kprobes/x86: Fix kernel panic when certain exception-handling addresses are probed

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commit 75013fb16f upstream.

Fix to the exception table entry check by using probed address
instead of the address of copied instruction.

This bug may cause unexpected kernel panic if user probe an address
where an exception can happen which should be fixup by __ex_table
(e.g. copy_from_user.)

Unless user puts a kprobe on such address, this doesn't
cause any problem.

This bug has been introduced years ago, by commit:

  464846888d ("x86/kprobes: Fix a bug which can modify kernel code permanently").

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 464846888d ("x86/kprobes: Fix a bug which can modify kernel code permanently")
Link: http://lkml.kernel.org/r/148829899399.28855.12581062400757221722.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Masami Hiramatsu 2017-03-01 01:23:24 +09:00 • committed by Ben Hutchings

parent e57d94724b

commit 9b3026f294

3 changed files with 5 additions and 5 deletions

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2

arch/x86/kernel/kprobes/common.h

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6

arch/x86/kernel/kprobes/core.c

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2

arch/x86/kernel/kprobes/opt.c

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