Public bug reported:
[Impact]
init_on_alloc and init_on_free kernel parameters cannot be used on ppc64el.
[Test case]
Boot the system with and without init_on_alloc and init_on_free kernel
parameters, both with 0 and 1 as values.
[Fix]
Upstream commit 04013513cc84c401c7de9023ff3eda7863fc4add ("mm, page_alloc: do
not rely on the order of page_poison and init_on_alloc/free parameters") defers
setting the static branches to mm_init, which is after jump_label_init has been
called, while on ppc64el, parse_early_param is called before that, leading to
the crash very early at boot.
[Potential regression]
Boot can be broken, or init_on_alloc/init_on_free may not be properly
functioning during early boot or even after that, allowing kernel data leak to
happen in the presence of bugs.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: Confirmed
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Groovy)
Status: New => Confirmed
** Changed in: linux (Ubuntu Groovy)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1922593
Title:
using init_on_alloc or init_on_free kernel parameters on ppc64el
prevent boot
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux source package in Groovy:
Confirmed
Bug description:
[Impact]
init_on_alloc and init_on_free kernel parameters cannot be used on ppc64el.
[Test case]
Boot the system with and without init_on_alloc and init_on_free kernel
parameters, both with 0 and 1 as values.
[Fix]
Upstream commit 04013513cc84c401c7de9023ff3eda7863fc4add ("mm, page_alloc: do
not rely on the order of page_poison and init_on_alloc/free parameters") defers
setting the static branches to mm_init, which is after jump_label_init has been
called, while on ppc64el, parse_early_param is called before that, leading to
the crash very early at boot.
[Potential regression]
Boot can be broken, or init_on_alloc/init_on_free may not be properly
functioning during early boot or even after that, allowing kernel data leak to
happen in the presence of bugs.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1922593/+subscriptions
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