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lib/relocator: Always enforce the requested alignment in malloc_in_range()

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On failure to allocate from grub_relocator_firmware_alloc_region() in
malloc_in_range() the function would stop enforcing the alignment, and
the following was returned:

  lib/relocator.c:431: trying to allocate in 0x200000-0xffbf9fff aligned 0x200000 size 0x406000
  lib/relocator.c:1197: allocated: 0x74de2000+0x406000
  lib/relocator.c:1407: allocated 0x74de2000/0x74de2000

Fix this by making sure that target always contains a suitably aligned
address. After the change the return from the function is:

  lib/relocator.c:431: trying to allocate in 0x200000-0xffb87fff aligned 0x200000 size 0x478000
  lib/relocator.c:1204: allocated: 0x74c00000+0x478000
  lib/relocator.c:1414: allocated 0x74c00000/0x74c00000

Fixes: 3a5768645c (First version of allocation from firmware)

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Roger Pau Monné
2023-05-12 09:33:55 +02:00
committed by Daniel Kiper
parent 260a9eab46
commit 4127ea3a9a
1 changed files with 2 additions and 2 deletions
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4
grub-core/lib/relocator.c
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@@ -744,7 +744,7 @@ malloc_in_range (struct grub_relocator *rel,
{
target = starta;
if (target < start)
target = start;
target = ALIGN_UP (start, align);
if (target + size <= end && target + size <= events[j].pos)
/* Found an usable address. */
goto found;
@@ -761,7 +761,7 @@ malloc_in_range (struct grub_relocator *rel,
{
target = starta - size;
if (target > end - size)
target = end - size;
target = ALIGN_DOWN (end - size, align);
if (target >= start && target >= events[j].pos)
goto found;
}