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powerpc: Fix DAR reporting when alignment handler faults 

Anton noticed that if we fault part way through emulating an unaligned
instruction, we don't update the DAR to reflect that.

The DAR value is eventually reported back to userspace as the address
in the SEGV signal, and if userspace is using that value to demand
fault then it can be confused by us not setting the value correctly.

This patch is ugly as hell, but is intended to be the minimal fix and
back ports easily.

Cc: stable@vger.kernel.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Michael Ellerman 2017-08-24 20:49:57 +10:00
parent afb5519fdb
commit f9effe9250
1 changed files with 74 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
arch/powerpc/kernel/align.c
View File

@ -235,6 +235,28 @@ static int emulate_dcbz(struct pt_regs *regs, unsigned char __user *addr)
#define SWIZ_PTR(p) ((unsigned char __user *)((p) ^ swiz))
#define __get_user_or_set_dar(_regs, _dest, _addr) \
({ \
int rc = 0; \
typeof(_addr) __addr = (_addr); \
if (__get_user_inatomic(_dest, __addr)) { \
_regs->dar = (unsigned long)__addr; \
rc = -EFAULT; \
} \
rc; \
})
#define __put_user_or_set_dar(_regs, _src, _addr) \
({ \
int rc = 0; \
typeof(_addr) __addr = (_addr); \
if (__put_user_inatomic(_src, __addr)) { \
_regs->dar = (unsigned long)__addr; \
rc = -EFAULT; \
} \
rc; \
})
static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
unsigned int reg, unsigned int nb,
unsigned int flags, unsigned int instr,
@ -263,9 +285,10 @@ static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
} else {
unsigned long pc = regs->nip ^ (swiz & 4);
if (__get_user_inatomic(instr,
(unsigned int __user *)pc))
if (__get_user_or_set_dar(regs, instr,
(unsigned int __user *)pc))
return -EFAULT;
if (swiz == 0 && (flags & SW))
instr = cpu_to_le32(instr);
nb = (instr >> 11) & 0x1f;
@ -309,31 +332,31 @@ static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
((nb0 + 3) / 4) * sizeof(unsigned long));
for (i = 0; i < nb; ++i, ++p)
if (__get_user_inatomic(REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
if (__get_user_or_set_dar(regs, REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
return -EFAULT;
if (nb0 > 0) {
rptr = &regs->gpr[0];
addr += nb;
for (i = 0; i < nb0; ++i, ++p)
if (__get_user_inatomic(REG_BYTE(rptr,
i ^ bswiz),
SWIZ_PTR(p)))
if (__get_user_or_set_dar(regs,
REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
return -EFAULT;
}
} else {
for (i = 0; i < nb; ++i, ++p)
if (__put_user_inatomic(REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
if (__put_user_or_set_dar(regs, REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
return -EFAULT;
if (nb0 > 0) {
rptr = &regs->gpr[0];
addr += nb;
for (i = 0; i < nb0; ++i, ++p)
if (__put_user_inatomic(REG_BYTE(rptr,
i ^ bswiz),
SWIZ_PTR(p)))
if (__put_user_or_set_dar(regs,
REG_BYTE(rptr, i ^ bswiz),
SWIZ_PTR(p)))
return -EFAULT;
}
}
@ -345,29 +368,32 @@ static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
* Only POWER6 has these instructions, and it does true little-endian,
* so we don't need the address swizzling.
*/
static int emulate_fp_pair(unsigned char __user *addr, unsigned int reg,
unsigned int flags)
static int emulate_fp_pair(struct pt_regs *regs, unsigned char __user *addr,
unsigned int reg, unsigned int flags)
{
char *ptr0 = (char *) &current->thread.TS_FPR(reg);
char *ptr1 = (char *) &current->thread.TS_FPR(reg+1);
int i, ret, sw = 0;
int i, sw = 0;
if (reg & 1)
return 0; /* invalid form: FRS/FRT must be even */
if (flags & SW)
sw = 7;
ret = 0;
for (i = 0; i < 8; ++i) {
if (!(flags & ST)) {
ret |= __get_user(ptr0[i^sw], addr + i);
ret |= __get_user(ptr1[i^sw], addr + i + 8);
if (__get_user_or_set_dar(regs, ptr0[i^sw], addr + i))
return -EFAULT;
if (__get_user_or_set_dar(regs, ptr1[i^sw], addr + i + 8))
return -EFAULT;
} else {
ret |= __put_user(ptr0[i^sw], addr + i);
ret |= __put_user(ptr1[i^sw], addr + i + 8);
if (__put_user_or_set_dar(regs, ptr0[i^sw], addr + i))
return -EFAULT;
if (__put_user_or_set_dar(regs, ptr1[i^sw], addr + i + 8))
return -EFAULT;
}
}
if (ret)
return -EFAULT;
return 1; /* exception handled and fixed up */
}
@ -377,24 +403,27 @@ static int emulate_lq_stq(struct pt_regs *regs, unsigned char __user *addr,
{
char *ptr0 = (char *)&regs->gpr[reg];
char *ptr1 = (char *)&regs->gpr[reg+1];
int i, ret, sw = 0;
int i, sw = 0;
if (reg & 1)
return 0; /* invalid form: GPR must be even */
if (flags & SW)
sw = 7;
ret = 0;
for (i = 0; i < 8; ++i) {
if (!(flags & ST)) {
ret |= __get_user(ptr0[i^sw], addr + i);
ret |= __get_user(ptr1[i^sw], addr + i + 8);
if (__get_user_or_set_dar(regs, ptr0[i^sw], addr + i))
return -EFAULT;
if (__get_user_or_set_dar(regs, ptr1[i^sw], addr + i + 8))
return -EFAULT;
} else {
ret |= __put_user(ptr0[i^sw], addr + i);
ret |= __put_user(ptr1[i^sw], addr + i + 8);
if (__put_user_or_set_dar(regs, ptr0[i^sw], addr + i))
return -EFAULT;
if (__put_user_or_set_dar(regs, ptr1[i^sw], addr + i + 8))
return -EFAULT;
}
}
if (ret)
return -EFAULT;
return 1; /* exception handled and fixed up */
}
#endif /* CONFIG_PPC64 */
@ -687,9 +716,14 @@ static int emulate_vsx(unsigned char __user *addr, unsigned int reg,
for (j = 0; j < length; j += elsize) {
for (i = 0; i < elsize; ++i) {
if (flags & ST)
ret |= __put_user(ptr[i^sw], addr + i);
ret = __put_user_or_set_dar(regs, ptr[i^sw],
addr + i);
else
ret |= __get_user(ptr[i^sw], addr + i);
ret = __get_user_or_set_dar(regs, ptr[i^sw],
addr + i);
if (ret)
return ret;
}
ptr += elsize;
#ifdef __LITTLE_ENDIAN__
@ -739,7 +773,7 @@ int fix_alignment(struct pt_regs *regs)
unsigned int dsisr;
unsigned char __user *addr;
unsigned long p, swiz;
int ret, i;
int i;
union data {
u64 ll;
double dd;
@ -936,7 +970,7 @@ int fix_alignment(struct pt_regs *regs)
if (flags & F) {
/* Special case for 16-byte FP loads and stores */
PPC_WARN_ALIGNMENT(fp_pair, regs);
return emulate_fp_pair(addr, reg, flags);
return emulate_fp_pair(regs, addr, reg, flags);
} else {
#ifdef CONFIG_PPC64
/* Special case for 16-byte loads and stores */
@ -966,15 +1000,12 @@ int fix_alignment(struct pt_regs *regs)
}
data.ll = 0;
ret = 0;
p = (unsigned long)addr;
for (i = 0; i < nb; i++)
ret |= __get_user_inatomic(data.v[start + i],
SWIZ_PTR(p++));
if (unlikely(ret))
return -EFAULT;
if (__get_user_or_set_dar(regs, data.v[start + i],
SWIZ_PTR(p++)))
return -EFAULT;
} else if (flags & F) {
data.ll = current->thread.TS_FPR(reg);
@ -1046,15 +1077,13 @@ int fix_alignment(struct pt_regs *regs)
break;
}
ret = 0;
p = (unsigned long)addr;
for (i = 0; i < nb; i++)
ret |= __put_user_inatomic(data.v[start + i],
SWIZ_PTR(p++));
if (__put_user_or_set_dar(regs, data.v[start + i],
SWIZ_PTR(p++)))
return -EFAULT;
if (unlikely(ret))
return -EFAULT;
} else if (flags & F)
current->thread.TS_FPR(reg) = data.ll;
else