[PATCH] The nested NMI modifies the place (instruction, flags and stack)

f the preserved copy of the iret registers ("saved") and the copy subject to being trampled by nested NMI ("copied"). Signed-off-by: Salman Qazi --- arch/x86/kernel/entry_64.S | 41 +++-- 1 files changed, 27 insertions(+), 14 deletions(

[PATCH] [PATCH] x86: Don't clobber top of pt_regs in nested NMI

rrect output. We solve this problem by interchanging the position of the preserved copy of the iret registers ("saved") and the copy subject to being trampled by nested NMI ("copied"). Signed-off-by: Salman Qazi --- arch/x86/kernel/entry_64.S | 41 +

[PATCH] crypto: Make VMAC work when blocks aren't aligned

size. I also added test cases for unaligned blocks. Signed-off-by: Salman Qazi --- crypto/testmgr.h | 33 - crypto/vmac.c | 47 +++ include/crypto/vmac.h |2 ++ 3 files changed, 77 insertions(+), 5

Re: [PATCH] x86: Don't clobber top of pt_regs in nested NMI

On Mon, Sep 24, 2012 at 6:27 AM, Steven Rostedt wrote: > On Tue, Sep 18, 2012 at 06:29:35PM -0700, Salman Qazi wrote: >> The nested NMI modifies the place (instruction, flags and stack) >> that the first NMI will iret to. However, the copy of registers >> modified is exactl

[PATCH] x86: Don't clobber top of pt_regs in nested NMI

arded. Signed-off-by: Salman Qazi --- arch/x86/kernel/entry_64.S | 20 +++- 1 files changed, 19 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 69babd8..40ddb6d 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/ent

Re: [BUG] mm: direct I/O (using GUP) can write to COW anonymous pages

On Mon, Sep 17, 2018 at 5:05 PM Hugh Dickins wrote: > > Hi Jann, > > On Mon, 17 Sep 2018, Jann Horn wrote: > > > [I'm not sure who the best people to ask about this are, I hope the > > recipient list resembles something reasonable...] > > > > I have noticed that the dup_mmap() logic on fork() does

icache_is_aliasing and big.LITTLE

Hi, What is the intention behind icache_is_aliasing on big.LITTLE systems where some icaches are VIPT and others are PIPT? Is it meant to be conservative in some sense or should it be made per-CPU? Thanks for your help, Salman

Re: icache_is_aliasing and big.LITTLE

Thank you. On Thu, May 9, 2019 at 1:50 AM Catalin Marinas wrote: > > Hi, > > On Wed, May 08, 2019 at 11:45:03AM -0700, Salman Qazi wrote: > > What is the intention behind icache_is_aliasing on big.LITTLE systems > > where some icaches are VIPT and others are

Re: [PATCH] fs, ipc: Use an asynchronous version of kern_unmount in IPC

Do you have any additional concerns? On Thu, Feb 7, 2019 at 10:43 AM Salman Qazi wrote: > > On Wed, Feb 6, 2019 at 8:14 PM Al Viro wrote: > > > > On Wed, Feb 06, 2019 at 11:53:54AM -0800, Salman Qazi wrote: > > > > > This patch solves the issue by removin

[PATCH RESENT] fs, ipc: Use an asynchronous version of kern_unmount in IPC

n 0; } assert(waitpid(pid, &status, 0) == pid); } } Before: $ time ./unshare2 real0m9.784s user0m0.428s sys 0m0.000s After: $ time ./unshare2 real0m0.368s user0m0.226s sys 0m0.122s Signed-off-by: Salman Qazi Revi

[tip:x86/asm] x86: Don't clobber top of pt_regs in nested NMI

Commit-ID: 28696f434fef0efa97534b59986ad33b9c4df7f8 Gitweb: http://git.kernel.org/tip/28696f434fef0efa97534b59986ad33b9c4df7f8 Author: Salman Qazi AuthorDate: Mon, 1 Oct 2012 17:29:25 -0700 Committer: Steven Rostedt CommitDate: Fri, 2 Nov 2012 11:29:36 -0400 x86: Don't clobber t