From: Ian Rogers Date: Sat, 7 Oct 2023 04:44:38 +0000 (-0700) Subject: bpftool: Align output skeleton ELF code X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=23671f4dfd10b48b4a2fee4768886f0d8ec55b7e;p=linux.git bpftool: Align output skeleton ELF code libbpf accesses the ELF data requiring at least 8 byte alignment, however, the data is generated into a C string that doesn't guarantee alignment. Fix this by assigning to an aligned char array. Use sizeof on the array, less one for the \0 terminator, rather than generating a constant. Fixes: a6cc6b34b93e ("bpftool: Provide a helper method for accessing skeleton's embedded ELF data") Signed-off-by: Ian Rogers Signed-off-by: Andrii Nakryiko Reviewed-by: Alan Maguire Acked-by: Quentin Monnet Link: https://lore.kernel.org/bpf/20231007044439.25171-1-irogers@google.com --- diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index 04c47745b3ea5..882bf8e6e70e4 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -1209,7 +1209,7 @@ static int do_skeleton(int argc, char **argv) codegen("\ \n\ \n\ - s->data = %2$s__elf_bytes(&s->data_sz); \n\ + s->data = %1$s__elf_bytes(&s->data_sz); \n\ \n\ obj->skeleton = s; \n\ return 0; \n\ @@ -1218,12 +1218,12 @@ static int do_skeleton(int argc, char **argv) return err; \n\ } \n\ \n\ - static inline const void *%2$s__elf_bytes(size_t *sz) \n\ + static inline const void *%1$s__elf_bytes(size_t *sz) \n\ { \n\ - *sz = %1$d; \n\ - return (const void *)\"\\ \n\ - " - , file_sz, obj_name); + static const char data[] __attribute__((__aligned__(8))) = \"\\\n\ + ", + obj_name + ); /* embed contents of BPF object file */ print_hex(obj_data, file_sz); @@ -1231,6 +1231,9 @@ static int do_skeleton(int argc, char **argv) codegen("\ \n\ \"; \n\ + \n\ + *sz = sizeof(data) - 1; \n\ + return (const void *)data; \n\ } \n\ \n\ #ifdef __cplusplus \n\