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[PATCH] uml: skas0 stubs now check system call return values

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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>
This commit is contained in:
Bodo Stroesser
2005-09-03 15:57:50 -07:00
committed by Linus Torvalds
parent 8b51304ed3
commit 07bf731e4b
8 changed files with 354 additions and 244 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
arch/um/kernel/skas/tlb.c
View File

@ -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 @@ static void *do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
}
}
return flush;
return ret;
}
extern int proc_mm;