diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2018-01-13 16:10:07 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-01-17 19:36:43 +0000 |
| commit | d1220efd23484c72c82d5471f05daeb35b5d1916 (patch) | |
| tree | ad26dd35eea603c5bc13512692179a67ebc57aab /arch/arm | |
| parent | f4483f2cc1fdc03488c8a1452e545545ae5bda93 (diff) | |
ARM: net: bpf: fix stack alignment
As per 2dede2d8e925 ("ARM EABI: stack pointer must be 64-bit aligned
after a CPU exception") the stack should be aligned to a 64-bit boundary
on EABI systems. Ensure that the eBPF JIT appropraitely aligns the
stack.
Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index ce36d2cab50c..d00a0eb0386e 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -179,8 +179,13 @@ static void jit_fill_hole(void *area, unsigned int size) *ptr++ = __opcode_to_mem_arm(ARM_INST_UDF); } -/* Stack must be multiples of 16 Bytes */ -#define STACK_ALIGN(sz) (((sz) + 3) & ~3) +#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5) +/* EABI requires the stack to be aligned to 64-bit boundaries */ +#define STACK_ALIGNMENT 8 +#else +/* Stack must be aligned to 32-bit boundaries */ +#define STACK_ALIGNMENT 4 +#endif /* Stack space for BPF_REG_2, BPF_REG_3, BPF_REG_4, * BPF_REG_5, BPF_REG_7, BPF_REG_8, BPF_REG_9, @@ -194,7 +199,7 @@ static void jit_fill_hole(void *area, unsigned int size) + SCRATCH_SIZE + \ + 4 /* extra for skb_copy_bits buffer */) -#define STACK_SIZE STACK_ALIGN(_STACK_SIZE) +#define STACK_SIZE ALIGN(_STACK_SIZE, STACK_ALIGNMENT) /* Get the offset of eBPF REGISTERs stored on scratch space. */ #define STACK_VAR(off) (STACK_SIZE-off-4) |