x86-32, ftrace: Fix static ftrace when early microcode is enabled

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Early microcode loading runs C code before paging is enabled on 32
bits.  Since ftrace puts a hook into every function, that hook needs
to be safe to execute in the pre-paging environment.  This is
currently true for dynamic ftrace but not for static ftrace.

Static ftrace is obsolescent and assumed to not be
performance-critical, so we can simply test that the stack pointer
falls within the valid range of kernel addresses.

Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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H. Peter Anvin 2013-08-30 17:29:29 -07:00 • committed by Steven Rostedt

parent 59338f754a

commit af058ab04d

1 changed files with 3 additions and 0 deletions

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arch/x86/kernel/entry_32.S

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