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Date: Wed, 2 Dec 2015 14:53:23 -0800 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Krzysztof Mazur <krzysiek@...lesie.net>, Andy Lutomirski <luto@...capital.net>, Borislav Petkov <bp@...en8.de>, Laszlo Ersek <lersek@...hat.com>, Matt Fleming <matt.fleming@...el.com>, Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.13.y-ckt 02/86] x86/setup: Fix low identity map for >= 2GB kernel range 3.13.11-ckt31 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Krzysztof Mazur <krzysiek@...lesie.net> commit 68accac392d859d24adcf1be3a90e41f978bd54c upstream. The commit f5f3497cad8c extended the low identity mapping. However, if the kernel uses more than 2 GB (VMSPLIT_2G_OPT or VMSPLIT_1G memory split), the normal memory mapping is overwritten by the low identity mapping causing a crash. To avoid overwritting, limit the low identity map to cover only memory before kernel range (PAGE_OFFSET). Fixes: f5f3497cad8c "x86/setup: Extend low identity map to cover whole kernel range Signed-off-by: Krzysztof Mazur <krzysiek@...lesie.net> Cc: Andy Lutomirski <luto@...capital.net> Cc: Borislav Petkov <bp@...en8.de> Cc: Laszlo Ersek <lersek@...hat.com> Cc: Matt Fleming <matt.fleming@...el.com> Cc: Paolo Bonzini <pbonzini@...hat.com> Link: http://lkml.kernel.org/r/1446815916-22105-1-git-send-email-krzysiek@podlesie.net Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- arch/x86/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 29458d3..2082662 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1167,7 +1167,7 @@ void __init setup_arch(char **cmdline_p) */ clone_pgd_range(initial_page_table, swapper_pg_dir + KERNEL_PGD_BOUNDARY, - KERNEL_PGD_PTRS); + min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY)); #endif tboot_probe(); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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