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x86/traps, context_tracking: Assert that we're in CONTEXT_KERNEL in exception entries
Other than the super-atomic exception entries, all exception entries are supposed to switch our context tracking state to CONTEXT_KERNEL. Assert that they do. These assertions appear trivial at this point, as exception_enter() is the function responsible for switching context, but I'm planning on reworking x86's exception context tracking, and these assertions will help make sure that all of this code keeps working. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/20fa1ee2d943233a184aaf96ff75394d3b34dfba.1435952415.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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1 changed files with 9 additions and 0 deletions
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@ -292,6 +292,8 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
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enum ctx_state prev_state = exception_enter();
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siginfo_t info;
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
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NOTIFY_STOP) {
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conditional_sti(regs);
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@ -376,6 +378,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
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siginfo_t *info;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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if (notify_die(DIE_TRAP, "bounds", regs, error_code,
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X86_TRAP_BR, SIGSEGV) == NOTIFY_STOP)
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goto exit;
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@ -457,6 +460,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
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enum ctx_state prev_state;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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conditional_sti(regs);
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if (v8086_mode(regs)) {
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@ -514,6 +518,7 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)
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return;
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prev_state = ist_enter(regs);
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
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if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
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SIGTRAP) == NOTIFY_STOP)
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@ -750,6 +755,7 @@ dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
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enum ctx_state prev_state;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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math_error(regs, error_code, X86_TRAP_MF);
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exception_exit(prev_state);
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}
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@ -760,6 +766,7 @@ do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
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enum ctx_state prev_state;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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math_error(regs, error_code, X86_TRAP_XF);
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exception_exit(prev_state);
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}
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@ -776,6 +783,7 @@ do_device_not_available(struct pt_regs *regs, long error_code)
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enum ctx_state prev_state;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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BUG_ON(use_eager_fpu());
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#ifdef CONFIG_MATH_EMULATION
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@ -805,6 +813,7 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
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enum ctx_state prev_state;
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prev_state = exception_enter();
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CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
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local_irq_enable();
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info.si_signo = SIGILL;
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