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cxl: Fix off by one error allowing subsequent mmap page to be accessed

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It was discovered that if a process mmaped their problem state area they
were able to access one page more than expected, potentially allowing
them to access the problem state area of an unrelated process.

This was due to a simple off by one error in the mmap fault handler
introduced in 0712dc7e73 ("cxl: Fix issues
when unmapping contexts"), which is fixed in this patch.

Cc: stable@vger.kernel.org
Fixes: 0712dc7e73 ("cxl: Fix issues when unmapping contexts")
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ian Munsie 2015-07-07 15:45:45 +10:00 committed by Michael Ellerman
parent 5caaf53468
commit 10a5894f2d
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/cxl/context.c
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@ -113,11 +113,11 @@ static int cxl_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
if (ctx->afu->current_mode == CXL_MODE_DEDICATED) {
area = ctx->afu->psn_phys;
if (offset > ctx->afu->adapter->ps_size)
if (offset >= ctx->afu->adapter->ps_size)
return VM_FAULT_SIGBUS;
} else {
area = ctx->psn_phys;
if (offset > ctx->psn_size)
if (offset >= ctx->psn_size)
return VM_FAULT_SIGBUS;
}