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[PATCH 2/3] sys_mmap64()
- From: Yury Norov <ynorov at caviumnetworks dot com>
- To:
- Cc: Yury Norov <ynorov at caviumnetworks dot com>, Arnd Bergmann <arnd at arndb dot de>, "Dr. Philipp Tomsich" <philipp dot tomsich at theobroma-systems dot com>, Catalin Marinas <catalin dot marinas at arm dot com>, <libc-alpha at sourceware dot org>, <linux-arch at vger dot kernel dot org>, LKML <linux-kernel at vger dot kernel dot org>, <szabolcs dot nagy at arm dot com>, <heiko dot carstens at de dot ibm dot com>, <cmetcalf at ezchip dot com>, "Joseph S. Myers" <joseph at codesourcery dot com>, <zhouchengming1 at huawei dot com>, "Kapoor, Prasun" <Prasun dot Kapoor at caviumnetworks dot com>, Alexander Graf <agraf at suse dot de>, <geert at linux-m68k dot org>, <kilobyte at angband dot pl>, <manuel dot montezelo at gmail dot com>, Andrew Pinski <pinskia at gmail dot com>, <linyongting at huawei dot com>, Alexey Klimov <klimov dot linux at gmail dot com>, <broonie at kernel dot org>, "Zhangjian (Bamvor)" <bamvor dot zhangjian at huawei dot com>, linux-arm-kernel <linux-arm-kernel at lists dot infradead dot org>, Maxim Kuvyrkov <maxim dot kuvyrkov at linaro dot org>, Nathan Lynch <Nathan_Lynch at mentor dot com>, Martin Schwidefsky <schwidefsky at de dot ibm dot com>, <davem at davemloft dot net>, <christoph dot muellner at theobroma-systems dot com>
- Date: Sun, 11 Dec 2016 18:26:41 +0530
- Subject: [PATCH 2/3] sys_mmap64()
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- Authentication-results: spf=none (sender IP is ) smtp.mailfrom=Yuri dot Norov at caviumnetworks dot com;
- References: <1481461003-14361-1-git-send-email-ynorov@caviumnetworks.com>
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Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
include/linux/syscalls.h | 3 +++
include/uapi/asm-generic/unistd.h | 4 +++-
mm/mmap.c | 25 +++++++++++++++++++++++++
3 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 91a740f..869ca76 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -857,6 +857,9 @@ asmlinkage long sys_perf_event_open(
asmlinkage long sys_mmap_pgoff(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff);
+asmlinkage long sys_mmap64(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long long *offset);
asmlinkage long sys_old_mmap(struct mmap_arg_struct __user *arg);
asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name,
struct file_handle __user *handle,
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index d65e232..f9ca919 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -734,9 +734,11 @@ __SYSCALL(__NR_pkey_mprotect, sys_pkey_mprotect)
__SYSCALL(__NR_pkey_alloc, sys_pkey_alloc)
#define __NR_pkey_free 290
__SYSCALL(__NR_pkey_free, sys_pkey_free)
+#define __NR_mmap64 291
+__SYSCALL(__NR_mmap64, sys_mmap64)
#undef __NR_syscalls
-#define __NR_syscalls 291
+#define __NR_syscalls 292
/*
* All syscalls below here should go away really,
diff --git a/mm/mmap.c b/mm/mmap.c
index fc1c943..6c6b95a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1504,6 +1504,31 @@ static int mmap_pgoff_prepare(struct file **f, unsigned long *l,
return 0;
}
+SYSCALL_DEFINE6(mmap64, unsigned long, addr, unsigned long, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, unsigned long long __user *, offset)
+{
+ int err;
+ unsigned long long koffset;
+ unsigned long retval;
+ struct file *file = NULL;
+
+ if (copy_from_user(&koffset, offset, sizeof(koffset)))
+ return -EFAULT;
+ if (offset_in_page(koffset))
+ return -EINVAL;
+
+ err = mmap_pgoff_prepare(&file, &len, &flags, fd);
+ if (err)
+ return err;
+
+ retval = vm_mmap_pgoff(file, addr, len, prot,
+ flags, koffset >> PAGE_SHIFT);
+ if (file)
+ fput(file);
+ return retval;
+}
+
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, unsigned long, pgoff)
--
2.7.4