linux-kernel - [PATCH 2/2] arm/mm : Report actual image regions in /proc/iomem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1678081915-12599-2-git-send-email-js07.lee@samsung.com>
Date:   Mon,  6 Mar 2023 14:51:55 +0900
From:   Jungseung Lee <js07.lee@...sung.com>
To:     rmk+kernel@...linux.org.uk, linus.walleij@...aro.org,
        amit.kachhap@....com, ardb@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        keescook@...omium.org, js07.lee@...sung.com, js07.lee@...il.com
Subject: [PATCH 2/2] arm/mm : Report actual image regions in /proc/iomem

 The resource reservations in /proc/iomem made for the kernel image did
 not reflect the gaps between text, rodata, and data.
 Add the "rodata" resource and update the start/end calculations.

 Before :
04000000-2f7fffff : System RAM
  04100000-04cfffff : Kernel code
  04e00000-05369a27 : Kernel data

 After :
04000000-2f7fffff : System RAM
  04100000-049fffff : Kernel code
  04a00000-04cb2fff : Kernel rodata
  04e00000-05369a27 : Kernel data

Signed-off-by: Jungseung Lee <js07.lee@...sung.com>
---
 arch/arm/kernel/setup.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 3059860..85af967 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -181,6 +181,12 @@ static struct resource mem_res[] = {
 		.flags = IORESOURCE_SYSTEM_RAM
 	},
 	{
+		.name = "Kernel rodata",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_SYSTEM_RAM
+	},
+	{
 		.name = "Kernel data",
 		.start = 0,
 		.end = 0,
@@ -188,9 +194,10 @@ static struct resource mem_res[] = {
 	}
 };
 
-#define video_ram   mem_res[0]
-#define kernel_code mem_res[1]
-#define kernel_data mem_res[2]
+#define video_ram     mem_res[0]
+#define kernel_code   mem_res[1]
+#define kernel_rodata mem_res[2]
+#define kernel_data   mem_res[3]
 
 static struct resource io_res[] = {
 	{
@@ -866,7 +873,9 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 	u64 i;
 
 	kernel_code.start   = virt_to_phys(_stext);
-	kernel_code.end     = virt_to_phys(__init_begin - 1);
+	kernel_code.end     = virt_to_phys(_etext - 1);
+	kernel_rodata.start = virt_to_phys(__start_rodata);
+	kernel_rodata.end   = virt_to_phys(__end_rodata - 1);
 	kernel_data.start   = virt_to_phys(_sdata);
 	kernel_data.end     = virt_to_phys(_end - 1);
 
@@ -912,6 +921,9 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 		if (kernel_code.start >= res->start &&
 		    kernel_code.end <= res->end)
 			request_resource(res, &kernel_code);
+		if (kernel_rodata.start >= res->start &&
+		    kernel_rodata.end <= res->end)
+			request_resource(res, &kernel_rodata);
 		if (kernel_data.start >= res->start &&
 		    kernel_data.end <= res->end)
 			request_resource(res, &kernel_data);
-- 
2.7.4