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Date: Mon, 2 May 2011 22:25:07 GMT From: "tip-bot for H. Peter Anvin" <hpa@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com, alexey.zaytsev@...il.com, tglx@...utronix.de Subject: [tip:x86/urgent] x86, reboot: Fix relocations in reboot_32.S Commit-ID: 7806a49ab625ebeb1709e5e87299b64932b807a7 Gitweb: http://git.kernel.org/tip/7806a49ab625ebeb1709e5e87299b64932b807a7 Author: H. Peter Anvin <hpa@...or.com> AuthorDate: Mon, 2 May 2011 14:33:24 -0700 Committer: H. Peter Anvin <hpa@...or.com> CommitDate: Mon, 2 May 2011 14:44:46 -0700 x86, reboot: Fix relocations in reboot_32.S The use of base for %ebx in this file is arbitrary, *except* that we also use it to compute the real-mode segment. Therefore, make it so that r_base really is the true address to which %ebx points. This resolves kernel bugzilla 33302. Reported-and-tested-by: Alexey Zaytsev <alexey.zaytsev@...il.com> Signed-off-by: H. Peter Anvin <hpa@...or.com> Link: http://lkml.kernel.org/n/tip-08os5wi3yq1no0y4i5m4z7he@git.kernel.org --- arch/x86/kernel/reboot_32.S | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/reboot_32.S b/arch/x86/kernel/reboot_32.S index 29092b3..1d5c46d 100644 --- a/arch/x86/kernel/reboot_32.S +++ b/arch/x86/kernel/reboot_32.S @@ -21,26 +21,26 @@ r_base = . /* Get our own relocated address */ call 1f 1: popl %ebx - subl $1b, %ebx + subl $(1b - r_base), %ebx /* Compute the equivalent real-mode segment */ movl %ebx, %ecx shrl $4, %ecx /* Patch post-real-mode segment jump */ - movw dispatch_table(%ebx,%eax,2),%ax - movw %ax, 101f(%ebx) - movw %cx, 102f(%ebx) + movw (dispatch_table - r_base)(%ebx,%eax,2),%ax + movw %ax, (101f - r_base)(%ebx) + movw %cx, (102f - r_base)(%ebx) /* Set up the IDT for real mode. */ - lidtl machine_real_restart_idt(%ebx) + lidtl (machine_real_restart_idt - r_base)(%ebx) /* * Set up a GDT from which we can load segment descriptors for real * mode. The GDT is not used in real mode; it is just needed here to * prepare the descriptors. */ - lgdtl machine_real_restart_gdt(%ebx) + lgdtl (machine_real_restart_gdt - r_base)(%ebx) /* * Load the data segment registers with 16-bit compatible values -- 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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