvack.org, David Herrmann , yshuiv7@gmail.com Cc: bugzilla-daemon@kernel.org Subject: Re: [Bug 217238] New: Creating shared read-only map is denied after add write seal to a memfd Message-Id: <20230324133646.16101dfa666f253c4715d965@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: s3zqyx1zcfhtctxkdzzjgopyofdzzyma X-Rspam-User: X-Rspamd-Queue-Id: AC17F12001C X-Rspamd-Server: rspam06 X-HE-Tag: 1679690210-892241 X-HE-Meta: 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 vqMbMFaK wC3V8EeMUxi4Hh8OQCLnWWrHBjr0u+ZL1NygdzGpawLnn5eFQr2mgb5jiIOpknusuIPneXC8ORgDn3LxYjfFvXKkY38E7AfRIradHItp+s0E6jJ8kFzHG1efYMLQGuQA8jodrrFWDrh0j1Vz5Y+SN+C/bUjGREm7s7DcZDXwPeLlzbsKXGmekBMR33/xcfWcLen6XV7MuRpuLFObuDlFc6I+ouaitlykBv99Bhy+LtYU9mK6d+3f+klmCSdAMX4kHC2aIWrxAJ5KpC+tEaK9+25eg/BnsTlIrHuP4+tjNNZP4CaZAgplTOPDtEw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Fri, 24 Mar 2023 03:34:23 +0000 bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=217238 > > Bug ID: 217238 > Summary: Creating shared read-only map is denied after add > write seal to a memfd > Product: Memory Management > Version: 2.5 > Kernel Version: 6.2.8 > Hardware: All > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Other > Assignee: akpm@linux-foundation.org > Reporter: yshuiv7@gmail.com > Regression: No > > Test case: > > int main() { > int fd = memfd_create("test", MFD_ALLOW_SEALING); > write(fd, "test", 4); > fcntl(fd, F_ADD_SEALS, F_SEAL_WRITE); > > void *ret = mmap(NULL, 4, PROT_READ, MAP_SHARED, fd, 0); > } > > This fails with EPERM. This is in contradiction with what's described in the > documentation of F_SEAL_WRITE. > > -- > You may reply to this email to add a comment. > > You are receiving this mail because: > You are the assignee for the bug.