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| author | Kaleb S. KEITHLEY <kkeithle@redhat.com> | 2016-07-07 08:51:08 -0400 |
|---|---|---|
| committer | Jeff Darcy <jdarcy@redhat.com> | 2016-07-18 04:59:42 -0700 |
| commit | 561746080b0b7154bfb3bdee20d426cf2ef7db17 (patch) | |
| tree | 0dd0db913055925d7843d85c8066a7c0018a290a /libglusterfs/src/run.c | |
| parent | 73b9ede7e115fab245b0f59d18e4d6cc4d297cec (diff) | |
core: use readdir(3) with glibc, and associated cleanup
Starting with glibc-2.23 (i.e. what's in Fedora 25), readdir_r(3)
is marked as deprecated. Specifically the function decl in <dirent.h>
has the deprecated attribute, and now warnings are thrown during the
compile on Fedora 25 builds.
The readdir(_r)(3) man page (on Fedora 25 at least) and World+Dog say
that glibc's readdir(3) is, and always has been, MT-SAFE as long as
only one thread is accessing the directory object returned by opendir().
World+Dog also says there is a potential buffer overflow in readdir_r().
World+Dog suggests that it is preferable to simply use readdir(). There's
an implication that eventually readdir_r(3) will be removed from glibc.
POSIX has, apparently deprecated it in the standard, or even removed it
entirely.
Over and above that, our source near the various uses of readdir(_r)(3)
has a few unsafe uses of strcpy()+strcat().
(AFAIK nobody has looked at the readdir(3) implemenation in *BSD to see
if the same is true on those platforms, and we can't be sure of MacOS
even though we know it's based on *BSD.)
Change-Id: I5481f18ba1eebe7ee177895eecc9a80a71b60568
BUG: 1356998
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/14838
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Diffstat (limited to 'libglusterfs/src/run.c')
| -rw-r--r-- | libglusterfs/src/run.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libglusterfs/src/run.c b/libglusterfs/src/run.c index c625a5b99de..ff587f7e4de 100644 --- a/libglusterfs/src/run.c +++ b/libglusterfs/src/run.c @@ -277,11 +277,16 @@ runner_start (runner_t *runner) #ifdef GF_LINUX_HOST_OS DIR *d = NULL; struct dirent *de = NULL; + struct dirent scratch[2] = {{0,},}; char *e = NULL; d = sys_opendir ("/proc/self/fd"); if (d) { - while ((de = sys_readdir (d))) { + for (;;) { + errno = 0; + de = sys_readdir (d, scratch); + if (!de || errno != 0) + break; i = strtoul (de->d_name, &e, 10); if (*e == '\0' && i > 2 && i != dirfd (d) && i != xpi[1]) |