https://github.com/torvalds/linux
Revision a9cdbe72c4e8bf3b38781c317a79326e2e1a230d authored by Josh Poimboeuf on 31 December 2017, 16:18:06 UTC, committed by Ingo Molnar on 03 January 2018, 15:14:46 UTC
The show_regs_safe() logic is wrong. When there's an iret stack frame, it prints the entire pt_regs -- most of which is random stack data -- instead of just the five registers at the end. show_regs_safe() is also poorly named: the on_stack() checks aren't for safety. Rename the function to show_regs_if_on_stack() and add a comment to explain why the checks are needed. These issues were introduced with the "partial register dump" feature of the following commit: b02fcf9ba121 ("x86/unwinder: Handle stack overflows more gracefully") That patch had gone through a few iterations of development, and the above issues were artifacts from a previous iteration of the patch where 'regs' pointed directly to the iret frame rather than to the (partially empty) pt_regs. Tested-by: Alexander Tsoy <alexander@tsoy.me> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Toralf Förster <toralf.foerster@gmx.de> Cc: stable@vger.kernel.org Fixes: b02fcf9ba121 ("x86/unwinder: Handle stack overflows more gracefully") Link: http://lkml.kernel.org/r/5b05b8b344f59db2d3d50dbdeba92d60f2304c54.1514736742.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 52994c2
Tip revision: a9cdbe72c4e8bf3b38781c317a79326e2e1a230d authored by Josh Poimboeuf on 31 December 2017, 16:18:06 UTC
x86/dumpstack: Fix partial register dumps
x86/dumpstack: Fix partial register dumps
Tip revision: a9cdbe7
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Makefile | -rw-r--r-- | 58.4 KB |
README | -rw-r--r-- | 722 bytes |
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