Messages in this thread | | | From | Andy Lutomirski <> | Subject | [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses | Date | Fri, 27 May 2011 13:38:37 -0400 |
| |
I lied about taking awhile to do this.
There are a bunch of syscall instructions in kernel space at fixed addresses that user code can execute.
One is a time() fallback. Patch 3/5 removes it.
Several are data that isn't marked NX. Patch 2/5 makes vvars NX and 5/5 makes the HPET NX.
The last one is the gettimeofday fallback. We need that, but it doesn't have to be a real syscall. Patch 3/5 adds int 0xCC (callable only from the vsyscall page) that implements the gettimeofday fallback and nothing else.
Patch 1/5 is just a dumb but harmless bug fix from the last vdso series.
I've only tested this in KVM with a hacked-up initramfs, but Ingo wanted it for 2.6.40, so here it is.
Andy Lutomirski (5): x86-64: Fix alignment of jiffies variable x86-64: Give vvars their own page x86-64: Remove kernel.vsyscall64 sysctl x86-64: Replace vsyscall gettimeofday fallback with int 0xcc x86-64: Map the HPET NX
arch/x86/include/asm/fixmap.h | 1 + arch/x86/include/asm/pgtable_types.h | 6 ++- arch/x86/include/asm/traps.h | 4 ++ arch/x86/include/asm/vgtod.h | 1 - arch/x86/include/asm/vsyscall.h | 6 ++ arch/x86/include/asm/vvar.h | 24 ++++----- arch/x86/kernel/entry_64.S | 2 + arch/x86/kernel/hpet.c | 2 +- arch/x86/kernel/traps.c | 4 ++ arch/x86/kernel/vmlinux.lds.S | 27 ++++++---- arch/x86/kernel/vsyscall_64.c | 86 ++++++++++++++++++--------------- arch/x86/vdso/vclock_gettime.c | 55 ++++++++------------- tools/power/x86/turbostat/turbostat | Bin 0 -> 29200 bytes 13 files changed, 117 insertions(+), 101 deletions(-) create mode 100755 tools/power/x86/turbostat/turbostat
-- 1.7.5.1
| |