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Sat, 29 Aug 2020 09:49:42 +0200 Subject: Re: [ARM64][GCC10] Kernel can't load any module due to RWX check From: Qu Wenruo To: linux-modules@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org References: Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0IlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT6JAU4EEwEIADgCGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1oQAKCRDC PZHzoSX+qCY6CACd+mWu3okGwRKXju6bou+7VkqCaHTdyXwWFTsr+/0ly5nUdDtT3yEVggPJ 3VP70wjlrxUjNjFb6iIvGYxiPOrop1NGwGYvQktgRhaIhALG6rPoSSAhGNjwGVRw0km0PlIN D29BTj/lYEk+jVM1YL0QLgAE1AI3krihg/lp/fQT53wLhR8YZIF8ETXbClQG1vJ0cllPuEEv efKxRyiTSjB+PsozSvYWhXsPeJ+KKjFen7ebE5reQTPFzSHctCdPnoR/4jSPlnTlnEvLeqcD ZTuKfQe1gWrPeevQzgCtgBF/WjIOeJs41klnYzC3DymuQlmFubss0jShLOW8eSOOWhLRuQEN BFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcgaCbPEwhLj 1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj/IrRUUka 68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fNGSsRb+pK EKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0q1eW4Jrv 0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEvABEBAAGJ ATwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1rgUJCWpOfwAKCRDCPZHz oSX+qFcEB/95cs8cM1OQdE/GgOfCGxwgckMeWyzOR7bkAWW0lDVp2hpgJuxBW/gyfmtBnUai fnggx3EE3ev8HTysZU9q0h+TJwwJKGv6sUc8qcTGFDtavnnl+r6xDUY7A6GvXEsSoCEEynby 72byGeSovfq/4AWGNPBG1L61Exl+gbqfvbECP3ziXnob009+z9I4qXodHSYINfAkZkA523JG ap12LndJeLk3gfWNZfXEWyGnuciRGbqESkhIRav8ootsCIops/SqXm0/k+Kcl4gGUO/iD/T5 oagaDh0QtOd8RWSMwLxwn8uIhpH84Q4X1LadJ5NCgGa6xPP5qqRuiC+9gZqbq4Nj Message-ID: <2d00ffc3-1176-1b80-20a5-e7f6babf924a@gmx.com> Date: Sat, 29 Aug 2020 15:49:36 +0800 User-Agent: Mozilla/5.0 (X11; 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boundary="===============4437394608085066527==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============4437394608085066527== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="LrxD5NFIiGmv2PyffUTm0g4Tuo9YRoo6F" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --LrxD5NFIiGmv2PyffUTm0g4Tuo9YRoo6F Content-Type: multipart/mixed; boundary="rlFm2pJH6rwrEIdebavTa8tLQTszTJn8z" --rlFm2pJH6rwrEIdebavTa8tLQTszTJn8z Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020/8/29 =E4=B8=8B=E5=8D=883:44, Qu Wenruo wrote: > Hi, >=20 > Recently built a v5.9-rc2 kernel, it boots fine, but unable to load any= > kernel module. >=20 > After some debugging, it shows that it's due to RWX check failure: >=20 > load_module: start > module_enforce_rwx_sections: index=3D22 sh_flags=3D0x7 shf_wx=3D0x5 > layout_and_allocate: module enforce rwx sections > load_module: failed to alloc layout and allocate > load_module: end >=20 > Futhermore, it's unable to disable the RWX check through "make > menuconfig", since the ARCH_OPTIONAL_KERNEL_RWX is no for arm64. >=20 > The offending section 22 looks like this: (the kernel reports 38 > sectors, while we only have 37, thus near-by sections are also shown he= re). >=20 > 20 .data 00000aa0 0000000000000000 0000000000000000 00086d0= 8 > 2**3 > CONTENTS, ALLOC, LOAD, RELOC, DATA > 21 __bug_table 000000cc 0000000000000000 0000000000000000 000877a= 8 > 2**2 > CONTENTS, ALLOC, LOAD, RELOC, DATA > 22 __dyndbg 0000b9b8 0000000000000000 0000000000000000 0008787= 8 > 2**3 > CONTENTS, ALLOC, LOAD, RELOC, DATA > 23 .data.unlikely 00000012 0000000000000000 0000000000000000 > 00093230 2**0 > CONTENTS, ALLOC, LOAD, DATA >=20 > I'm using GCC 10.2.0, could this be the cause? I should check the git log, the module_enforce_rwx_sections() is just recently added by commit 5c3a7db0c7ec ("module: Harden STRICT_MODULE_RWX"= ). Hi Peter, any idea how could this commit causing a regression on arm64 but not on x86_64? Thanks, Qu >=20 > Thanks, > Qu >=20 >=20 >=20 --rlFm2pJH6rwrEIdebavTa8tLQTszTJn8z-- --LrxD5NFIiGmv2PyffUTm0g4Tuo9YRoo6F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAl9KCJAACgkQwj2R86El /qhL9gf/WpdLn2XUpSd4T5qN6nf2VzX2a2mbb7f2toVvhfqRx4s36dJ4QUBfih0N oH71xcamNneLDZ3YkvEDSjow3Gu64Ug+WNT0KavG/xIRD8ThmydtUHvkEeR22hSy bTAYpOQs/MeNxzBM9f6u0aupO7fkhqPFDXMBVWC8BjlthrT1F3AuB9x/nVrDSYlq S474SsdFja5jOejlHMntA7hvIkXzazd14tlen3iqDwUzgzZ4zrPHgPivT4+zJAPs E1ZGP13OVUt8MyFheF8cR/dJB8K4thk2N+VjSbXHTJzZU3SNJ0C6rgZiHjqhpPwg M8zmzdTVnsDCsqFHf4XGosCwSY7nwg== =0wz7 -----END PGP SIGNATURE----- --LrxD5NFIiGmv2PyffUTm0g4Tuo9YRoo6F-- --===============4437394608085066527== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============4437394608085066527==--