tag name | x86-urgent-2020-11-01 (3e25726ada7322bf7c9d2635bfc61e6a347044d1) |
tag date | 2020-11-01 14:55:35 +0100 |
tagged by | Thomas Gleixner <tglx@linutronix.de> |
tagged object | commit cb05143bdf... |
Three fixes all related to #DB:
- Handle the BTF bit correctly so it doesn't get lost due to a kernel #DB
- Only clear and set the virtual DR6 value used by ptrace on user space
triggered #DB. A kernel #DB must leave it alone to ensure data
consistency for ptrace.
- Make the bitmasking of the virtual DR6 storage correct so it does not
lose DR_STEP.
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