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whack-a-mole: no need to set_fs(USER_DS) in {start,flush}_thread()

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flush_old_exec() has already done that.  Back on 2011 a bunch of
instances like that had been kicked out, but that hadn't taken
care of then-out-of-tree architectures, obviously, and they served
as reinfection vector...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-02-23 03:21:31 -05:00
parent 9e7543e939
commit a555ad450f
6 changed files with 0 additions and 8 deletions
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2
arch/arc/kernel/process.c
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@ -155,8 +155,6 @@ int copy_thread(unsigned long clone_flags,
*/
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)
{
set_fs(USER_DS); /* user space */
regs->sp = usp;
regs->ret = pc;

1
arch/c6x/kernel/process.c
View File

@ -101,7 +101,6 @@ void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
*/
usp -= 8;
set_fs(USER_DS);
regs->pc = pc;
regs->sp = usp;
regs->tsr |= 0x40; /* set user mode */

2
arch/hexagon/kernel/process.c
View File

@ -37,8 +37,6 @@
*/
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
/* Set to run with user-mode data segmentation */
set_fs(USER_DS);
/* We want to zero all data-containing registers. Is this overkill? */
memset(regs, 0, sizeof(*regs));
/* We might want to also zero all Processor registers here */

1
arch/metag/include/asm/processor.h
View File

@ -111,7 +111,6 @@ struct thread_struct {
*/
#define start_thread(regs, pc, usp) do { \
unsigned int *argc = (unsigned int *) bprm->exec; \
set_fs(USER_DS); \
current->thread.int_depth = 1; \
/* Force this process down to user land */ \
regs->ctx.SaveMask = TBICTX_PRIV_BIT; \

1
arch/nios2/kernel/process.c
View File

@ -94,7 +94,6 @@ void show_regs(struct pt_regs *regs)
void flush_thread(void)
{
set_fs(USER_DS);
}
int copy_thread(unsigned long clone_flags,

1
arch/openrisc/kernel/process.c
View File

@ -197,7 +197,6 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
{
unsigned long sr = mfspr(SPR_SR) & ~SPR_SR_SM;
set_fs(USER_DS);
memset(regs, 0, sizeof(struct pt_regs));
regs->pc = pc;