Roland McGrath 6ea65ff79c [PATCH] i386: clear segment register padding in core dumps ... The segment register slots in struct pt_regs are padded to 32 bits. Some of these are stored with instructions like "pushl %es", which leaves the high 16 bits as they were. So the high bits of these fields in struct pt_regs contain kernel stack garbage. These bits are ignored by everything and never leak to user space, except in core dumps. The user struct pt_regs is always at the base of the thread's kernel stack and so it seems unlikely the information that leaks from here is ever worthwhile so as to be a security concern, but I'm not sure about that. It has been this way for ages; userland consumers of core dumps all mask off these high bits themselves. So it is not urgent. This change masks off the padding bits of the segment register slots in core dumps. ptrace already masks off these high bits, so this makes the values in core dumps consistent with what ptrace would report just before the process died. As I read the processor manuals, the cs and ss values will always be padded with zero bits rather than stack garbage. But unlike "pushl %es", this is not simple to test with a userland program. So I added the two instructions rather than wonder if they are really never necessary. I think that x86_64 does not have this problem (for either 32-bit or 64-bit processes). It only uses "mov" instructions from segment registers, which zero-extend. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-03-23 15:32:58 -07:00
..
mach-bigsmp
mach-default	[PATCH] clockevents: i386 drivers	2007-02-16 08:13:59 -08:00
mach-es7000	ACPICA: Remove duplicate table definitions (non-conflicting), cont	2007-02-02 21:14:29 -05:00
mach-generic
mach-numaq
mach-summit	[PATCH] i386: Fix compilation with UP genericarch	2006-11-28 20:12:59 +01:00
mach-visws	[PATCH] visws build fix	2006-10-28 11:30:52 -07:00
mach-voyager	[PATCH] clockevents: i386 drivers	2007-02-16 08:13:59 -08:00
8253pit.h
a.out.h
acpi.h	ACPI: cleanup: make disable_acpi() valid w/o CONFIG_ACPI	2007-02-13 00:09:13 -05:00
agp.h
alternative-asm.i
alternative.h	[PATCH] paravirt: Patch inline replacements for paravirt intercepts	2006-12-07 02:14:08 +01:00
apic.h	[PATCH] i386: add command line option "local_apic_timer_c2_ok"	2007-03-23 10:21:02 -07:00
apicdef.h
arch_hooks.h
atomic.h	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
auxvec.h
bitops.h	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
boot.h	[PATCH] i386: Restore CONFIG_PHYSICAL_START option	2007-01-05 23:55:23 -08:00
bug.h	[PATCH] Generic BUG for i386	2006-12-08 08:28:39 -08:00
bugs.h	[PATCH] i386: improve sched_clock() on i686	2007-02-13 13:26:22 +01:00
byteorder.h
cache.h
cacheflush.h	[PATCH] Optimize D-cache alias handling on fork	2006-12-13 09:27:08 -08:00
checksum.h	[NET]: I386 checksum annotations and cleanups.	2006-12-02 21:23:19 -08:00
cpu.h	[PATCH] i386: introduce the mechanism of disabling cpu hotplug control	2006-12-07 02:14:10 +01:00
cpufeature.h	[PATCH] i386: i386 add Intel BTS cpufeature bit and detection (take 2)	2006-12-07 02:14:11 +01:00
cputime.h
current.h	[PATCH] i386: Implement "current" with the PDA	2006-12-07 02:14:03 +01:00
debugreg.h
delay.h	[PATCH] vmi: paravirt drop udelay op	2007-03-05 07:57:52 -08:00
desc.h	[PATCH] i386: Rename cpu_gdt_descr and remove extern declaration from smpboot.c	2007-02-13 13:26:26 +01:00
device.h	ACPI: Change ACPI to use dev_archdata instead of firmware_data	2006-12-01 14:52:01 -08:00
div64.h
dma-mapping.h	[PATCH] Pass struct dev pointer to dma_cache_sync()	2006-12-07 08:39:41 -08:00
dma.h
dmi.h
dwarf2.h
e820.h	[PATCH] compile error of register_memory()	2006-12-22 08:55:49 -08:00
edac.h
elf.h	[PATCH] i386: clear segment register padding in core dumps	2007-03-23 15:32:58 -07:00
emergency-restart.h
errno.h
fcntl.h
fixmap.h	[PATCH] Fix CONFIG_COMPAT_VDSO	2007-01-26 13:50:58 -08:00
floppy.h
frame.i
futex.h	[PATCH] mm: pagefault_{disable,enable}()	2006-12-07 08:39:21 -08:00
genapic.h	[PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525	2006-12-07 02:14:10 +01:00
hardirq.h
highmem.h
hpet.h	[PATCH] clockevents: i386 drivers	2007-02-16 08:13:59 -08:00
hw_irq.h	[PATCH] i386/x86_64: Remove global IO_APIC_VECTOR	2006-10-08 12:24:02 -07:00
hypertransport.h
i387.h	[PATCH] i386: add sleazy FPU optimization	2006-12-07 02:14:01 +01:00
i8253.h	[PATCH] clockevents: i386 drivers	2007-02-16 08:13:59 -08:00
i8259.h
ide.h	[PATCH] ide: more conversion to pci_get APIs	2006-12-08 08:29:03 -08:00
intel_arch_perfmon.h
io_apic.h	[PATCH] io_apic.h needs apicdef.h	2007-03-05 07:57:50 -08:00
io.h	[PATCH] kill eth_io_copy_and_sum()	2007-02-09 09:14:07 -08:00
ioctl.h
ioctls.h
ipc.h
ipcbuf.h
irq_regs.h	[PATCH] i386: Store the interrupt regs pointer in the PDA	2006-12-07 02:14:03 +01:00
irq.h	[PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525	2006-12-07 02:14:10 +01:00
irqflags.h	[PATCH] paravirt: Patch inline replacements for paravirt intercepts	2006-12-07 02:14:08 +01:00
ist.h
k8.h
Kbuild	[PATCH] cleanup asm/setup.h userspace visibility	2006-12-07 08:39:46 -08:00
kdebug.h
kexec.h
kmap_types.h
kprobes.h
ldt.h
linkage.h
local.h
math_emu.h	[PATCH] i386: PDA: Fix math emulator for new pt_regs	2006-12-07 02:14:03 +01:00
mc146818rtc.h
mca_dma.h
mca.h
mce.h	[PATCH] i386: Move mce_disabled to asm/mce.h	2007-02-13 13:26:26 +01:00
mman.h
mmu_context.h	[PATCH] i386: Convert i386 PDA code to use %fs	2007-02-13 13:26:20 +01:00
mmu.h
mmx.h
mmzone.h	[PATCH] silence unused pgdat warning from alloc_bootmem_node and friends	2006-12-07 08:39:23 -08:00
module.h	[PATCH] i386: always enable regparm	2006-12-07 02:14:12 +01:00
mpspec_def.h	[PATCH] x86-64: remove remaining pc98 code	2006-12-07 02:14:19 +01:00
mpspec.h	[PATCH] clockevents: i386 drivers	2007-02-16 08:13:59 -08:00
msgbuf.h
msidef.h
msr.h	Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq	2007-02-26 14:17:50 -08:00
mtrr.h
mutex.h
namei.h
nmi.h	Disable NMI watchdog by default properly	2007-03-14 17:53:43 -07:00
numa.h
numaq.h
page.h	[PATCH] Fix CONFIG_COMPAT_VDSO	2007-01-26 13:50:58 -08:00
param.h	[PATCH] cleanup asm/setup.h userspace visibility	2006-12-07 08:39:46 -08:00
paravirt.h	[PATCH] fastcall still doesn't make sense in paravirt	2007-03-14 15:27:49 -07:00
parport.h
pci-direct.h
pci.h
pda.h	[PATCH] i386: Convert i386 PDA code to use %fs	2007-02-13 13:26:20 +01:00
percpu.h	[PATCH] i386: espfix cleanup	2006-12-07 02:14:01 +01:00
pgalloc.h	[PATCH] MM: page allocation hooks for VMI backend	2007-02-13 13:26:21 +01:00
pgtable-2level-defs.h
pgtable-2level.h	[PATCH] paravirt: fix missing pte update	2006-12-07 02:14:09 +01:00
pgtable-3level-defs.h
pgtable-3level.h	[PATCH] paravirt: fix missing pte update	2006-12-07 02:14:09 +01:00
pgtable.h	[PATCH] vmi: fix highpte	2007-03-05 07:57:52 -08:00
poll.h
posix_types.h
processor.h	Revert "[PATCH] i386: add idle notifier"	2007-02-26 09:21:46 -08:00
ptrace-abi.h
ptrace.h	[PATCH] i386: Profile pc badness	2007-02-13 13:26:21 +01:00
resource.h
rtc.h
rwlock.h
rwsem.h	[PATCH] lockdep: name some old style locks	2006-12-07 08:39:36 -08:00
scatterlist.h
seccomp.h
sections.h
segment.h	[PATCH] i386: Profile pc badness	2007-02-13 13:26:21 +01:00
semaphore.h
sembuf.h
serial.h
setup.h	[PATCH] i386: Remove extern declaration from mm/discontig.c, put in header.	2007-02-13 13:26:26 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
smp.h	[PATCH] i386: SMP boot hook for paravirt	2007-02-13 13:26:21 +01:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h	[PATCH] Remove 'volatile' from spinlock_types	2006-12-06 14:39:53 -08:00
spinlock.h	[PATCH] paravirt: Patch inline replacements for paravirt intercepts	2006-12-07 02:14:08 +01:00
srat.h
stacktrace.h
stat.h
statfs.h
string.h
suspend.h	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	2006-12-07 08:59:11 -08:00
sync_bitops.h	[PATCH] i386: fix typo in sync_constant_test_bit()'s name	2007-03-16 19:25:07 -07:00
system.h	[PATCH] paravirt: header and stubs for paravirtualisation	2006-12-07 02:14:07 +01:00
termbits.h	[PATCH] tty: preparatory structures for termios revamp	2006-12-08 08:28:56 -08:00
termios.h	[PATCH] consolidate line discipline number definitions	2007-02-11 10:51:26 -08:00
therm_throt.h
thread_info.h	[PATCH] PM: Fix SMP races in the freezer	2006-12-13 09:05:49 -08:00
time.h	[PATCH] vmi: pit override	2007-03-05 07:57:52 -08:00
timer.h	[PATCH] vmi: cpu cycles fix	2007-03-05 07:57:52 -08:00
timex.h
tlb.h
tlbflush.h	[PATCH] paravirt: Add MMU virtualization to paravirt_ops	2006-12-07 02:14:08 +01:00
topology.h	[PATCH] sched: remove SMT nice	2007-03-05 07:57:51 -08:00
tsc.h	[PATCH] i386: make x86_64 tsc header require i386 rather than vice-versa	2007-03-06 09:30:24 -08:00
types.h	[PATCH] Centralise definitions of sector_t and blkcnt_t	2006-12-04 19:41:15 -08:00
uaccess.h	[PATCH] fix sparse warnings from {asm,net}/checksum.h	2007-02-11 10:51:31 -08:00
ucontext.h
unaligned.h
unistd.h	[PATCH] remove kernel syscalls	2006-12-07 08:39:37 -08:00
unwind.h	Remove stack unwinder for now	2006-12-15 08:47:51 -08:00
user.h
vga.h
vic.h	[VOYAGER] fix up ptregs removal mess	2006-10-12 22:25:03 -05:00
vm86.h	[PATCH] i386: Update sys_vm86 to cope with changed pt_regs and %gs usage	2006-12-07 02:14:03 +01:00
vmi_time.h	[PATCH] Fix vmi time header bug	2007-03-12 16:36:16 -07:00
vmi.h	[PATCH] vmi: apic ops	2007-03-05 07:57:52 -08:00
voyager.h	[VOYAGER] fix up attribute packed specifiers in voyager.h	2006-10-12 22:23:18 -05:00
xor.h