[PATCH AUTOSEL 4.14 46/66] x86/pci: Fix the function type for check_reserved_t

From: Sasha Levin
Date: Tue Dec 22 2020 - 21:25:03 EST


From: Sami Tolvanen <samitolvanen@xxxxxxxxxx>

[ Upstream commit 83321c335dccba262a57378361d63da96b8166d6 ]

e820__mapped_all() is passed as a callback to is_mmconf_reserved(),
which expects a function of type:

typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned type);

However, e820__mapped_all() accepts enum e820_type as the last argument
and this type mismatch trips indirect call checking with Clang's
Control-Flow Integrity (CFI).

As is_mmconf_reserved() only passes enum e820_type values for the
type argument, change the typedef and the unused type argument in
is_acpi_reserved() to enum e820_type to fix the type mismatch.

Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
Suggested-by: Borislav Petkov <bp@xxxxxxxxx>
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20201130193900.456726-1-samitolvanen@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/x86/pci/mmconfig-shared.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 96684d0adcf94..ec63c1e622d77 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -424,7 +424,7 @@ static acpi_status find_mboard_resource(acpi_handle handle, u32 lvl,
return AE_OK;
}

-static bool is_acpi_reserved(u64 start, u64 end, unsigned not_used)
+static bool is_acpi_reserved(u64 start, u64 end, enum e820_type not_used)
{
struct resource mcfg_res;

@@ -441,7 +441,7 @@ static bool is_acpi_reserved(u64 start, u64 end, unsigned not_used)
return mcfg_res.flags;
}

-typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned type);
+typedef bool (*check_reserved_t)(u64 start, u64 end, enum e820_type type);

static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
struct pci_mmcfg_region *cfg,
--
2.27.0