linux-toradex.git/arch/x86_64/kernel/entry.S, branch v2.6.17.3

[PATCH] x86_64: Don't do syscall exit tracing twice

2006-05-31T03:31:06+00:00

int_ret_from_syscall already does syscall exit tracing, so
no need to do it again in the caller.

This caused problems for UML and some other special programs doing
syscall interception.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: When user could have changed RIP always force IRET

2006-04-09T18:53:52+00:00

Intel EM64T CPUs handle uncanonical return addresses differently
from AMD CPUs.

The exception is reported in the SYSRET, not the next instruction.
This leads to the kernel exception handler running on the user stack
with the wrong GS because the kernel didn't expect exceptions
on this instruction.

This version of the patch has the teething problems that plagued an earlier
version fixed.

This is CVE-2006-0744

Thanks to Ernie Petrides and Asit B. Mallick for analysis and initial
patches.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: Clean up execve path

2006-04-09T18:53:16+00:00

Just call IRET always, no need for any special cases.

Needed for the next bug fix.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: Report SIGSEGV for IRET faults

2006-03-25T17:14:39+00:00

tcsh is not happy with the -9999 error code.

Suggested by Ernie Petrides

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

Revert "[PATCH] x86-64: Fix up handling of non canonical user RIPs"

2006-03-14T16:01:47+00:00

This reverts commit c33d4568aca9028a22857f94f5e0850012b6444b.

Andrew Clayton and Hugh Dickins report that it's broken for them and
causes strange page table and slab corruption, and spontaneous reboots.

Let's get it right next time.

Cc: Andrew Clayton 
Cc: Hugh Dickins 
Cc: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86-64: Fix up handling of non canonical user RIPs

2006-03-13T06:56:29+00:00

EM64T CPUs have somewhat weird error reporting for non canonical RIPs in
SYSRET.

We can't handle any exceptions there because the exception handler would
end up running on the user stack which is unsafe.

To avoid problems any code that might end up with a user touched pt_regs
should return using int_ret_from_syscall.  int_ret_from_syscall ends up
using IRET, which allows safe exceptions.

Cc: Ernie Petrides 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: Don't call do_exit with interrupts disabled after IRET exception

2006-02-17T16:00:40+00:00

This caused a sigreturn with bad argument on a preemptible kernel
to complain with

Debug: sleeping function called from invalid context at /home/lsrc/quilt/linux/include/linux/rwsem.h:43
in_atomic():0, irqs_disabled():1

Call Trace: {__might_sleep+190} {profile_task_exit+21}
       {__do_exit+34} {do_wait+0}

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: small fix for CFI annotations

2006-02-05T00:43:15+00:00

Conditionalize two unwind directives to match other similarly
conditional code.

Signed-Off-By: Jan Beulich 
Cc: Jim Houston 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: Disallow kprobes on NMI handlers

2006-02-05T00:43:12+00:00

A kprobe executes IRET early and that could cause NMI recursion
and stack corruption.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds

[PATCH] x86_64: Allow nesting of int3 by default for kprobes

2006-01-16T19:27:58+00:00

This unbreaks recursive kprobes which didn't work anymore
due to an earlier patch which converted the debug entry point
to use an IST.

This also allows nesting of the debug entry point too.

Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds