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[PATCH] uml: use correct register file size everywhere 

This patch uses MAX_REG_NR consistently to refer to the register file size.
 FRAME_SIZE isn't sufficient because on x86_64, it is smaller than the
ptrace register file size.  MAX_REG_NR was introduced as a consistent way
to get the number of registers, but wasn't used everywhere it should be.

When this causes a problem, it makes PTRACE_SETREGS fail on x86_64 because
of a corrupted segment register value in the known-good register file.  The
patch also adds a register dump at that point in case there are any future
problems here.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-03-26 21:32:25 -08:00 committed by Linus Torvalds
parent 7632fc8f80
commit b92c4f922b
5 changed files with 15 additions and 14 deletions
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4
arch/um/include/sysdep-x86_64/ptrace.h
View File

@ -104,10 +104,6 @@ union uml_pt_regs {
#endif
#ifdef UML_CONFIG_MODE_SKAS
struct skas_regs {
/* x86_64 ptrace uses sizeof(user_regs_struct) as its register
* file size, while i386 uses FRAME_SIZE. Therefore, we need
* to use UM_FRAME_SIZE here instead of HOST_FRAME_SIZE.
*/
unsigned long regs[MAX_REG_NR];
unsigned long fp[HOST_FP_SIZE];
struct faultinfo faultinfo;

10
arch/um/os-Linux/skas/mem.c
View File

@ -48,7 +48,7 @@ int multi_op_count = 0;
static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
{
unsigned long regs[MAX_REG_NR];
int n;
int n, i;
long ret, offset;
unsigned long * data;
unsigned long * syscall;
@ -66,9 +66,13 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
(unsigned long) &__syscall_stub_start);
n = ptrace_setregs(pid, regs);
if(n < 0)
if(n < 0){
printk("Registers - \n");
for(i = 0; i < MAX_REG_NR; i++)
printk("\t%d\t0x%lx\n", i, regs[i]);
panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
n);
-n);
}
wait_stub_done(pid, 0, "do_syscall_stub");

6
arch/um/os-Linux/skas/process.c
View File

@ -67,7 +67,7 @@ void wait_stub_done(int pid, int sig, char * fname)
if((n < 0) || !WIFSTOPPED(status) ||
(WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
unsigned long regs[HOST_FRAME_SIZE];
unsigned long regs[MAX_REG_NR];
if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
printk("Failed to get registers from stub, "
@ -76,7 +76,7 @@ void wait_stub_done(int pid, int sig, char * fname)
int i;
printk("Stub registers -\n");
for(i = 0; i < HOST_FRAME_SIZE; i++)
for(i = 0; i < ARRAY_SIZE(regs); i++)
printk("\t%d - %lx\n", i, regs[i]);
}
panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
@ -328,7 +328,7 @@ void userspace(union uml_pt_regs *regs)
int copy_context_skas0(unsigned long new_stack, int pid)
{
int err;
unsigned long regs[HOST_FRAME_SIZE];
unsigned long regs[MAX_REG_NR];
unsigned long fp_regs[HOST_FP_SIZE];
unsigned long current_stack = current_stub_stack();
struct stub_data *data = (struct stub_data *) current_stack;

5
arch/um/os-Linux/sys-i386/registers.c
View File

@ -15,7 +15,7 @@
/* These are set once at boot time and not changed thereafter */
static unsigned long exec_regs[HOST_FRAME_SIZE];
static unsigned long exec_regs[MAX_REG_NR];
static unsigned long exec_fp_regs[HOST_FP_SIZE];
static unsigned long exec_fpx_regs[HOST_XFP_SIZE];
static int have_fpx_regs = 1;
@ -101,6 +101,7 @@ void init_registers(int pid)
{
int err;
memset(exec_regs, 0, sizeof(exec_regs));
err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
if(err)
panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
@ -124,7 +125,7 @@ void init_registers(int pid)
void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
{
memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
memcpy(regs, exec_regs, sizeof(exec_regs));
if(fp_regs != NULL)
memcpy(fp_regs, exec_fp_regs,
HOST_FP_SIZE * sizeof(unsigned long));

4
arch/um/os-Linux/sys-x86_64/registers.c
View File

@ -14,7 +14,7 @@
/* These are set once at boot time and not changed thereafter */
static unsigned long exec_regs[HOST_FRAME_SIZE];
static unsigned long exec_regs[MAX_REG_NR];
static unsigned long exec_fp_regs[HOST_FP_SIZE];
void init_thread_registers(union uml_pt_regs *to)
@ -72,7 +72,7 @@ void init_registers(int pid)
void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
{
memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
memcpy(regs, exec_regs, sizeof(exec_regs));
if(fp_regs != NULL)
memcpy(fp_regs, exec_fp_regs,
HOST_FP_SIZE * sizeof(unsigned long));