From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 330F562802; Tue, 23 Jan 2024 01:56:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974961; cv=none; b=NL0tLVj28W1tLiRy/Eitr16mp4R/xs9tQLvvmPmnIp9SBUUQimb0D5W5nLMl0jeYofMc6mdy8WMbyBF0a9m+1UhiRfB8QHtHpYCCAEwqLvrOz9k4TWczO3YN2GlfDzz9YzzjckNH48Yr1Wh4OK4+7j+Mnow/OoHnaamfwUe4ut4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974961; c=relaxed/simple; bh=1DH0bgOwtVF3kT1YGSHqPnsHy7qIQQig1BbLFfUeGR8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pOWy3PANNXyxSaQRPpwXO5XExEaYEPo3wEqWi/h4T445QbqDYfdsveMzdpvfQlEwS4fHfPl/vYRkG1MG2dKh+kSUMAcfFWRJYkuzprkQiptfYC6jHodugDzfYNZpJFEGcms7ip3wbZiDzofFNUQtfbxzqDrmRfrXo7vBuFEjfMQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xsyOIgNX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xsyOIgNX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1D25C433B1; Tue, 23 Jan 2024 01:56:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705974961; bh=1DH0bgOwtVF3kT1YGSHqPnsHy7qIQQig1BbLFfUeGR8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xsyOIgNX0OhmPzXGO5Q4iBknEx+QeI+F2i/JrtGVWAcKgj/XJGIoRSP3NdPEucnsQ 0hQAAZ7vQHuuTJgnwaAj2eET7PMT3AxmE12FrWcZulGCQWEmYnuVFCNSydhknMR+qr gy++EyMCDNnLwXBFVKe/XtQ0Fp/gsZD2z38tYZMU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexandre Ghiti , Charlie Jenkins , Palmer Dabbelt , Sasha Levin Subject: [PATCH 5.15 297/374] riscv: Check if the code to patch lies in the exit section Date: Mon, 22 Jan 2024 15:59:13 -0800 Message-ID: <20240122235755.116673792@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235744.598274724@linuxfoundation.org> References: <20240122235744.598274724@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexandre Ghiti [ Upstream commit 420370f3ae3d3b883813fd3051a38805160b2b9f ] Otherwise we fall through to vmalloc_to_page() which panics since the address does not lie in the vmalloc region. Fixes: 043cb41a85de ("riscv: introduce interfaces to patch kernel code") Signed-off-by: Alexandre Ghiti Reviewed-by: Charlie Jenkins Link: https://lore.kernel.org/r/20231214091926.203439-1-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/include/asm/sections.h | 1 + arch/riscv/kernel/patch.c | 11 ++++++++++- arch/riscv/kernel/vmlinux-xip.lds.S | 2 ++ arch/riscv/kernel/vmlinux.lds.S | 2 ++ 4 files changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h index 32336e8a17cb..a393d5035c54 100644 --- a/arch/riscv/include/asm/sections.h +++ b/arch/riscv/include/asm/sections.h @@ -13,6 +13,7 @@ extern char _start_kernel[]; extern char __init_data_begin[], __init_data_end[]; extern char __init_text_begin[], __init_text_end[]; extern char __alt_start[], __alt_end[]; +extern char __exittext_begin[], __exittext_end[]; static inline bool is_va_kernel_text(uintptr_t va) { diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c index e099961453cc..160e5c1caa9c 100644 --- a/arch/riscv/kernel/patch.c +++ b/arch/riscv/kernel/patch.c @@ -13,6 +13,7 @@ #include #include #include +#include struct patch_insn { void *addr; @@ -23,6 +24,14 @@ struct patch_insn { int riscv_patch_in_stop_machine = false; #ifdef CONFIG_MMU + +static inline bool is_kernel_exittext(uintptr_t addr) +{ + return system_state < SYSTEM_RUNNING && + addr >= (uintptr_t)__exittext_begin && + addr < (uintptr_t)__exittext_end; +} + /* * The fix_to_virt(, idx) needs a const value (not a dynamic variable of * reg-a0) or BUILD_BUG_ON failed with "idx >= __end_of_fixed_addresses". @@ -33,7 +42,7 @@ static __always_inline void *patch_map(void *addr, const unsigned int fixmap) uintptr_t uintaddr = (uintptr_t) addr; struct page *page; - if (core_kernel_text(uintaddr)) + if (core_kernel_text(uintaddr) || is_kernel_exittext(uintaddr)) page = phys_to_page(__pa_symbol(addr)); else if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX)) page = vmalloc_to_page(addr); diff --git a/arch/riscv/kernel/vmlinux-xip.lds.S b/arch/riscv/kernel/vmlinux-xip.lds.S index 9c9f35091ef0..5407eafa166b 100644 --- a/arch/riscv/kernel/vmlinux-xip.lds.S +++ b/arch/riscv/kernel/vmlinux-xip.lds.S @@ -29,10 +29,12 @@ SECTIONS HEAD_TEXT_SECTION INIT_TEXT_SECTION(PAGE_SIZE) /* we have to discard exit text and such at runtime, not link time */ + __exittext_begin = .; .exit.text : { EXIT_TEXT } + __exittext_end = .; .text : { _text = .; diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S index 5104f3a871e3..adcfe9c6a7bf 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -73,10 +73,12 @@ SECTIONS __soc_builtin_dtb_table_end = .; } /* we have to discard exit text and such at runtime, not link time */ + __exittext_begin = .; .exit.text : { EXIT_TEXT } + __exittext_end = .; __init_text_end = .; . = ALIGN(SECTION_ALIGN); -- 2.43.0