kill uaccess_try()
finally Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
b87df65944
commit
cf122cfba5
@ -337,10 +337,4 @@ pointer which points to one of:
|
||||
entry->insn. It is used to distinguish page faults from machine
|
||||
check.
|
||||
|
||||
3) ``int ex_handler_ext(const struct exception_table_entry *fixup)``
|
||||
This case is used for uaccess_err ... we need to set a flag
|
||||
in the task structure. Before the handler functions existed this
|
||||
case was handled by adding a large offset to the fixup to tag
|
||||
it as special.
|
||||
|
||||
More functions can easily be added.
|
||||
|
||||
@ -138,9 +138,6 @@
|
||||
# define _ASM_EXTABLE_FAULT(from, to) \
|
||||
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
|
||||
|
||||
# define _ASM_EXTABLE_EX(from, to) \
|
||||
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
|
||||
|
||||
# define _ASM_NOKPROBE(entry) \
|
||||
.pushsection "_kprobe_blacklist","aw" ; \
|
||||
_ASM_ALIGN ; \
|
||||
@ -166,9 +163,6 @@
|
||||
# define _ASM_EXTABLE_FAULT(from, to) \
|
||||
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
|
||||
|
||||
# define _ASM_EXTABLE_EX(from, to) \
|
||||
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
|
||||
|
||||
/* For C file, we already have NOKPROBE_SYMBOL macro */
|
||||
#endif
|
||||
|
||||
|
||||
@ -541,7 +541,6 @@ struct thread_struct {
|
||||
mm_segment_t addr_limit;
|
||||
|
||||
unsigned int sig_on_uaccess_err:1;
|
||||
unsigned int uaccess_err:1; /* uaccess failed */
|
||||
|
||||
/* Floating point and extended processor state */
|
||||
struct fpu fpu;
|
||||
|
||||
@ -193,23 +193,12 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
|
||||
: : "A" (x), "r" (addr) \
|
||||
: : label)
|
||||
|
||||
#define __put_user_asm_ex_u64(x, addr) \
|
||||
asm volatile("\n" \
|
||||
"1: movl %%eax,0(%1)\n" \
|
||||
"2: movl %%edx,4(%1)\n" \
|
||||
"3:" \
|
||||
_ASM_EXTABLE_EX(1b, 2b) \
|
||||
_ASM_EXTABLE_EX(2b, 3b) \
|
||||
: : "A" (x), "r" (addr))
|
||||
|
||||
#define __put_user_x8(x, ptr, __ret_pu) \
|
||||
asm volatile("call __put_user_8" : "=a" (__ret_pu) \
|
||||
: "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
|
||||
#else
|
||||
#define __put_user_goto_u64(x, ptr, label) \
|
||||
__put_user_goto(x, ptr, "q", "", "er", label)
|
||||
#define __put_user_asm_ex_u64(x, addr) \
|
||||
__put_user_asm_ex(x, addr, "q", "", "er")
|
||||
#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
|
||||
#endif
|
||||
|
||||
@ -289,31 +278,6 @@ do { \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
/*
|
||||
* This doesn't do __uaccess_begin/end - the exception handling
|
||||
* around it must do that.
|
||||
*/
|
||||
#define __put_user_size_ex(x, ptr, size) \
|
||||
do { \
|
||||
__chk_user_ptr(ptr); \
|
||||
switch (size) { \
|
||||
case 1: \
|
||||
__put_user_asm_ex(x, ptr, "b", "b", "iq"); \
|
||||
break; \
|
||||
case 2: \
|
||||
__put_user_asm_ex(x, ptr, "w", "w", "ir"); \
|
||||
break; \
|
||||
case 4: \
|
||||
__put_user_asm_ex(x, ptr, "l", "k", "ir"); \
|
||||
break; \
|
||||
case 8: \
|
||||
__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr); \
|
||||
break; \
|
||||
default: \
|
||||
__put_user_bad(); \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
#define __get_user_asm_u64(x, ptr, retval, errret) \
|
||||
({ \
|
||||
@ -430,29 +394,6 @@ struct __large_struct { unsigned long buf[100]; };
|
||||
retval = __put_user_failed(x, addr, itype, rtype, ltype, errret); \
|
||||
} while (0)
|
||||
|
||||
#define __put_user_asm_ex(x, addr, itype, rtype, ltype) \
|
||||
asm volatile("1: mov"itype" %"rtype"0,%1\n" \
|
||||
"2:\n" \
|
||||
_ASM_EXTABLE_EX(1b, 2b) \
|
||||
: : ltype(x), "m" (__m(addr)))
|
||||
|
||||
/*
|
||||
* uaccess_try and catch
|
||||
*/
|
||||
#define uaccess_try do { \
|
||||
current->thread.uaccess_err = 0; \
|
||||
__uaccess_begin(); \
|
||||
barrier();
|
||||
|
||||
#define uaccess_try_nospec do { \
|
||||
current->thread.uaccess_err = 0; \
|
||||
__uaccess_begin_nospec(); \
|
||||
|
||||
#define uaccess_catch(err) \
|
||||
__uaccess_end(); \
|
||||
(err) |= (current->thread.uaccess_err ? -EFAULT : 0); \
|
||||
} while (0)
|
||||
|
||||
/**
|
||||
* __get_user - Get a simple variable from user space, with less checking.
|
||||
* @x: Variable to store result.
|
||||
@ -502,12 +443,6 @@ struct __large_struct { unsigned long buf[100]; };
|
||||
#define __put_user(x, ptr) \
|
||||
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
|
||||
|
||||
#define put_user_try uaccess_try
|
||||
#define put_user_catch(err) uaccess_catch(err)
|
||||
|
||||
#define put_user_ex(x, ptr) \
|
||||
__put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
|
||||
|
||||
extern unsigned long
|
||||
copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
|
||||
extern __must_check long
|
||||
|
||||
@ -80,18 +80,6 @@ __visible bool ex_handler_uaccess(const struct exception_table_entry *fixup,
|
||||
}
|
||||
EXPORT_SYMBOL(ex_handler_uaccess);
|
||||
|
||||
__visible bool ex_handler_ext(const struct exception_table_entry *fixup,
|
||||
struct pt_regs *regs, int trapnr,
|
||||
unsigned long error_code,
|
||||
unsigned long fault_addr)
|
||||
{
|
||||
/* Special hack for uaccess_err */
|
||||
current->thread.uaccess_err = 1;
|
||||
regs->ip = ex_fixup_addr(fixup);
|
||||
return true;
|
||||
}
|
||||
EXPORT_SYMBOL(ex_handler_ext);
|
||||
|
||||
__visible bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup,
|
||||
struct pt_regs *regs, int trapnr,
|
||||
unsigned long error_code,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user