taskset: fix cpuset list parser
taskset hangs when executed with badly formatted cpuset list, for example: $ taskset -c 0--1 true The current cpuset list parser is pretty weak as based on scanf() without strings verification ("-1" as input for "%u" returns unexpected number). It seems faster and better to use strtoul() and isdigit(). Addresses: https://github.com/karelzak/util-linux/issues/77 Signed-off-by: Karel Zak <kzak@redhat.com>
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parent
06c141a99a
commit
65bcbf105b
32
lib/cpuset.c
32
lib/cpuset.c
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@ -260,6 +260,19 @@ int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize)
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return 0;
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}
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static int nextnumber(const char *str, char **end, unsigned int *result)
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{
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errno = 0;
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if (str == NULL || *str == '\0' || !isdigit(*str))
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return -EINVAL;
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*result = (unsigned int) strtoul(str, end, 10);
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if (errno)
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return -errno;
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if (str == *end)
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return -EINVAL;
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return 0;
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}
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/*
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* Parses string with list of CPU ranges.
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* Returns 0 on success.
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@ -272,7 +285,7 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
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{
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size_t max = cpuset_nbits(setsize);
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const char *p, *q;
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int r = 0;
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char *end = NULL;
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q = str;
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CPU_ZERO_S(setsize, set);
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@ -282,21 +295,24 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
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unsigned int b; /* end of range */
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unsigned int s; /* stride */
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const char *c1, *c2;
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char c;
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if ((r = sscanf(p, "%u%c", &a, &c)) < 1)
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if (nextnumber(p, &end, &a) != 0)
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return 1;
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b = a;
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s = 1;
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p = end;
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c1 = nexttoken(p, '-');
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c2 = nexttoken(p, ',');
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if (c1 != NULL && (c2 == NULL || c1 < c2)) {
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if ((r = sscanf(c1, "%u%c", &b, &c)) < 1)
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if (nextnumber(c1, &end, &b) != 0)
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return 1;
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c1 = nexttoken(c1, ':');
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c1 = end && *end ? nexttoken(end, ':') : NULL;
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if (c1 != NULL && (c2 == NULL || c1 < c2)) {
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if ((r = sscanf(c1, "%u%c", &s, &c)) < 1)
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if (nextnumber(c1, &end, &s) != 0)
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return 1;
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if (s == 0)
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return 1;
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@ -313,7 +329,7 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
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}
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}
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if (r == 2)
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if (end && *end)
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return 1;
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return 0;
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}
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@ -390,7 +406,7 @@ int main(int argc, char *argv[])
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usage_err:
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fprintf(stderr,
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"usage: %s [--ncpus <num>] --mask <mask> | --range <list>",
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"usage: %s [--ncpus <num>] --mask <mask> | --range <list>\n",
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program_invocation_short_name);
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exit(EXIT_FAILURE);
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}
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