bpf_jit.S has several callable non-leaf functions which don't honor CONFIG_FRAME_POINTER, which can result in bad stack traces. Create a stack frame before the call instructions when CONFIG_FRAME_POINTER is enabled. Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Alexei Starovoitov <ast@xxxxxxxxxx> Cc: netdev@xxxxxxxxxxxxxxx --- arch/x86/net/bpf_jit.S | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/x86/net/bpf_jit.S b/arch/x86/net/bpf_jit.S index eb4a3bd..f2a7faf 100644 --- a/arch/x86/net/bpf_jit.S +++ b/arch/x86/net/bpf_jit.S @@ -8,6 +8,7 @@ * of the License. */ #include <linux/linkage.h> +#include <asm/frame.h> /* * Calling convention : @@ -65,16 +66,18 @@ FUNC(sk_load_byte_positive_offset) /* rsi contains offset and can be scratched */ #define bpf_slow_path_common(LEN) \ + lea -MAX_BPF_STACK + 32(%rbp), %rdx;\ + FRAME_BEGIN; \ mov %rbx, %rdi; /* arg1 == skb */ \ push %r9; \ push SKBDATA; \ /* rsi already has offset */ \ mov $LEN,%ecx; /* len */ \ - lea - MAX_BPF_STACK + 32(%rbp),%rdx; \ call skb_copy_bits; \ test %eax,%eax; \ pop SKBDATA; \ - pop %r9; + pop %r9; \ + FRAME_END bpf_slow_path_word: @@ -99,6 +102,7 @@ bpf_slow_path_byte: ret #define sk_negative_common(SIZE) \ + FRAME_BEGIN; \ mov %rbx, %rdi; /* arg1 == skb */ \ push %r9; \ push SKBDATA; \ @@ -108,6 +112,7 @@ bpf_slow_path_byte: test %rax,%rax; \ pop SKBDATA; \ pop %r9; \ + FRAME_END; \ jz bpf_error bpf_slow_path_word_neg: -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
