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authorJames Hogan <james.hogan@imgtec.com>2012-05-17 12:42:54 +0100
committerMike Frysinger <vapier@gentoo.org>2012-05-21 22:20:04 -0400
commita8908c3517cc93249bb6ec2c693cf80874c7f629 (patch)
treef0267eed14eee1859deba63980bda7aaea6c774b /libc
parent8cfb43de636faa401634340d1a18404844f9ba5a (diff)
mmap()->sys_mmap2: do unsigned shift of offset
Fix the implementation of mmap based on the mmap2 system call, to construct pgoffset from offset with an unsigned shift rather than a signed (off_t) shift. The mmap2 test in the testsuite catches this case by mmap'ing with a large offset (with the sign bit set). The signed shift repeats the sign bit making the page shift way out of range. This is already fixed similarly in mmap64(). Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'libc')
-rw-r--r--libc/sysdeps/linux/common/mmap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/mmap.c b/libc/sysdeps/linux/common/mmap.c
index 89958985e..d53eabb18 100644
--- a/libc/sysdeps/linux/common/mmap.c
+++ b/libc/sysdeps/linux/common/mmap.c
@@ -63,7 +63,8 @@ __ptr_t mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offs
__set_errno(EINVAL);
return MAP_FAILED;
}
- return __syscall_mmap2(addr, len, prot, flags, fd, offset >> MMAP2_PAGE_SHIFT);
+ return __syscall_mmap2(addr, len, prot, flags,
+ fd, ((__u_long) offset >> MMAP2_PAGE_SHIFT));
}
libc_hidden_def(mmap)