Le 14/09/2016 à 22:19, Aleksandar Markovic a écrit : > From: Aleksandar Markovic <aleksandar.marko...@imgtec.com> > > do_socketcall() function in Qemu's syscalls.c is implemented to mirror > corespondant implementation of socketcall() in Linux kernel. (see kernel > source file net/socket.c, definition of socketcall). > > However, error codes are wrong for the cases of invalid values of the first > argument. This patch in this sense brings do_socketcall() closer to its > kernel counterpart. > > Also, this patch fixes failure of LTP test socketcall02, if executed on some > Qemu emulated sywstems (uer mode). > > Signed-off-by: Aleksandar Markovic <aleksandar.marko...@imgtec.com> > --- > linux-user/syscall.c | 21 ++++++++++++--------- > 1 file changed, 12 insertions(+), 9 deletions(-) > > diff --git a/linux-user/syscall.c b/linux-user/syscall.c > index bdc12ae..4ffcce5 100644 > --- a/linux-user/syscall.c > +++ b/linux-user/syscall.c > @@ -3845,15 +3845,18 @@ static abi_long do_socketcall(int num, abi_ulong vptr) > [SOCKOP_getsockopt] = 5, /* sockfd, level, optname, optval, optlen > */ > }; > abi_long a[6]; /* max 6 args */ > + unsigned i; > > - /* first, collect the arguments in a[] according to ac[] */ > - if (num >= 0 && num < ARRAY_SIZE(ac)) { > - unsigned i; > - assert(ARRAY_SIZE(a) >= ac[num]); /* ensure we have space for args */ > - for (i = 0; i < ac[num]; ++i) { > - if (get_user_ual(a[i], vptr + i * sizeof(abi_long)) != 0) { > - return -TARGET_EFAULT; > - } > + /* check the range of the first argument num */ > + if (num < 0 || num > ARRAY_SIZE(ac)) { > + return -TARGET_EINVAL; > + }
I'm not sure you can check this using the array index. kernel checks against "num" value, i.e.: if (num < 1 || num > SOCKOP_sendmmsg) { return -TARGET_EINVAL; } > + /* collect the arguments in a[] according to ac[] */ > + assert(ARRAY_SIZE(a) >= ac[num]); /* ensure we have space for args */ instead, do this like the kernel does: if (ac[num] > ARRAY_SIZE(a)) { return -TARGET_EINVAL; } > + for (i = 0; i < ac[num]; ++i) { > + if (get_user_ual(a[i], vptr + i * sizeof(abi_long)) != 0) { > + return -TARGET_EFAULT; > } > } > > @@ -3901,7 +3904,7 @@ static abi_long do_socketcall(int num, abi_ulong vptr) > return do_getsockopt(a[0], a[1], a[2], a[3], a[4]); > default: > gemu_log("Unsupported socketcall: %d\n", num); > - return -TARGET_ENOSYS; > + return -TARGET_EINVAL; > } > } > #endif >