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[Bug libc/12874] New: Wrong assumption in sysdeps/wordsize-64/tst-writev.c
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Fri, 10 Jun 2011 17:25:00 +0000
- Subject: [Bug libc/12874] New: Wrong assumption in sysdeps/wordsize-64/tst-writev.c
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=12874
Summary: Wrong assumption in sysdeps/wordsize-64/tst-writev.c
Product: glibc
Version: 2.14
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper.fsp@gmail.com
ReportedBy: hjl.tools@gmail.com
sysdeps/wordsize-64/tst-writev.c has
/* writev() should report that it has written EXPECTED number of bytes. */
#define EXPECTED ((size_t) INT32_MAX + 1)
...
/* Write junk to /dev/null with the writev syscall in order to get a return
of INT32_MAX+1 bytes to verify that the INTERNAL_SYSCALL wrappers aren't
mangling the result if the signbit of a 32-bit number is set. */
ssize_t ret = writev (fd, iv, IOV_MAX);
free (iv[0].iov_base);
close (fd);
if (ret != (ssize_t) EXPECTED)
{
printf ("writev() return value: %zd != EXPECTED: %zd\n", ret, EXPECTED);
return 1;
}
But kernel 2.6.38 has imposed a limit of (currently) 2 GiB-one page
for an individual I/O in order to avoid certain classes of security
problems.
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