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| author | Vasily Gorbik <gor@linux.ibm.com> | 2023-01-23 14:49:47 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-02-06 13:13:54 +0300 |
| commit | 22476f47b6b7fb7d066c71f67ebc11892adb0849 (patch) | |
| tree | e2a9ef86f38f3501764f5f8aed29d20fd40e29c4 /mm/mmzone.c | |
| parent | eb33f9eb304a4c18beb5ba6362eaa5c4beaf40d8 (diff) | |
| download | linux-22476f47b6b7fb7d066c71f67ebc11892adb0849.tar.xz | |
s390/boot: fix mem_detect extended area allocation
Allocation of mem_detect extended area was not considered neither
in commit 9641b8cc733f ("s390/ipl: read IPL report at early boot")
nor in commit b2d24b97b2a9 ("s390/kernel: add support for kernel address
space layout randomization (KASLR)"). As a result mem_detect extended
theoretically may overlap with ipl report or randomized kernel image
position. But as mem_detect code will allocate extended area only
upon exceeding 255 online regions (which should alternate with offline
memory regions) it is not seen in practice.
To make sure mem_detect extended area does not overlap with ipl report
or randomized kernel position extend usage of "safe_addr". Make initrd
handling and mem_detect extended area allocation code move it further
right and make KASLR takes in into consideration as well.
Fixes: 9641b8cc733f ("s390/ipl: read IPL report at early boot")
Fixes: b2d24b97b2a9 ("s390/kernel: add support for kernel address space layout randomization (KASLR)")
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'mm/mmzone.c')
0 files changed, 0 insertions, 0 deletions