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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2010-01-21 14:19:07 +0300 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-25 17:26:39 +0300 |
| commit | 062d5e9b0d714f449b261bb522eadaaf6f00f438 (patch) | |
| tree | cd0e9b7e7449a2b067614865998218fd4462e581 /arch/s390/kvm | |
| parent | b6a114d27273c37cd0107b0f49af208168498f05 (diff) | |
| download | linux-062d5e9b0d714f449b261bb522eadaaf6f00f438.tar.xz | |
KVM: S390: fix potential array overrun in intercept handling
kvm_handle_sie_intercept uses a jump table to get the intercept handler
for a SIE intercept. Static code analysis revealed a potential problem:
the intercept_funcs jump table was defined to contain (0x48 >> 2) entries,
but we only checked for code > 0x48 which would cause an off-by-one
array overflow if code == 0x48.
Use the compiler and ARRAY_SIZE to automatically set the limits.
Cc: stable@kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/intercept.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index ba9d8a7bc1ac..b40096494e46 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -213,7 +213,7 @@ static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) return rc2; } -static const intercept_handler_t intercept_funcs[0x48 >> 2] = { +static const intercept_handler_t intercept_funcs[] = { [0x00 >> 2] = handle_noop, [0x04 >> 2] = handle_instruction, [0x08 >> 2] = handle_prog, @@ -230,7 +230,7 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu) intercept_handler_t func; u8 code = vcpu->arch.sie_block->icptcode; - if (code & 3 || code > 0x48) + if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs)) return -ENOTSUPP; func = intercept_funcs[code >> 2]; if (func) |