Commit c280f773 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar

Revert "x86/unwind: Detect bad stack return address"

Revert the following commit:

  b6959a36 ("x86/unwind: Detect bad stack return address")

... because Andrey Konovalov reported an unwinder warning:

  WARNING: unrecognized kernel stack return address ffffffffa0000001 at ffff88006377fa18 in a.out:4467

The unwind was initiated from an interrupt which occurred while running in the
generated code for a kprobe.  The unwinder printed the warning because it
expected regs->ip to point to a valid text address, but instead it pointed to
the generated code.

Eventually we may want come up with a way to identify generated kprobe
code so the unwinder can know that it's a valid return address.  Until
then, just remove the warning.
Reported-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/02f296848fbf49fb72dfeea706413ecbd9d4caf6.1482418739.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent cef4402d
...@@ -51,16 +51,7 @@ unsigned long unwind_get_return_address(struct unwind_state *state) ...@@ -51,16 +51,7 @@ unsigned long unwind_get_return_address(struct unwind_state *state)
addr = ftrace_graph_ret_addr(state->task, &state->graph_idx, *addr_p, addr = ftrace_graph_ret_addr(state->task, &state->graph_idx, *addr_p,
addr_p); addr_p);
if (!__kernel_text_address(addr)) { return __kernel_text_address(addr) ? addr : 0;
printk_deferred_once(KERN_WARNING
"WARNING: unrecognized kernel stack return address %p at %p in %s:%d\n",
(void *)addr, addr_p, state->task->comm,
state->task->pid);
unwind_dump(state, addr_p);
return 0;
}
return addr;
} }
EXPORT_SYMBOL_GPL(unwind_get_return_address); EXPORT_SYMBOL_GPL(unwind_get_return_address);
......
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