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Thu, 04 Sep 2025 03:23:17 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: floss@arusekk.pl Subject: [PATCH v4 3/4] linux-user: Populate vdso_sigreturn_region_{start, end} from sigtramp page Date: Thu, 4 Sep 2025 12:23:09 +0200 Message-ID: <20250904102311.57383-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250904102311.57383-1-richard.henderson@linaro.org> References: <20250904102311.57383-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=richard.henderson@linaro.org; helo=mail-wm1-x333.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1756981452430116600 Content-Type: text/plain; charset="utf-8" When a target does not support a vdso, we generate a sigtramp page. The only thing on this page is a (set of) signal return syscalls. We do not need to narrowly restrict the vdso_sigreturn_region; simply record the entire page for all such targets. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 28f0909d1a..1370ec59be 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1974,6 +1974,8 @@ int load_elf_binary(struct linux_binprm *bprm, struct= image_info *info) =20 setup_sigtramp(tramp_page); target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXE= C); + vdso_sigreturn_region_start =3D tramp_page; + vdso_sigreturn_region_end =3D tramp_page + TARGET_PAGE_SIZE; } =20 bprm->p =3D create_elf_tables(bprm->p, bprm->argc, bprm->envc, &ehdr, = info, --=20 2.43.0