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From 7a151a3d74b2972410103b684803e6d6b8fda15b Mon Sep 17 00:00:00 2001
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From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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Date: Wed, 23 Nov 2016 14:13:34 +0900
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Subject: [PATCH 151/173] lsns: Fix parser for /proc/<pid>/stat which is
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including space in comm
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For example, child process of spamd has
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32031 (spamd child) S 32026 32026 32026 0 -1 4210752 338 0 0 0 ...
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fscanf("%d %*s %c %d*[^\n]") in read_process() can't parse above as we
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expected, because %s only skips non-whitespace. I.e. it parses like
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following,
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32031 (spamd child) S 32026 32026 32026 0 -1 4210752 338 0 0 0 ...
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+---+ +----+ +
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%d %*s %c
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and returns 2 (pid=32031, state=c).
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This fixes it by skipping task->comm part manually.
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1543428
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Upstream: http://github.com/karelzak/util-linux/commit/3fcbd7978980dc1a29c626b701333e27599e506d
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Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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---
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sys-utils/lsns.c | 30 ++++++++++++++++++++++++++----
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1 file changed, 26 insertions(+), 4 deletions(-)
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diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
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index b8841b7a3..d32756508 100644
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--- a/sys-utils/lsns.c
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+++ b/sys-utils/lsns.c
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@@ -217,6 +217,30 @@ static int get_ns_ino(int dir, const char *nsname, ino_t *ino)
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return 0;
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}
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+static int parse_proc_stat(FILE *fp, pid_t *pid, char *state, pid_t *ppid)
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+{
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+ char *line = NULL, *p;
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+ size_t len = 0;
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+ int rc;
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+
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+ if (getline(&line, &len, fp) < 0) {
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+ rc = -errno;
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+ goto error;
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+ }
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+
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+ p = strrchr(line, ')');
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+ if (p == NULL ||
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+ sscanf(line, "%d (", pid) != 1 ||
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+ sscanf(p, ") %c %d*[^\n]", state, ppid) != 2) {
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+ rc = -EINVAL;
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+ goto error;
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+ }
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+ rc = 0;
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+
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+error:
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+ free(line);
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+ return rc;
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+}
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static int read_process(struct lsns *ls, pid_t pid)
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{
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@@ -255,11 +279,9 @@ static int read_process(struct lsns *ls, pid_t pid)
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rc = -errno;
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goto done;
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}
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- rc = fscanf(f, "%d %*s %c %d*[^\n]", &p->pid, &p->state, &p->ppid);
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- if (rc != 3) {
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- rc = rc < 0 ? -errno : -EINVAL;
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+ rc = parse_proc_stat(f, &p->pid, &p->state, &p->ppid);
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+ if (rc < 0)
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goto done;
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- }
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rc = 0;
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for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
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--
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2.14.4
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