summaryrefslogtreecommitdiff
path: root/init
diff options
context:
space:
mode:
authorH. Peter Anvin <hpa@linux.intel.com>2014-04-29 16:46:09 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-08-07 14:30:26 -0700
commita7b854c979859471402fe4fd275d3c584ff40f8a (patch)
treee4c3db767bf2b4d58d924b3cf98a22159605444a /init
parentd6b0ea8a938e4c05a00139793a405b764e63e37b (diff)
downloadlinux-3.10-a7b854c979859471402fe4fd275d3c584ff40f8a.tar.gz
linux-3.10-a7b854c979859471402fe4fd275d3c584ff40f8a.tar.bz2
linux-3.10-a7b854c979859471402fe4fd275d3c584ff40f8a.zip
x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
commit 3891a04aafd668686239349ea58f3314ea2af86b upstream. The IRET instruction, when returning to a 16-bit segment, only restores the bottom 16 bits of the user space stack pointer. This causes some 16-bit software to break, but it also leaks kernel state to user space. We have a software workaround for that ("espfix") for the 32-bit kernel, but it relies on a nonzero stack segment base which is not available in 64-bit mode. In checkin: b3b42ac2cbae x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels we "solved" this by forbidding 16-bit segments on 64-bit kernels, with the logic that 16-bit support is crippled on 64-bit kernels anyway (no V86 support), but it turns out that people are doing stuff like running old Win16 binaries under Wine and expect it to work. This works around this by creating percpu "ministacks", each of which is mapped 2^16 times 64K apart. When we detect that the return SS is on the LDT, we copy the IRET frame to the ministack and use the relevant alias to return to userspace. The ministacks are mapped readonly, so if IRET faults we promote #GP to #DF which is an IST vector and thus has its own stack; we then do the fixup in the #DF handler. (Making #GP an IST exception would make the msr_safe functions unsafe in NMI/MC context, and quite possibly have other effects.) Special thanks to: - Andy Lutomirski, for the suggestion of using very small stack slots and copy (as opposed to map) the IRET frame there, and for the suggestion to mark them readonly and let the fault promote to #DF. - Konrad Wilk for paravirt fixup and testing. - Borislav Petkov for testing help and useful comments. Reported-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@linux.intel.com Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Andrew Lutomriski <amluto@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Dirk Hohndel <dirk@hohndel.org> Cc: Arjan van de Ven <arjan.van.de.ven@intel.com> Cc: comex <comexk@gmail.com> Cc: Alexander van Heukelum <heukelum@fastmail.fm> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index e83ac04fda9..600136515ca 100644
--- a/init/main.c
+++ b/init/main.c
@@ -606,6 +606,10 @@ asmlinkage void __init start_kernel(void)
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_enter_virtual_mode();
#endif
+#ifdef CONFIG_X86_64
+ /* Should be run before the first non-init thread is created */
+ init_espfix_bsp();
+#endif
thread_info_cache_init();
cred_init();
fork_init(totalram_pages);