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Sat, 08 Nov 2025 00:06:14 -0800 (PST) Received: by ikb-h07-29-noble.in.iijlab.net (Postfix, from userid 1010) id BE10811388D5; Sat, 8 Nov 2025 17:06:12 +0900 (JST) From: Hajime Tazaki To: linux-um@lists.infradead.org Cc: thehajime@gmail.com, ricarkol@google.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH v13 08/13] x86/um/vdso: nommu: vdso memory update Date: Sat, 8 Nov 2025 17:05:43 +0900 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: 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 Content-Type: text/plain; charset="utf-8" On !MMU mode, the address of vdso is accessible from userspace. This commit implements the entry point by pointing a block of page address. This commit also add memory permission configuration of vdso page to be executable. Signed-off-by: Hajime Tazaki Signed-off-by: Ricardo Koller --- arch/x86/um/vdso/vma.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/x86/um/vdso/vma.c b/arch/x86/um/vdso/vma.c index 51a2b9f2eca9..0799b3fe7521 100644 --- a/arch/x86/um/vdso/vma.c +++ b/arch/x86/um/vdso/vma.c @@ -9,6 +9,7 @@ #include #include #include +#include =20 unsigned long um_vdso_addr; static struct page *um_vdso; @@ -20,18 +21,29 @@ static int __init init_vdso(void) { BUG_ON(vdso_end - vdso_start > PAGE_SIZE); =20 - um_vdso_addr =3D task_size - PAGE_SIZE; - um_vdso =3D alloc_page(GFP_KERNEL); if (!um_vdso) panic("Cannot allocate vdso\n"); =20 copy_page(page_address(um_vdso), vdso_start); =20 +#ifdef CONFIG_MMU + um_vdso_addr =3D task_size - PAGE_SIZE; +#else + /* this is fine with NOMMU as everything is accessible */ + um_vdso_addr =3D (unsigned long)page_address(um_vdso); + os_protect_memory((void *)um_vdso_addr, vdso_end - vdso_start, 1, 0, 1); +#endif + + pr_info("vdso_start=3D%lx um_vdso_addr=3D%lx pg_um_vdso=3D%lx", + (unsigned long)vdso_start, um_vdso_addr, + (unsigned long)page_address(um_vdso)); + return 0; } subsys_initcall(init_vdso); =20 +#ifdef CONFIG_MMU int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) { struct vm_area_struct *vma; @@ -53,3 +65,4 @@ int arch_setup_additional_pages(struct linux_binprm *bprm= , int uses_interp) =20 return IS_ERR(vma) ? PTR_ERR(vma) : 0; } +#endif --=20 2.43.0