hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9S5SX CVE: NA

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commit 50afa8757dea("mm: prepare to support weighted interleaving mempolicy") kabi reservation for structures task_struct, vm_operations_struct, for support of weighted L/R-based memory interleaving Allocation, the above patch failed to add MPOL_WEIGHTED_INTERLEAVE to the policy_modes array, resulting in out-of-bounds accesses when accessing the policy_modes array in mpol_parse_str.

Fixes: 50afa8757dea ("mm: prepare to support weighted interleaving mempolicy") Signed-off-by: Ze Zuo zuoze1@huawei.com --- mm/mempolicy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 17aadb5ca5f7..f4860a9e8d0b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1477,7 +1477,8 @@ static inline int sanitize_mpol_flags(int *mode, unsigned short *flags) *flags = *mode & MPOL_MODE_FLAGS; *mode &= ~MPOL_MODE_FLAGS;

- if ((unsigned int)(*mode) >= MPOL_MAX) + if ((unsigned int)(*mode) >= MPOL_MAX || + (unsigned int)(*mode) == MPOL_WEIGHTED_INTERLEAVE) return -EINVAL; if ((*flags & MPOL_F_STATIC_NODES) && (*flags & MPOL_F_RELATIVE_NODES)) return -EINVAL; @@ -2989,6 +2990,7 @@ static const char * const policy_modes[] = [MPOL_PREFERRED] = "prefer", [MPOL_BIND] = "bind", [MPOL_INTERLEAVE] = "interleave", + [MPOL_WEIGHTED_INTERLEAVE] = "weighted interleave", [MPOL_LOCAL] = "local", [MPOL_PREFERRED_MANY] = "prefer (many)", };