Commit-ID: 02fdcd5eac9d653d1addbd69b0c58d73650e1c00 Gitweb: http://git.kernel.org/tip/02fdcd5eac9d653d1addbd69b0c58d73650e1c00 Author: Andy Lutomirski <l...@kernel.org> AuthorDate: Fri, 3 Jul 2015 12:44:24 -0700 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 7 Jul 2015 10:59:05 +0200
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 <l...@kernel.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: Denys Vlasenko <vda.li...@googlemail.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Kees Cook <keesc...@chromium.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Oleg Nesterov <o...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: paul...@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/20fa1ee2d943233a184aaf96ff75394d3b34dfba.1435952415.git.l...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/kernel/traps.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index f579192..2a783c4 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -292,6 +292,8 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str, enum ctx_state prev_state = exception_enter(); siginfo_t info; + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); + if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) != NOTIFY_STOP) { conditional_sti(regs); @@ -376,6 +378,7 @@ dotraplinkage void do_bounds(struct pt_regs *regs, long error_code) siginfo_t *info; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); if (notify_die(DIE_TRAP, "bounds", regs, error_code, X86_TRAP_BR, SIGSEGV) == NOTIFY_STOP) goto exit; @@ -457,6 +460,7 @@ do_general_protection(struct pt_regs *regs, long error_code) enum ctx_state prev_state; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); conditional_sti(regs); if (v8086_mode(regs)) { @@ -514,6 +518,7 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code) return; prev_state = ist_enter(regs); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP, SIGTRAP) == NOTIFY_STOP) @@ -750,6 +755,7 @@ dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code) enum ctx_state prev_state; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); math_error(regs, error_code, X86_TRAP_MF); exception_exit(prev_state); } @@ -760,6 +766,7 @@ do_simd_coprocessor_error(struct pt_regs *regs, long error_code) enum ctx_state prev_state; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); math_error(regs, error_code, X86_TRAP_XF); exception_exit(prev_state); } @@ -776,6 +783,7 @@ do_device_not_available(struct pt_regs *regs, long error_code) enum ctx_state prev_state; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); BUG_ON(use_eager_fpu()); #ifdef CONFIG_MATH_EMULATION @@ -805,6 +813,7 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code) enum ctx_state prev_state; prev_state = exception_enter(); + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); local_irq_enable(); info.si_signo = SIGILL; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
