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Thu, 10 Oct 2024 18:02:19 +1100 (AEDT) From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728543733; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9IUwLjLb5Rv+Z3rKO8x7unJr00Ts0LBgoCGki607yuU=; b=VUkjSFBk2MQwzN+ejztrVxQKhRHQ+9Yl/6wxSFJwKQcH9II+0ehbH0LPd0MM6vQoZ/HDO3 AQEr2gejOYAR2XAGB/sSNVekevUe6V1wcGFw/QL+DLmC9N99X8j5fyvXaPipiVRRc5Yf4O 2pSZstOJBdCblxxzLGpOQ4jtJFNtb0KRN+2tpga3h86cWvTE6FK95XshBy3V5sBp1pQfAw lD8vKj8R6WKLzfjFUkxp6JxMmVY9z2fhJ2R8eY9/ZtCjHbSjayyacu2J3HORJcdf18+jz4 VXyUxfxScOWvjlPDHn6Gwvam4Q+L7qGpCm+XbyjKpJEpwm1H+HJi1H8JSzzFgw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728543733; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9IUwLjLb5Rv+Z3rKO8x7unJr00Ts0LBgoCGki607yuU=; b=d3/0sfbJfcCoywGbj+ofl3ZPzDeWOe3+X1t86Ir5PG/WJxdDRPOcIBAdlleGtqmDvX4E/l LIXafBtIM6E7x2CA== Date: Thu, 10 Oct 2024 09:01:24 +0200 Subject: [PATCH 22/28] powerpc: procfs: Propagate error of remap_pfn_range() X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20241010-vdso-generic-base-v1-22-b64f0842d512@linutronix.de> References: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> In-Reply-To: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> To: Guo Ren , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , Russell King , Huacai Chen , WANG Xuerui , Theodore Ts'o , "Jason A. Donenfeld" , Thomas Bogendoerfer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Vincenzo Frascino Cc: Christophe Leroy , linux-csky@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1728543717; l=1079; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=ILVVV4C4Cn6a/ycb+VwQKK6Cv18zEgAwyS7MEYqbXP8=; b=rFDW1DuF1EN9zH9ReKWGHDOnqsiH+sp/YP1SF/BKn15kPFCLbQRqr8F1aO3GxLRfzj/ugXTr9 m+/fZDMJUB6DZ3liFKdAy994YFnGHbTZc+LlsXSeuQdIxLarPfK3zOJ X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= If the operation fails and userspace is unaware it will access unmapped memory, crashing the process. Signed-off-by: Thomas Weißschuh --- arch/powerpc/kernel/proc_powerpc.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c index b109cd7b5d01fbe6870b60e60965effa86ecf3b6..910d2082e05fd86bd1146815d4b67633a6f2b459 100644 --- a/arch/powerpc/kernel/proc_powerpc.c +++ b/arch/powerpc/kernel/proc_powerpc.c @@ -33,10 +33,9 @@ static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) return -EINVAL; - remap_pfn_range(vma, vma->vm_start, - __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, - PAGE_SIZE, vma->vm_page_prot); - return 0; + return remap_pfn_range(vma, vma->vm_start, + __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, + PAGE_SIZE, vma->vm_page_prot); } static const struct proc_ops page_map_proc_ops = { -- 2.47.0