diff options
Diffstat (limited to 'arch/arm64/mm/extable.c')
| -rw-r--r-- | arch/arm64/mm/extable.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c index c2951b963335..bbbc95313f2e 100644 --- a/arch/arm64/mm/extable.c +++ b/arch/arm64/mm/extable.c @@ -3,10 +3,12 @@ * Based on arch/arm/mm/extable.c */ +#include <linux/bitfield.h> #include <linux/extable.h> #include <linux/uaccess.h> #include <asm/asm-extable.h> +#include <asm/ptrace.h> typedef bool (*ex_handler_t)(const struct exception_table_entry *, struct pt_regs *); @@ -24,6 +26,19 @@ static bool ex_handler_fixup(const struct exception_table_entry *ex, return true; } +static bool ex_handler_uaccess_err_zero(const struct exception_table_entry *ex, + struct pt_regs *regs) +{ + int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data); + int reg_zero = FIELD_GET(EX_DATA_REG_ZERO, ex->data); + + pt_regs_write_reg(regs, reg_err, -EFAULT); + pt_regs_write_reg(regs, reg_zero, 0); + + regs->pc = get_ex_fixup(ex); + return true; +} + bool fixup_exception(struct pt_regs *regs) { const struct exception_table_entry *ex; @@ -37,6 +52,8 @@ bool fixup_exception(struct pt_regs *regs) return ex_handler_fixup(ex, regs); case EX_TYPE_BPF: return ex_handler_bpf(ex, regs); + case EX_TYPE_UACCESS_ERR_ZERO: + return ex_handler_uaccess_err_zero(ex, regs); } BUG(); |