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signal/x86: Pass pkey not vma into __bad_area

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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 <tglx@linutronix.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-09-18 00:39:49 +02:00
parent 988bbc7b1a
commit aba1ecd32c
1 changed files with 8 additions and 12 deletions
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20
arch/x86/mm/fault.c
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@ -904,22 +904,16 @@ bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
static void static void
__bad_area(struct pt_regs *regs, unsigned long error_code, __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; 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.. * Something tried to access memory that isn't in our memory map..
* Fix it, but check if it's kernel or user first.. * Fix it, but check if it's kernel or user first..
*/ */
up_read(&mm->mmap_sem); up_read(&mm->mmap_sem);
__bad_area_nosemaphore(regs, error_code, address, __bad_area_nosemaphore(regs, error_code, address, pkey, si_code);
(vma) ? &pkey : NULL, si_code);
} }
static noinline void 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 * But, doing it this way allows compiler optimizations
* if pkeys are compiled out. * if pkeys are compiled out.
*/ */
if (bad_area_access_from_pkeys(error_code, vma)) if (bad_area_access_from_pkeys(error_code, vma)) {
__bad_area(regs, error_code, address, vma, SEGV_PKUERR); u32 pkey = vma_pkey(vma);
else __bad_area(regs, error_code, address, &pkey, SEGV_PKUERR);
__bad_area(regs, error_code, address, vma, SEGV_ACCERR); } else {
__bad_area(regs, error_code, address, NULL, SEGV_ACCERR);
}
} }
static void static void