On Sun 2015-04-12 21:15:54, Minfei Huang wrote: > For now, the kallsyms will only store the first (KSYM_NAME_LEN-1). The > kallsyms name is same for the function which first (KSYM_NAME_LEN-1) is > same, but the rest is not. > > Then function will never be patched, although function name and address > are provided both. The reason caused this bug is livepatch cannt > recognize the function name. > > Now, livepatch will verify the function name with first (KSYM_NAME_LEN-1) > and address, if provided. Once they are matched, we can confirm that the > patched function is found. This patch kind of make sense for vmlinux addresses. But are there functions with such a long names (>128 characters)? I hope not. They would never fit 80 characters per-line. In each case, it does not make sense for modules because we are not able to find the symbol via old_addr. Best Regards, Petr > Signed-off-by: Minfei Huang <minfei.huang@xxxxxxxxxxx> > --- > kernel/livepatch/core.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c > index ff42c29..eed719d 100644 > --- a/kernel/livepatch/core.c > +++ b/kernel/livepatch/core.c > @@ -210,7 +210,7 @@ static int klp_verify_vmlinux_callback(void *data, const char *name, > struct klp_verify_args *args = data; > > if (!mod && > - !strcmp(args->name, name) && > + !strncmp(args->name, name, KSYM_NAME_LEN-1) && > args->addr == addr) > return 1; > > @@ -226,7 +226,7 @@ static int klp_verify_module_callback(void *data, const char *name, > return 0; > > if (!strcmp(args->objname, mod->name) && > - !strcmp(args->name, name) && > + !strncmp(args->name, name, KSYM_NAME_LEN-1) && > args->addr == addr) > return 1; > > -- > 2.2.2 > > -- > 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 -- 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
