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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-02-05 21:18:41 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:41 +0100
commit162e006ef59266b9ebf34e3d15ca1f3d9ee956d7 (patch)
treed7f1b61fbe822e71867bd04ee4ee7f3f1cd20842
parentab14de6c37fae22911ba99f4171613e6d758050b (diff)
downloadop-kernel-dev-162e006ef59266b9ebf34e3d15ca1f3d9ee956d7.zip
op-kernel-dev-162e006ef59266b9ebf34e3d15ca1f3d9ee956d7.tar.gz
[S390] Mark kernel text section read-only.
Set read-only flag in the page table entries for the kernel image text section. This will catch all instruction caused corruptions withing the text section. Instruction replacement via kprobes still works, since it bypasses now dynamic address translation. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/early.c1
-rw-r--r--arch/s390/kernel/kprobes.c27
-rw-r--r--arch/s390/kernel/vmlinux.lds.S3
-rw-r--r--arch/s390/mm/init.c9
-rw-r--r--include/asm-s390/sections.h2
5 files changed, 31 insertions, 11 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 40dd479..e518dd5 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -27,7 +27,6 @@
#define DEFSYS_CMD_SIZE 96
#define SAVESYS_CMD_SIZE 32
-extern int _eshared;
char kernel_nss_name[NSS_NAME_SIZE + 1];
#ifdef CONFIG_SHARED_KERNEL
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index b2e1dc8..a466bab 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -155,15 +155,34 @@ void __kprobes get_instruction_type(struct arch_specific_insn *ainsn)
static int __kprobes swap_instruction(void *aref)
{
struct ins_replace_args *args = aref;
+ u32 *addr;
+ u32 instr;
int err = -EFAULT;
+ /*
+ * Text segment is read-only, hence we use stura to bypass dynamic
+ * address translation to exchange the instruction. Since stura
+ * always operates on four bytes, but we only want to exchange two
+ * bytes do some calculations to get things right. In addition we
+ * shall not cross any page boundaries (vmalloc area!) when writing
+ * the new instruction.
+ */
+ addr = (u32 *)ALIGN((unsigned long)args->ptr, 4);
+ if ((unsigned long)args->ptr & 2)
+ instr = ((*addr) & 0xffff0000) | args->new;
+ else
+ instr = ((*addr) & 0x0000ffff) | args->new << 16;
+
asm volatile(
- "0: mvc 0(2,%2),0(%3)\n"
- "1: la %0,0\n"
+ " lra %1,0(%1)\n"
+ "0: stura %2,%1\n"
+ "1: la %0,0\n"
"2:\n"
EX_TABLE(0b,2b)
- : "+d" (err), "=m" (*args->ptr)
- : "a" (args->ptr), "a" (&args->new), "m" (args->new));
+ : "+d" (err)
+ : "a" (addr), "d" (instr)
+ : "memory", "cc");
+
return err;
}
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 8fedb1f..a489073 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -35,9 +35,10 @@ SECTIONS
#ifdef CONFIG_SHARED_KERNEL
. = ALIGN(1048576); /* VM shared segments are 1MB aligned */
+#endif
+ . = ALIGN(4096);
_eshared = .; /* End of shareable data */
-#endif
. = ALIGN(16); /* Exception table */
__start___ex_table = .;
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 162a338..b3e7c45 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -26,7 +26,6 @@
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
-
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -96,8 +95,8 @@ static void __init setup_ro_region(void)
pte_t new_pte;
unsigned long address, end;
- address = ((unsigned long)&__start_rodata) & PAGE_MASK;
- end = PFN_ALIGN((unsigned long)&__end_rodata);
+ address = ((unsigned long)&_stext) & PAGE_MASK;
+ end = PFN_ALIGN((unsigned long)&_eshared);
for (; address < end; address += PAGE_SIZE) {
pgd = pgd_offset_k(address);
@@ -173,8 +172,8 @@ void __init mem_init(void)
datasize >>10,
initsize >> 10);
printk("Write protected kernel read-only data: %#lx - %#lx\n",
- (unsigned long)&__start_rodata,
- PFN_ALIGN((unsigned long)&__end_rodata) - 1);
+ (unsigned long)&_stext,
+ PFN_ALIGN((unsigned long)&_eshared) - 1);
}
void free_initmem(void)
diff --git a/include/asm-s390/sections.h b/include/asm-s390/sections.h
index 3a0b8ff..1c5a2c4 100644
--- a/include/asm-s390/sections.h
+++ b/include/asm-s390/sections.h
@@ -3,4 +3,6 @@
#include <asm-generic/sections.h>
+extern char _eshared[];
+
#endif
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