From: Eric W. Biederman Date: Mon, 17 Sep 2018 22:39:49 +0000 (+0200) Subject: signal/x86: Pass pkey not vma into __bad_area X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=aba1ecd32c756e5d3c220aae9928d18c43d78cd0;p=openwrt%2Fstaging%2Fblogic.git signal/x86: Pass pkey not vma into __bad_area There is only one caller of __bad_area that passes in PKUERR and thus will generate a siginfo with si_pkey set. Therefore simplify the logic and hoist reading of vma_pkey up into that caller, and just pass *pkey into __bad_area. Reviewed-by: Thomas Gleixner Signed-off-by: "Eric W. Biederman" --- diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index b3d8aee7564c..35e7ab3a6a4f 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -904,22 +904,16 @@ bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code, static void __bad_area(struct pt_regs *regs, unsigned long error_code, - unsigned long address, struct vm_area_struct *vma, int si_code) + unsigned long address, u32 *pkey, int si_code) { struct mm_struct *mm = current->mm; - u32 pkey; - - if (vma) - pkey = vma_pkey(vma); - /* * Something tried to access memory that isn't in our memory map.. * Fix it, but check if it's kernel or user first.. */ up_read(&mm->mmap_sem); - __bad_area_nosemaphore(regs, error_code, address, - (vma) ? &pkey : NULL, si_code); + __bad_area_nosemaphore(regs, error_code, address, pkey, si_code); } static noinline void @@ -954,10 +948,12 @@ bad_area_access_error(struct pt_regs *regs, unsigned long error_code, * But, doing it this way allows compiler optimizations * if pkeys are compiled out. */ - if (bad_area_access_from_pkeys(error_code, vma)) - __bad_area(regs, error_code, address, vma, SEGV_PKUERR); - else - __bad_area(regs, error_code, address, vma, SEGV_ACCERR); + if (bad_area_access_from_pkeys(error_code, vma)) { + u32 pkey = vma_pkey(vma); + __bad_area(regs, error_code, address, &pkey, SEGV_PKUERR); + } else { + __bad_area(regs, error_code, address, NULL, SEGV_ACCERR); + } } static void