aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel
diff options
context:
space:
mode:
authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-07-01 04:36:31 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-01 09:56:04 -0700
commitd882b172512758703ff8d9efb96505eaaee48d2e (patch)
tree64b61d69b4af1395b80446fbc61f0488fbaeedb3 /arch/s390/kernel
parenta581c2a4697ee264699b364399b73477af408e00 (diff)
[PATCH] s390: put sys_call_table into .rodata section and write protect it
Put s390's syscall tables into .rodata section and write protect this section to prevent misuse of it. Suggested by Arjan van de Ven <arjan@infradead.org>. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/entry.S9
-rw-r--r--arch/s390/kernel/entry64.S1
2 files changed, 7 insertions, 3 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1a434a7004e..d8948c342ca 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -228,8 +228,9 @@ sysc_do_svc:
sysc_nr_ok:
mvc SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
+ l %r8,BASED(.Lsysc_table)
tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
+ l %r8,0(%r7,%r8) # get system call addr.
bnz BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
@@ -330,9 +331,10 @@ sysc_tracesys:
basr %r14,%r1
clc SP_R2(4,%r15),BASED(.Lnr_syscalls)
bnl BASED(sysc_tracenogo)
+ l %r8,BASED(.Lsysc_table)
l %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
- l %r8,sys_call_table-system_call(%r7,%r13)
+ l %r8,0(%r7,%r8)
sysc_tracego:
lm %r3,%r6,SP_R3(%r15)
l %r2,SP_ORIG_R2(%r15)
@@ -1009,6 +1011,7 @@ cleanup_io_leave_insn:
.Ltrace: .long syscall_trace
.Lvfork: .long sys_vfork
.Lschedtail: .long schedule_tail
+.Lsysc_table: .long sys_call_table
.Lcritical_start:
.long __critical_start + 0x80000000
@@ -1017,8 +1020,8 @@ cleanup_io_leave_insn:
.Lcleanup_critical:
.long cleanup_critical
+ .section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esa
sys_call_table:
#include "syscalls.S"
#undef SYSCALL
-
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index edad6077167..1ca499fa54b 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -991,6 +991,7 @@ cleanup_io_leave_insn:
.Lcritical_end:
.quad __critical_end
+ .section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esame
sys_call_table:
#include "syscalls.S"