[PATCH] uml: skas0 stubs now check system call return values
Change syscall-stub's data to include a "expected retval".
Stub now checks syscalls retval and aborts execution of syscall list, if
retval != expected retval.
run_syscall_stub prints the data of the failed syscall, using the data pointer
and retval written by the stub to the beginning of the stack.
one_syscall_stub is removed, to simplify code, because only some instructions
are saved by one_syscall_stub, no host-syscall.
Using the stub with additional data (modify_ldt via stub)
is prepared also.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
index 4b5fd20..6e84963 100644
--- a/arch/um/kernel/skas/tlb.c
+++ b/arch/um/kernel/skas/tlb.c
@@ -18,30 +18,31 @@
#include "os.h"
#include "tlb.h"
-static void *do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
- int finished, void *flush)
+static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
+ int finished, void **flush)
{
struct host_vm_op *op;
- int i;
+ int i, ret = 0;
- for(i = 0; i <= last; i++){
+ for(i = 0; i <= last && !ret; i++){
op = &ops[i];
switch(op->type){
case MMAP:
- flush = map(&mmu->skas.id, op->u.mmap.addr,
- op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
- op->u.mmap.x, op->u.mmap.fd,
- op->u.mmap.offset, finished, flush);
+ ret = map(&mmu->skas.id, op->u.mmap.addr,
+ op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
+ op->u.mmap.x, op->u.mmap.fd,
+ op->u.mmap.offset, finished, flush);
break;
case MUNMAP:
- flush = unmap(&mmu->skas.id, (void *) op->u.munmap.addr,
- op->u.munmap.len, finished, flush);
+ ret = unmap(&mmu->skas.id,
+ (void *) op->u.munmap.addr,
+ op->u.munmap.len, finished, flush);
break;
case MPROTECT:
- flush = protect(&mmu->skas.id, op->u.mprotect.addr,
- op->u.mprotect.len, op->u.mprotect.r,
- op->u.mprotect.w, op->u.mprotect.x,
- finished, flush);
+ ret = protect(&mmu->skas.id, op->u.mprotect.addr,
+ op->u.mprotect.len, op->u.mprotect.r,
+ op->u.mprotect.w, op->u.mprotect.x,
+ finished, flush);
break;
default:
printk("Unknown op type %d in do_ops\n", op->type);
@@ -49,7 +50,7 @@
}
}
- return flush;
+ return ret;
}
extern int proc_mm;