• Andy Lutomirski's avatar
    x86/irq/64: Split the IRQ stack into its own pages · e6401c13
    Andy Lutomirski authored
    Currently, the IRQ stack is hardcoded as the first page of the percpu
    area, and the stack canary lives on the IRQ stack. The former gets in
    the way of adding an IRQ stack guard page, and the latter is a potential
    weakness in the stack canary mechanism.
    
    Split the IRQ stack into its own private percpu pages.
    
    [ tglx: Make 64 and 32 bit share struct irq_stack ]
    Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Brijesh Singh <brijesh.singh@amd.com>
    Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
    Cc: Dominik Brodowski <linux@dominikbrodowski.net>
    Cc: Feng Tang <feng.tang@intel.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jan Beulich <JBeulich@suse.com>
    Cc: Jiri Kosina <jkosina@suse.cz>
    Cc: Joerg Roedel <jroedel@suse.de>
    Cc: Jordan Borgner <mail@jordan-borgner.de>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: Maran Wilson <maran.wilson@oracle.com>
    Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
    Cc: Nick Desaulniers <ndesaulniers@google.com>
    Cc: Nicolai Stange <nstange@suse.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Pu Wen <puwen@hygon.cn>
    Cc: "Rafael Ávila de Espíndola" <rafael@espindo.la>
    Cc: Sean Christopherson <sean.j.christopherson@intel.com>
    Cc: Stefano Stabellini <sstabellini@kernel.org>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: x86-ml <x86@kernel.org>
    Cc: xen-devel@lists.xenproject.org
    Link: https://lkml.kernel.org/r/20190414160146.267376656@linutronix.de
    e6401c13
setup_percpu.c 8.37 KB