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authorAlexei Starovoitov <ast@plumgrid.com>2014-05-15 15:56:38 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-16 16:44:08 -0400
commited4afd451f12ea57f9aaaf6f8442eee7e415fa1a (patch)
tree2532887c7f3077036a36ef5f60b44c16099f9d66 /tools/net/bpf_jit_disasm.c
parentMerge branch 'systemport-next' (diff)
downloadlinux-dev-ed4afd451f12ea57f9aaaf6f8442eee7e415fa1a.tar.xz
linux-dev-ed4afd451f12ea57f9aaaf6f8442eee7e415fa1a.zip
tools: bpf_jit_disasm: ignore image address for disasm
seccomp filters use kernel JIT image addresses, so bpf_jit_enable=2 prints [ 20.146438] flen=3 proglen=82 pass=0 image=0000000000000000 [ 20.146442] JIT code: 00000000: 55 48 89 e5 48 81 ec 28 02 00 00 ... ignore image address, so that seccomp filters can be disassembled Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/net/bpf_jit_disasm.c')
-rw-r--r--tools/net/bpf_jit_disasm.c18
1 files changed, 8 insertions, 10 deletions
diff --git a/tools/net/bpf_jit_disasm.c b/tools/net/bpf_jit_disasm.c
index cfe0cdcda3de..d9730c3319b9 100644
--- a/tools/net/bpf_jit_disasm.c
+++ b/tools/net/bpf_jit_disasm.c
@@ -43,8 +43,7 @@ static void get_exec_path(char *tpath, size_t size)
free(path);
}
-static void get_asm_insns(uint8_t *image, size_t len, unsigned long base,
- int opcodes)
+static void get_asm_insns(uint8_t *image, size_t len, int opcodes)
{
int count, i, pc = 0;
char tpath[256];
@@ -107,13 +106,13 @@ static void put_klog_buff(char *buff)
}
static int get_last_jit_image(char *haystack, size_t hlen,
- uint8_t *image, size_t ilen,
- unsigned long *base)
+ uint8_t *image, size_t ilen)
{
char *ptr, *pptr, *tmp;
off_t off = 0;
int ret, flen, proglen, pass, ulen = 0;
regmatch_t pmatch[1];
+ unsigned long base;
regex_t regex;
if (hlen == 0)
@@ -136,7 +135,7 @@ static int get_last_jit_image(char *haystack, size_t hlen,
ptr = haystack + off - (pmatch[0].rm_eo - pmatch[0].rm_so);
ret = sscanf(ptr, "flen=%d proglen=%d pass=%d image=%lx",
- &flen, &proglen, &pass, base);
+ &flen, &proglen, &pass, &base);
if (ret != 4)
return 0;
@@ -162,7 +161,7 @@ static int get_last_jit_image(char *haystack, size_t hlen,
assert(ulen == proglen);
printf("%d bytes emitted from JIT compiler (pass:%d, flen:%d)\n",
proglen, pass, flen);
- printf("%lx + <x>:\n", *base);
+ printf("%lx + <x>:\n", base);
regfree(&regex);
return ulen;
@@ -172,7 +171,6 @@ int main(int argc, char **argv)
{
int len, klen, opcodes = 0;
char *kbuff;
- unsigned long base;
uint8_t image[4096];
if (argc > 1) {
@@ -189,9 +187,9 @@ int main(int argc, char **argv)
kbuff = get_klog_buff(&klen);
- len = get_last_jit_image(kbuff, klen, image, sizeof(image), &base);
- if (len > 0 && base > 0)
- get_asm_insns(image, len, base, opcodes);
+ len = get_last_jit_image(kbuff, klen, image, sizeof(image));
+ if (len > 0)
+ get_asm_insns(image, len, opcodes);
put_klog_buff(kbuff);