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Date: Tue, 10 Aug 2021 19:19:32 +0300 From: Jarkko Sakkinen <jarkko@...nel.org> To: Ross Philipson <ross.philipson@...cle.com> Cc: linux-kernel@...r.kernel.org, x86@...nel.org, iommu@...ts.linux-foundation.org, linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org, dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com, luto@...capital.net, kanth.ghatraju@...cle.com, trenchboot-devel@...glegroups.com Subject: Re: [PATCH v3 02/14] x86/boot: Add missing handling of setup_indirect structures On Mon, Aug 09, 2021 at 12:38:44PM -0400, Ross Philipson wrote: > One of the two functions in ioremap.c that handles setup_data was > missing the correct handling of setup_indirect structures. What is "correct handling", and how was it broken? What is 'setup_indirect'? > Functionality missing from original commit: Remove this sentence. > commit b3c72fc9a78e (x86/boot: Introduce setup_indirect) Should be. Fixes: b3c72fc9a78e ("x86/boot: Introduce setup_indirect") > Signed-off-by: Ross Philipson <ross.philipson@...cle.com> > --- > arch/x86/mm/ioremap.c | 21 +++++++++++++++++++-- > 1 file changed, 19 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c > index ab74e4f..f2b34c5 100644 > --- a/arch/x86/mm/ioremap.c > +++ b/arch/x86/mm/ioremap.c > @@ -669,17 +669,34 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr, > > paddr = boot_params.hdr.setup_data; > while (paddr) { > - unsigned int len; > + unsigned int len, size; > > if (phys_addr == paddr) > return true; > > data = early_memremap_decrypted(paddr, sizeof(*data)); > + size = sizeof(*data); > > paddr_next = data->next; > len = data->len; > > - early_memunmap(data, sizeof(*data)); > + if ((phys_addr > paddr) && (phys_addr < (paddr + len))) { > + early_memunmap(data, sizeof(*data)); > + return true; > + } > + > + if (data->type == SETUP_INDIRECT) { > + size += len; > + early_memunmap(data, sizeof(*data)); > + data = early_memremap_decrypted(paddr, size); > + > + if (((struct setup_indirect *)data->data)->type != SETUP_INDIRECT) { > + paddr = ((struct setup_indirect *)data->data)->addr; > + len = ((struct setup_indirect *)data->data)->len; > + } > + } > + > + early_memunmap(data, size); > > if ((phys_addr > paddr) && (phys_addr < (paddr + len))) > return true; > -- > 1.8.3.1 > > /Jarkko
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