The patch titled
Subject: mm/page_alloc.c: fix early params garbage value accesses
has been added to the -mm tree. Its filename is
mm-page_allocc-fix-early-params-garbage-value-accesses.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_allocc-fix-early-params-garbage-value-accesses.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_allocc-fix-early-params-garbage-value-accesses.patch
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------------------------------------------------------
From: Mateusz Nosek <mateusznosek0@xxxxxxxxx>
Subject: mm/page_alloc.c: fix early params garbage value accesses
Previously in '__init early_init_on_alloc' and '__init early_init_on_free'
the return values from 'kstrtobool' were not handled properly. That
caused potential garbage value read from variable 'bool_result'.
Introduced patch fixes error handling.
Link: https://lkml.kernel.org/r/20200916214125.28271-1-mateusznosek0@xxxxxxxxx
Signed-off-by: Mateusz Nosek <mateusznosek0@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/mm/page_alloc.c~mm-page_allocc-fix-early-params-garbage-value-accesses
+++ a/mm/page_alloc.c
@@ -155,16 +155,16 @@ static int __init early_init_on_alloc(ch
int ret;
bool bool_result;
- if (!buf)
- return -EINVAL;
ret = kstrtobool(buf, &bool_result);
+ if (ret)
+ return ret;
if (bool_result && page_poisoning_enabled())
pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take precedence over init_on_alloc\n");
if (bool_result)
static_branch_enable(&init_on_alloc);
else
static_branch_disable(&init_on_alloc);
- return ret;
+ return 0;
}
early_param("init_on_alloc", early_init_on_alloc);
@@ -173,16 +173,16 @@ static int __init early_init_on_free(cha
int ret;
bool bool_result;
- if (!buf)
- return -EINVAL;
ret = kstrtobool(buf, &bool_result);
+ if (ret)
+ return ret;
if (bool_result && page_poisoning_enabled())
pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take precedence over init_on_free\n");
if (bool_result)
static_branch_enable(&init_on_free);
else
static_branch_disable(&init_on_free);
- return ret;
+ return 0;
}
early_param("init_on_free", early_init_on_free);
_
Patches currently in -mm which might be from mateusznosek0@xxxxxxxxx are
mm-slabc-clean-code-by-removing-redundant-if-condition.patch
mm-page_allocc-clean-code-by-removing-unnecessary-initialization.patch
mm-page_allocc-micro-optimization-remove-unnecessary-branch.patch
mm-page_allocc-fix-early-params-garbage-value-accesses.patch
mm-compactionc-micro-optimization-remove-unnecessary-branch.patch
