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Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Rick Edgecombe Subject: Re: [PATCH RFC/RFT 2/3] mm: helper `is_shadow_stack_vma` to check shadow stack vma Message-ID: References: <20241010-shstk_converge-v1-0-631beca676e7@rivosinc.com> <20241010-shstk_converge-v1-2-631beca676e7@rivosinc.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="4zYo/B+253W5RkjB" Content-Disposition: inline In-Reply-To: <20241010-shstk_converge-v1-2-631beca676e7@rivosinc.com> X-Cookie: Editing is a rewording activity. X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 20A6340008 X-Stat-Signature: 1auu6rj4y7cz7ybcw1xdtmezoge7bpxs X-Rspam-User: X-HE-Tag: 1728643133-574663 X-HE-Meta: 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 DZMnRejk bKt98HKCdLgBbRo6V1fSmUs/uuhJOeJZINpiHnhCbQuuRGpkD6pa525pv6n3iZubhAzjOYq5y8ByHWsZXB+9WvQnF6aOLOUL4rNgprZLUZCDuJ8gFXIQdJGYGfFbgvlfmO/ZI8rlOQ0B7CDf8UpS+NcDu4wagVoPP7ey7XrnC7NVFE06g8i7akBuzO6fSnibXm5wTVCAOQ3GEi3X8OTDVn7AGDqmom9dinKgM/3iJW/mHRCgev05KRf8IetRXjnu5XuDpqti2IFuC99vVjI39KAE5Xjy+3z4ke2FCsbPOGSrFZZfqfiBQfRV9QOeQvBU2XVHPjdqFDhQf+ffoZZHkSjoAUDqW2gD2GtQ5EPAJPPaG+Diz6wPUTdIu/CeaUDknfZh4tsnWoeMvNVSKNTXNHvHXVbKINfYkovW79UUzURSbNvo= 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: List-Subscribe: List-Unsubscribe: --4zYo/B+253W5RkjB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Oct 10, 2024 at 05:32:04PM -0700, Deepak Gupta wrote: > VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) is used to encode shadow stack > VMA on three architectures (x86 shadow stack, arm GCS and RISC-V shadow > stack). In case architecture doesn't implement shadow stack, it's VM_NONE > Introducing a helper `is_shadow_stack_vma` to determine shadow stack vma > or not. >=20 > Signed-off-by: Deepak Gupta > --- > mm/gup.c | 2 +- > mm/vma.h | 10 +++++++--- > 2 files changed, 8 insertions(+), 4 deletions(-) As I noted in reply to the version of this patch in the RISC-V series there's another test for VM_SHADOW_STACK in mm/mmap.c. --4zYo/B+253W5RkjB Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmcJADoACgkQJNaLcl1U h9AINQf/X72VpmC3qgyCk9bL7hkP3fb0q1+UbJS64dlYea313u2psyRklZdeIxl9 YBmaV2mf6I9WNwWtqtUlynkA+oz/Mf2pNt1G+kkTYTNWZ/69MTFXSvmKeEdrnQ/c zPFp2eMxC3jAPW3vdRgYQMKDgelzD5g+53LBOryBCOpT0mWrdPrDIAPZcccKpKpf piSVHCCsWEjfzJopQaAZRQgGTVSrtwELR52lOM3FwC8StXwYUEQrBMJFdCKXO0R/ Ib4TWsCcq0UDW91t6zxJvL9Q3wEleYRB83JDFM3N6wz36LkGtvh8mgd9OhhChu7g 4wvien0yfxmNfOx/H1QsE1dnZiZ3bw== =Fanw -----END PGP SIGNATURE----- --4zYo/B+253W5RkjB--