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arm64: ptrace: remove addr_limit manipulation
We transiently switch to KERNEL_DS in compat_ptrace_gethbpregs() and compat_ptrace_sethbpregs(), but in either case this is pointless as we don't perform any uaccess during this window. let's rip out the redundant addr_limit manipulation. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -1458,9 +1458,7 @@ static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
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{
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int ret;
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u32 kdata;
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mm_segment_t old_fs = get_fs();
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set_fs(KERNEL_DS);
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/* Watchpoint */
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if (num < 0) {
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ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
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@ -1471,7 +1469,6 @@ static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
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} else {
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ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
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}
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set_fs(old_fs);
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if (!ret)
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ret = put_user(kdata, data);
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@ -1484,7 +1481,6 @@ static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
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{
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int ret;
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u32 kdata = 0;
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mm_segment_t old_fs = get_fs();
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if (num == 0)
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return 0;
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@ -1493,12 +1489,10 @@ static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
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if (ret)
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return ret;
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set_fs(KERNEL_DS);
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if (num < 0)
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ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
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else
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ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
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set_fs(old_fs);
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return ret;
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}
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