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Donenfeld" Cc: Alexander Gordeev , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Harald Freudenberger , Stefan Liebler , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 5/7] s390/vdso: Allow alternatives in vdso code Date: Fri, 13 Sep 2024 15:05:41 +0200 Message-ID: <20240913130544.2398678-6-hca@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240913130544.2398678-1-hca@linux.ibm.com> References: <20240913130544.2398678-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: GK6W9mLi6BybWCboA39Wm71uXlt-4Hxq X-Proofpoint-ORIG-GUID: GK6W9mLi6BybWCboA39Wm71uXlt-4Hxq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-13_09,2024-09-13_02,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 clxscore=1015 phishscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 mlxscore=0 mlxlogscore=913 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409130087 Content-Type: text/plain; charset="utf-8" Implement the infrastructure required to allow alternatives in vdso code. Signed-off-by: Heiko Carstens --- arch/s390/kernel/vdso.c | 19 +++++++++++++++++++ arch/s390/kernel/vdso64/vdso64.lds.S | 4 ++++ 2 files changed, 23 insertions(+) diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 2f967ac2b8e3..8e4e6b316337 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -12,12 +12,14 @@ #include #include #include +#include #include #include #include #include #include #include +#include #include =20 extern char vdso64_start[], vdso64_end[]; @@ -250,8 +252,25 @@ static struct page ** __init vdso_setup_pages(void *st= art, void *end) return pagelist; } =20 +static void vdso_apply_alternatives(void) +{ + const struct elf64_shdr *alt, *shdr; + struct alt_instr *start, *end; + const struct elf64_hdr *hdr; + + hdr =3D (struct elf64_hdr *)vdso64_start; + shdr =3D (void *)hdr + hdr->e_shoff; + alt =3D find_section(hdr, shdr, ".altinstructions"); + if (!alt) + return; + start =3D (void *)hdr + alt->sh_offset; + end =3D (void *)hdr + alt->sh_offset + alt->sh_size; + apply_alternatives(start, end); +} + static int __init vdso_init(void) { + vdso_apply_alternatives(); vdso64_mapping.pages =3D vdso_setup_pages(vdso64_start, vdso64_end); if (IS_ENABLED(CONFIG_COMPAT)) vdso32_mapping.pages =3D vdso_setup_pages(vdso32_start, vdso32_end); diff --git a/arch/s390/kernel/vdso64/vdso64.lds.S b/arch/s390/kernel/vdso64= /vdso64.lds.S index 37e2a505e81d..fa02c6ae3cac 100644 --- a/arch/s390/kernel/vdso64/vdso64.lds.S +++ b/arch/s390/kernel/vdso64/vdso64.lds.S @@ -42,6 +42,10 @@ SECTIONS .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } .rodata1 : { *(.rodata1) } =20 + . =3D ALIGN(8); + .altinstructions : { *(.altinstructions) } + .altinstr_replacement : { *(.altinstr_replacement) } + .dynamic : { *(.dynamic) } :text :dynamic =20 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr --=20 2.43.0