AuxXxilium/linux_dsm_epyc7002
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Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull x86 SMAP fixes from Ingo Molnar:
 "Fixes for Intel SMAP support, to fix SIGSEGVs during bootup"

* 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Introduce [compat_]save_altstack_ex() to unbreak x86 SMAP
  x86, smap: Handle csum_partial_copy_*_user()
This commit is contained in:
Linus Torvalds 2013-09-04 11:08:32 -07:00
commit f357a82048
6 changed files with 46 additions and 11 deletions
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2
arch/x86/ia32/ia32_signal.c
View File

@ -457,7 +457,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
else
put_user_ex(0, &frame->uc.uc_flags);
put_user_ex(0, &frame->uc.uc_link);
err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
if (ksig->ka.sa.sa_flags & SA_RESTORER)
restorer = ksig->ka.sa.sa_restorer;

22
arch/x86/include/asm/checksum_32.h
View File

@ -49,9 +49,15 @@ static inline __wsum csum_partial_copy_from_user(const void __user *src,
int len, __wsum sum,
int *err_ptr)
{
__wsum ret;
might_sleep();
return csum_partial_copy_generic((__force void *)src, dst,
len, sum, err_ptr, NULL);
stac();
ret = csum_partial_copy_generic((__force void *)src, dst,
len, sum, err_ptr, NULL);
clac();
return ret;
}
/*
@ -176,10 +182,16 @@ static inline __wsum csum_and_copy_to_user(const void *src,
int len, __wsum sum,
int *err_ptr)
{
__wsum ret;
might_sleep();
if (access_ok(VERIFY_WRITE, dst, len))
return csum_partial_copy_generic(src, (__force void *)dst,
len, sum, NULL, err_ptr);
if (access_ok(VERIFY_WRITE, dst, len)) {
stac();
ret = csum_partial_copy_generic(src, (__force void *)dst,
len, sum, NULL, err_ptr);
clac();
return ret;
}
if (len)
*err_ptr = -EFAULT;

6
arch/x86/kernel/signal.c
View File

@ -358,7 +358,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
else
put_user_ex(0, &frame->uc.uc_flags);
put_user_ex(0, &frame->uc.uc_link);
err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
save_altstack_ex(&frame->uc.uc_stack, regs->sp);
/* Set up to return from userspace. */
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
@ -423,7 +423,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
else
put_user_ex(0, &frame->uc.uc_flags);
put_user_ex(0, &frame->uc.uc_link);
err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
save_altstack_ex(&frame->uc.uc_stack, regs->sp);
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
@ -490,7 +490,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
else
put_user_ex(0, &frame->uc.uc_flags);
put_user_ex(0, &frame->uc.uc_link);
err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
put_user_ex(0, &frame->uc.uc__pad0);
if (ksig->ka.sa.sa_flags & SA_RESTORER) {

12
arch/x86/lib/csum-wrappers_64.c
View File

@ -6,6 +6,7 @@
*/
#include <asm/checksum.h>
#include <linux/module.h>
#include <asm/smap.h>
/**
* csum_partial_copy_from_user - Copy and checksum from user space.
@ -52,8 +53,10 @@ csum_partial_copy_from_user(const void __user *src, void *dst,
len -= 2;
}
}
stac();
isum = csum_partial_copy_generic((__force const void *)src,
dst, len, isum, errp, NULL);
clac();
if (unlikely(*errp))
goto out_err;
@ -82,6 +85,8 @@ __wsum
csum_partial_copy_to_user(const void *src, void __user *dst,
int len, __wsum isum, int *errp)
{
__wsum ret;
might_sleep();
if (unlikely(!access_ok(VERIFY_WRITE, dst, len))) {
@ -105,8 +110,11 @@ csum_partial_copy_to_user(const void *src, void __user *dst,
}
*errp = 0;
return csum_partial_copy_generic(src, (void __force *)dst,
len, isum, NULL, errp);
stac();
ret = csum_partial_copy_generic(src, (void __force *)dst,
len, isum, NULL, errp);
clac();
return ret;
}
EXPORT_SYMBOL(csum_partial_copy_to_user);

7
include/linux/compat.h
View File

@ -669,6 +669,13 @@ asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
int compat_restore_altstack(const compat_stack_t __user *uss);
int __compat_save_altstack(compat_stack_t __user *, unsigned long);
#define compat_save_altstack_ex(uss, sp) do { \
compat_stack_t __user *__uss = uss; \
struct task_struct *t = current; \
put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
put_user_ex(t->sas_ss_size, &__uss->ss_size); \
} while (0);
asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval);

8
include/linux/signal.h
View File

@ -434,6 +434,14 @@ void signals_init(void);
int restore_altstack(const stack_t __user *);
int __save_altstack(stack_t __user *, unsigned long);
#define save_altstack_ex(uss, sp) do { \
stack_t __user *__uss = uss; \
struct task_struct *t = current; \
put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
put_user_ex(t->sas_ss_size, &__uss->ss_size); \
} while (0);
#ifdef CONFIG_PROC_FS
struct seq_file;
extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);