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arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset 

This regset allows read/write access to a ptraced process
prctl(PR_SET_TAGGED_ADDR_CTRL) setting.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Alan Hayward <Alan.Hayward@arm.com>
Cc: Luis Machado <luis.machado@linaro.org>
Cc: Omair Javaid <omair.javaid@linaro.org>
This commit is contained in:
Catalin Marinas 2020-07-03 15:12:57 +01:00
parent 18ddbaa02b
commit 2200aa7154
2 changed files with 43 additions and 0 deletions
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42
arch/arm64/kernel/ptrace.c
View File

@ -1033,6 +1033,35 @@ static int pac_generic_keys_set(struct task_struct *target,
#endif /* CONFIG_CHECKPOINT_RESTORE */
#endif /* CONFIG_ARM64_PTR_AUTH */
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
static int tagged_addr_ctrl_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
long ctrl = get_tagged_addr_ctrl(target);
if (IS_ERR_VALUE(ctrl))
return ctrl;
return membuf_write(&to, &ctrl, sizeof(ctrl));
}
static int tagged_addr_ctrl_set(struct task_struct *target, const struct
user_regset *regset, unsigned int pos,
unsigned int count, const void *kbuf, const
void __user *ubuf)
{
int ret;
long ctrl;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl, 0, -1);
if (ret)
return ret;
return set_tagged_addr_ctrl(target, ctrl);
}
#endif
enum aarch64_regset {
REGSET_GPR,
REGSET_FPR,
@ -1052,6 +1081,9 @@ enum aarch64_regset {
REGSET_PACG_KEYS,
#endif
#endif
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
REGSET_TAGGED_ADDR_CTRL,
#endif
};
static const struct user_regset aarch64_regsets[] = {
@ -1149,6 +1181,16 @@ static const struct user_regset aarch64_regsets[] = {
},
#endif
#endif
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
[REGSET_TAGGED_ADDR_CTRL] = {
.core_note_type = NT_ARM_TAGGED_ADDR_CTRL,
.n = 1,
.size = sizeof(long),
.align = sizeof(long),
.regset_get = tagged_addr_ctrl_get,
.set = tagged_addr_ctrl_set,
},
#endif
};
static const struct user_regset_view user_aarch64_view = {

1
include/uapi/linux/elf.h
View File

@ -425,6 +425,7 @@ typedef struct elf64_shdr {
#define NT_ARM_PAC_MASK 0x406 /* ARM pointer authentication code masks */
#define NT_ARM_PACA_KEYS 0x407 /* ARM pointer authentication address keys */
#define NT_ARM_PACG_KEYS 0x408 /* ARM pointer authentication generic key */
#define NT_ARM_TAGGED_ADDR_CTRL 0x409 /* arm64 tagged address control (prctl()) */
#define NT_ARC_V2 0x600 /* ARCv2 accumulator/extra registers */
#define NT_VMCOREDD 0x700 /* Vmcore Device Dump Note */
#define NT_MIPS_DSP 0x800 /* MIPS DSP ASE registers */