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| author | Vasily Gorbik <gor@linux.ibm.com> | 2023-01-28 19:35:12 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-02-06 13:13:53 +0300 |
| commit | 108303b0a2d27cb14eed565e33e64ad9eefe5d7e (patch) | |
| tree | 55d7cbb570842401b580feabc3184408f1b3c276 /arch/s390/mm | |
| parent | dfca37d36b746a066bf4d62bce3276c7639d8f09 (diff) | |
| download | linux-108303b0a2d27cb14eed565e33e64ad9eefe5d7e.tar.xz | |
s390/vmem: fix empty page tables cleanup under KASAN
Commit b9ff81003cf1 ("s390/vmem: cleanup empty page tables") introduced
empty page tables cleanup in vmem code, but when the kernel is built
with KASAN enabled the code has no effect due to wrong KASAN shadow
memory intersection condition, which effectively ignores any memory
range below KASAN shadow. Fix intersection condition to make code
work as anticipated.
Fixes: b9ff81003cf1 ("s390/vmem: cleanup empty page tables")
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 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/vmem.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 15daf777cf41..10bf5fcbb508 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -298,7 +298,7 @@ static void try_free_pmd_table(pud_t *pud, unsigned long start) if (end > VMALLOC_START) return; #ifdef CONFIG_KASAN - if (start < KASAN_SHADOW_END && KASAN_SHADOW_START > end) + if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START) return; #endif pmd = pmd_offset(pud, start); @@ -373,7 +373,7 @@ static void try_free_pud_table(p4d_t *p4d, unsigned long start) if (end > VMALLOC_START) return; #ifdef CONFIG_KASAN - if (start < KASAN_SHADOW_END && KASAN_SHADOW_START > end) + if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START) return; #endif @@ -427,7 +427,7 @@ static void try_free_p4d_table(pgd_t *pgd, unsigned long start) if (end > VMALLOC_START) return; #ifdef CONFIG_KASAN - if (start < KASAN_SHADOW_END && KASAN_SHADOW_START > end) + if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START) return; #endif |