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Fix leaks and test for getpagesize() returning == -1

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- close file descriptors after use.
- Always munmap memory regions after mmap'ing them.
- Make sure getpagesize() returns a value greater than 0 and use a
  cached value instead of always calling getpagesize(3).

CID: 1331374-1331377, 1331653-1331662
Differential Revision: https://reviews.freebsd.org/D6011
MFC after: 2 weeks
Reported by: Coverity
Reviewed by: cem
Sponsored by: EMC / Isilon Storage Division
This commit is contained in:
Enji Cooper 2016-04-19 22:25:14 +00:00
parent 432157dc67
commit 410757a4f4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=298301
1 changed files with 35 additions and 21 deletions
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56
tests/sys/vm/mmap_test.c
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@ -91,8 +91,10 @@ static void
checked_mmap(int prot, int flags, int fd, int error, const char *msg)
{
void *p;
int pagesize;
p = mmap(NULL, getpagesize(), prot, flags, fd, 0);
ATF_REQUIRE((pagesize = getpagesize()) > 0);
p = mmap(NULL, pagesize, prot, flags, fd, 0);
if (p == MAP_FAILED) {
if (error == 0)
ATF_CHECK_MSG(0, "%s failed with errno %d", msg,
@ -103,18 +105,19 @@ checked_mmap(int prot, int flags, int fd, int error, const char *msg)
errno, error);
} else {
ATF_CHECK_MSG(error == 0, "%s succeeded", msg);
munmap(p, getpagesize());
munmap(p, pagesize);
}
}
ATF_TC_WITHOUT_HEAD(mmap__bad_arguments);
ATF_TC_BODY(mmap__bad_arguments, tc)
{
int devstatfd, shmfd, zerofd;
int devstatfd, pagesize, shmfd, zerofd;
ATF_REQUIRE((pagesize = getpagesize()) > 0);
ATF_REQUIRE((devstatfd = open("/dev/devstat", O_RDONLY)) >= 0);
ATF_REQUIRE((shmfd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0);
ATF_REQUIRE(ftruncate(shmfd, getpagesize()) == 0);
ATF_REQUIRE(ftruncate(shmfd, pagesize) == 0);
ATF_REQUIRE((zerofd = open("/dev/zero", O_RDONLY)) >= 0);
/* These should work. */
@ -171,6 +174,10 @@ ATF_TC_BODY(mmap__bad_arguments, tc)
*/
checked_mmap(PROT_READ, MAP_PRIVATE, devstatfd, EINVAL,
"MAP_PRIVATE of /dev/devstat");
close(devstatfd);
close(shmfd);
close(zerofd);
}
ATF_TC_WITHOUT_HEAD(mmap__dev_zero_private);
@ -178,22 +185,21 @@ ATF_TC_BODY(mmap__dev_zero_private, tc)
{
char *p1, *p2, *p3;
size_t i;
int fd;
int fd, pagesize;
ATF_REQUIRE((pagesize = getpagesize()) > 0);
ATF_REQUIRE((fd = open("/dev/zero", O_RDONLY)) >= 0);
p1 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
0);
p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
ATF_REQUIRE(p1 != MAP_FAILED);
p2 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
0);
p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
ATF_REQUIRE(p2 != MAP_FAILED);
for (i = 0; i < getpagesize(); i++)
for (i = 0; i < pagesize; i++)
ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
ATF_REQUIRE(memcmp(p1, p2, getpagesize()) == 0);
ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
p1[0] = 1;
@ -203,11 +209,15 @@ ATF_TC_BODY(mmap__dev_zero_private, tc)
ATF_REQUIRE(p1[0] == 1);
p3 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
0);
p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
ATF_REQUIRE(p3 != MAP_FAILED);
ATF_REQUIRE(p3[0] == 0);
munmap(p1, pagesize);
munmap(p2, pagesize);
munmap(p3, pagesize);
close(fd);
}
ATF_TC_WITHOUT_HEAD(mmap__dev_zero_shared);
@ -215,22 +225,21 @@ ATF_TC_BODY(mmap__dev_zero_shared, tc)
{
char *p1, *p2, *p3;
size_t i;
int fd;
int fd, pagesize;
ATF_REQUIRE((pagesize = getpagesize()) > 0);
ATF_REQUIRE((fd = open("/dev/zero", O_RDWR)) >= 0);
p1 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
0);
p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
ATF_REQUIRE(p1 != MAP_FAILED);
p2 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
0);
p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
ATF_REQUIRE(p2 != MAP_FAILED);
for (i = 0; i < getpagesize(); i++)
for (i = 0; i < pagesize; i++)
ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
ATF_REQUIRE(memcmp(p1, p2, getpagesize()) == 0);
ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
p1[0] = 1;
@ -240,11 +249,16 @@ ATF_TC_BODY(mmap__dev_zero_shared, tc)
ATF_REQUIRE(p1[0] == 1);
p3 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
0);
ATF_REQUIRE(p3 != MAP_FAILED);
ATF_REQUIRE(p3[0] == 0);
munmap(p1, pagesize);
munmap(p2, pagesize);
munmap(p3, pagesize);
close(fd);
}
ATF_TP_ADD_TCS(tp)