Commit-ID: 018edcfac4c3b140366ad51b0907f3becb5bb624
Gitweb: http://git.kernel.org/tip/018edcfac4c3b140366ad51b0907f3becb5bb624
Author: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
AuthorDate: Thu, 24 Nov 2016 18:02:23 +0000
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Fri, 25 Nov 2016 07:15:23 +0100
efi/libstub: Make efi_random_alloc() allocate below 4 GB on 32-bit
The UEFI stub executes in the context of the firmware, which identity
maps the available system RAM, which implies that only memory below
4 GB can be used for allocations on 32-bit architectures, even on [L]PAE
capable hardware.
So ignore any reported memory above 4 GB in efi_random_alloc(). This
also fixes a reported build problem on ARM under -Os, where the 64-bit
logical shift relies on a software routine that the ARM decompressor does
not provide.
A second [minor] issue is also fixed, where the '+ 1' is moved out of
the shift, where it belongs: the reason for its presence is that a
memory region where start == end should count as a single slot, given
that 'end' takes the desired size and alignment of the allocation into
account.
To clarify the code in this regard, rename start/end to 'first_slot' and
'last_slot', respectively, and introduce 'region_end' to describe the
last usable address of the current region.
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-efi@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1480010543-25709-2-git-send-email-ard.biesheuvel@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/firmware/efi/libstub/random.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c
index 3a3feac..7e72954 100644
--- a/drivers/firmware/efi/libstub/random.c
+++ b/drivers/firmware/efi/libstub/random.c
@@ -45,19 +45,20 @@ static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
unsigned long align_shift)
{
unsigned long align = 1UL << align_shift;
- u64 start, end;
+ u64 first_slot, last_slot, region_end;
if (md->type != EFI_CONVENTIONAL_MEMORY)
return 0;
- start = round_up(md->phys_addr, align);
- end = round_down(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - size,
- align);
+ region_end = min((u64)ULONG_MAX, md->phys_addr + md->num_pages*EFI_PAGE_SIZE - 1);
- if (start > end)
+ first_slot = round_up(md->phys_addr, align);
+ last_slot = round_down(region_end - size + 1, align);
+
+ if (first_slot > last_slot)
return 0;
- return (end - start + 1) >> align_shift;
+ return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1;
}
/*
--
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