From: Andi Kleen Date: Mon, 1 May 2006 19:15:48 +0000 (-0700) Subject: [PATCH] x86_64: Add compat_sys_vmsplice and use it in x86-64 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d2610202290b4924b71747314a0f88f28807702e;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] x86_64: Add compat_sys_vmsplice and use it in x86-64 Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S index 57fc37e0fb9..5a92fed2d1d 100644 --- a/arch/x86_64/ia32/ia32entry.S +++ b/arch/x86_64/ia32/ia32entry.S @@ -695,4 +695,5 @@ ia32_sys_call_table: .quad sys_splice .quad sys_sync_file_range .quad sys_tee + .quad compat_sys_vmsplice ia32_syscall_end: diff --git a/fs/compat.c b/fs/compat.c index 2e32bd34047..3f3e8f4d43d 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1317,6 +1317,26 @@ out: return ret; } +asmlinkage long +compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, + unsigned int nr_segs, unsigned int flags) +{ + unsigned i; + struct iovec *iov; + if (nr_segs >= UIO_MAXIOV) + return -EINVAL; + iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); + for (i = 0; i < nr_segs; i++) { + struct compat_iovec v; + if (get_user(v.iov_base, &iov32[i].iov_base) || + get_user(v.iov_len, &iov32[i].iov_len) || + put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || + put_user(v.iov_len, &iov[i].iov_len)) + return -EFAULT; + } + return sys_vmsplice(fd, iov, nr_segs, flags); +} + /* * Exactly like fs/open.c:sys_open(), except that it doesn't set the * O_LARGEFILE flag.