5.4-stable review patch. If anyone has any objections, please let me know.
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From: Naveen N Rao naveen@kernel.org
[ Upstream commit 8f9abaa6d7de0a70fc68acaedce290c1f96e2e59 ]
Some of the fp/vmx code in sstep.c assume a certain maximum size for the instructions being emulated. The size of those operations however is determined separately in analyse_instr().
Add a check to validate the assumption on the maximum size of the operations, so as to prevent any unintended kernel stack corruption.
Signed-off-by: Naveen N Rao naveen@kernel.org Reviewed-by: Gustavo A. R. Silva gustavoars@kernel.org Build-tested-by: Gustavo A. R. Silva gustavoars@kernel.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/20231123071705.397625-1-naveen@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/lib/sstep.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 27650cd5857f..490162fb0893 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -469,6 +469,8 @@ static int do_fp_load(struct instruction_op *op, unsigned long ea, } u;
nb = GETSIZE(op->type); + if (nb > sizeof(u)) + return -EINVAL; if (!address_ok(regs, ea, nb)) return -EFAULT; rn = op->reg; @@ -519,6 +521,8 @@ static int do_fp_store(struct instruction_op *op, unsigned long ea, } u;
nb = GETSIZE(op->type); + if (nb > sizeof(u)) + return -EINVAL; if (!address_ok(regs, ea, nb)) return -EFAULT; rn = op->reg; @@ -563,6 +567,9 @@ static nokprobe_inline int do_vec_load(int rn, unsigned long ea, u8 b[sizeof(__vector128)]; } u = {};
+ if (size > sizeof(u)) + return -EINVAL; + if (!address_ok(regs, ea & ~0xfUL, 16)) return -EFAULT; /* align to multiple of size */ @@ -590,6 +597,9 @@ static nokprobe_inline int do_vec_store(int rn, unsigned long ea, u8 b[sizeof(__vector128)]; } u;
+ if (size > sizeof(u)) + return -EINVAL; + if (!address_ok(regs, ea & ~0xfUL, 16)) return -EFAULT; /* align to multiple of size */