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b=lp9wELlrvJvoeuCK0/zMI5UANnrsQ+T4se/gBOunN8iQDrEi1RstW5G65/9vUEPmI U9UXqoktuU7EViGdT+8yzDZHjl2N0E5vd9veY8uQePuAD9x0oGHf4CotQwSmAD24go gSXTECesL9+kQmgNOk7myjSgr8UboLxcnh/OrEADTLSIqRqZRx4YwXDl6QWc3wVNsO sB/2ZwfKCyhos7Vj9aXXCgNggtmoXoIYLpWXmI9TjsLctEcOG8w3vDT/K6+fVh16nS /UcGgkCV5vp5qC1VRJeMqVPGsaV7+wscOAZaxlqKS8j4DsLjsIu1iQmtuFIX3tL+zm kvFBNXQR3j5iw== From: "Christophe Leroy (CS GROUP)" To: Yury Norov , Andrew Morton , Linus Torvalds , David Laight , Thomas Gleixner Cc: "Christophe Leroy (CS GROUP)" , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, dmaengine@vger.kernel.org, linux-efi@vger.kernel.org, linux-fsi@lists.ozlabs.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-spi@vger.kernel.org, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, ocfs2-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-x25@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-sound@vger.kernel.org, sound-open-firmware@alsa-project.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH v1 8/9] arm64: Add unsafe_copy_from_user() Date: Mon, 27 Apr 2026 19:13:49 +0200 Message-ID: <5b09e58a84c9edcfe5724db5cd57e45d96a96bfa.1777306795.git.chleroy@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2498; i=chleroy@kernel.org; h=from:subject:message-id; bh=vbZIj5I8a11ig9c375SeIMkNInKGe+jckYb8HPag1tw=; b=owGbwMvMwCV2d0KB2p7V54MZT6slMWS+nxmbKDOhb/vkF5+62Iv+nzi0lmWmkWf+tSO3HK9yP D89hV+LoaOUhUGMi0FWTJHl+H/uXTO6vqTmT92lDzOHlQlkCAMXpwBMJCKWkeGFnFP5dUbGE1cO pXr18eg3ndoc9ubDcl2tYxbdt9o1nmkyMvQuDCp+FV4TvfDP3c6+r/YFCyvUNTZlcrea/2SZ/OM dBwcA X-Developer-Key: i=chleroy@kernel.org; a=openpgp; fpr=10FFE6F8B390DE17ACC2632368A92FEB01B8DD78 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: CB9854000A X-Stat-Signature: kaeob33r1uk18qmh83wufbyfhpgq1fqs X-Rspam-User: X-HE-Tag: 1777310352-21866 X-HE-Meta: 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 4ciS6lSQ z8R7Zh6g1luNIosNL/TyHL2CdLN0Wf7YU7dGXeFUY7IW6kKPXfcq3cWi72ZnKl5GlvJZVe30gGzPV8t7F8XKtn/Vvg4u5u7A6nCc3PP019LRXDvFq0sa8ghwb+8nRMguCIX/VJA9PjinO9EOzCQBCONtZsbbblOejZkIwi2zn6GBgMXY0rfZ11ozPsWwf2+i0nThi+QtbYXLua8bvbVWt7pB7Z9DJPhdpvNoLdZUbcJnJIUk9cdEGC+zok+BiDWwRpkRzPmLwZs2Za0XgBJ+FEdF5pjIBfU+PffggBDIGZKu1lyrzdb2ymUZX6/vSh/ksEkvVOHC42OwYIIJ6MoRITHpMud+1l6UXlaJT Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: At the time being, x86 and arm64 are missing unsafe_copy_from_user(). Add it. Signed-off-by: Christophe Leroy (CS GROUP) --- arch/arm64/include/asm/uaccess.h | 29 ++++++++++++++++++++++++----- 1 file changed, 24 insertions(+), 5 deletions(-) diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 1e20ec91b56f..adfdb52cd82b 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -437,7 +437,7 @@ static inline void user_access_restore(unsigned long enabled) { } * We want the unsafe accessors to always be inlined and use * the error labels - thus the macro games. */ -#define unsafe_copy_loop(dst, src, len, type, label) \ +#define unsafe_put_loop(dst, src, len, type, label) \ while (len >= sizeof(type)) { \ unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \ dst += sizeof(type); \ @@ -450,10 +450,29 @@ do { \ char __user *__ucu_dst = (_dst); \ const char *__ucu_src = (_src); \ size_t __ucu_len = (_len); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ + unsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \ + unsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \ + unsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \ + unsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ +} while (0) + +#define unsafe_get_loop(dst, src, len, type, label) \ + while (len >= sizeof(type)) { \ + unsafe_get_user(*(type __user *)(src),(type *)(dst),label); \ + dst += sizeof(type); \ + src += sizeof(type); \ + len -= sizeof(type); \ + } + +#define unsafe_copy_from_user(_dst,_src,_len,label) \ +do { \ + char *__ucu_dst = (_dst); \ + const char __user *__ucu_src = (_src); \ + size_t __ucu_len = (_len); \ + unsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \ + unsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \ + unsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \ + unsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ } while (0) extern unsigned long __must_check __arch_clear_user(void __user *to, unsigned long n); -- 2.49.0