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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-26 10:12:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-26 10:12:28 -0800 |
| commit | 5c4a1c090d8676d8b84e2ac40671602be44afdfc (patch) | |
| tree | 1fc8c456266e37a7e5c2e584eeed546587142da0 /arch/x86/kernel | |
| parent | Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| parent | x86/entry/32: Fix FIXUP_ESPFIX_STACK with user CR3 (diff) | |
| download | linux-dev-5c4a1c090d8676d8b84e2ac40671602be44afdfc.tar.xz linux-dev-5c4a1c090d8676d8b84e2ac40671602be44afdfc.zip | |
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"These are the fixes left over from the v5.4 cycle:
- Various low level 32-bit entry code fixes and improvements by Andy
Lutomirski, Peter Zijlstra and Thomas Gleixner.
- Fix 32-bit Xen PV breakage, by Jan Beulich"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/entry/32: Fix FIXUP_ESPFIX_STACK with user CR3
x86/pti/32: Calculate the various PTI cpu_entry_area sizes correctly, make the CPU_ENTRY_AREA_PAGES assert precise
selftests/x86/sigreturn/32: Invalidate DS and ES when abusing the kernel
selftests/x86/mov_ss_trap: Fix the SYSENTER test
x86/entry/32: Fix NMI vs ESPFIX
x86/entry/32: Unwind the ESPFIX stack earlier on exception entry
x86/entry/32: Move FIXUP_FRAME after pushing %fs in SAVE_ALL
x86/entry/32: Use %ss segment where required
x86/entry/32: Fix IRET exception
x86/cpu_entry_area: Add guard page for entry stack on 32bit
x86/pti/32: Size initial_page_table correctly
x86/doublefault/32: Fix stack canaries in the double fault handler
x86/xen/32: Simplify ring check in xen_iret_crit_fixup()
x86/xen/32: Make xen_iret_crit_fixup() independent of frame layout
x86/stackframe/32: Repair 32-bit Xen PV
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/doublefault.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/head_32.S | 10 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/doublefault.c b/arch/x86/kernel/doublefault.c index 0b8cedb20d6d..d5c9b13bafdf 100644 --- a/arch/x86/kernel/doublefault.c +++ b/arch/x86/kernel/doublefault.c @@ -65,6 +65,9 @@ struct x86_hw_tss doublefault_tss __cacheline_aligned = { .ss = __KERNEL_DS, .ds = __USER_DS, .fs = __KERNEL_PERCPU, +#ifndef CONFIG_X86_32_LAZY_GS + .gs = __KERNEL_STACK_CANARY, +#endif .__cr3 = __pa_nodebug(swapper_pg_dir), }; diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 30f9cb2c0b55..2e6a0676c1f4 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -571,6 +571,16 @@ ENTRY(initial_page_table) # error "Kernel PMDs should be 1, 2 or 3" # endif .align PAGE_SIZE /* needs to be page-sized too */ + +#ifdef CONFIG_PAGE_TABLE_ISOLATION + /* + * PTI needs another page so sync_initial_pagetable() works correctly + * and does not scribble over the data which is placed behind the + * actual initial_page_table. See clone_pgd_range(). + */ + .fill 1024, 4, 0 +#endif + #endif .data |