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f2dceb474b
- Validate any stack addresses read from against td_kstack before reading. If an unwind operation would attempt to read outside the bounds of td_kstack, abort the unwind instead. - For stack_save_td(), don't use the PC and SP from the current thread, instead read the PC and SP from pcb_context[]. - For stack_save(), use the current PC and SP of the current thread, not the values from pcb_regs (the horribly named td_frame of the outermost trapframe). The result was that stack_trace() never logged _any_ kernel frames but only the frame from the saved userspace registers on entry from the kernel. - Inline the one use of stack_register_fetch(). - Add a VALID_PC() helper macro and simplify types to remove excessive casts in stack_capture(). - Fix stack_capture() to work on compilers written in this century. Don't treat function epilogues as function prologues by skipping additions to SP when searching for a function start. - Add some comments to stack_capture() and fix some style bugs. Reviewed by: arichardson Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27358 |
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