From 044455df76969ad26dfdcfa186e5ce81beb5b527 Mon Sep 17 00:00:00 2001

From: Lennart Poettering <lennart@poettering.net>

Date: Tue, 10 Nov 2015 16:08:03 +0100

Subject: [PATCH] core: simplify parsing of capability bounding set settings

Let's generate a simple error, and that's it. Let's not try to be smart

and record the last word that failed.

Also, let's make sure we don't compare numeric values with 0 by relying

on C's downgrade-to-bool feature, as suggested in CODING_STYLE.

Cherry-picked from: 65dce26488030eff078c498673d5d93e3c87b6a1

Resolves: #1387398

---

 src/core/load-fragment.c | 42 +++++++++++++++++++-----------------------

 1 file changed, 19 insertions(+), 23 deletions(-)

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c

index 4830d7a..ab3b0c2 100644

--- a/src/core/load-fragment.c

+++ b/src/core/load-fragment.c

@@ -1015,23 +1015,22 @@ int config_parse_exec_secure_bits(const char *unit,

         return 0;

 }

-int config_parse_bounding_set(const char *unit,

-                              const char *filename,

-                              unsigned line,

-                              const char *section,

-                              unsigned section_line,

-                              const char *lvalue,

-                              int ltype,

-                              const char *rvalue,

-                              void *data,

-                              void *userdata) {

+int config_parse_bounding_set(

+                const char *unit,

+                const char *filename,

+                unsigned line,

+                const char *section,

+                unsigned section_line,

+                const char *lvalue,

+                int ltype,

+                const char *rvalue,

+                void *data,

+                void *userdata) {

         uint64_t *capability_bounding_set_drop = data;

-        uint64_t capability_bounding_set;

+        uint64_t capability_bounding_set, sum = 0;

         bool invert = false;

-        uint64_t sum = 0;

-        const char *prev;

-        const char *cur;

+        const char *p;

         assert(filename);

         assert(lvalue);

@@ -1048,35 +1047,32 @@ int config_parse_bounding_set(const char *unit,

          * non-inverted everywhere to have a fully normalized

          * interface. */

-        prev = cur = rvalue;

+        p = rvalue;

         for (;;) {

                 _cleanup_free_ char *word = NULL;

-                int cap;

-                int r;

+                int cap, r;

-                r = extract_first_word(&cur, &word, NULL, EXTRACT_QUOTES);

+                r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);

                 if (r == 0)

                         break;

                 if (r == -ENOMEM)

                         return log_oom();

                 if (r < 0) {

-                        log_syntax(unit, LOG_ERR, filename, line, r, "Trailing garbage in bounding set, ignoring: %s", prev);

+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse word, ignoring: %s", rvalue);

                         break;

                 }

                 cap = capability_from_name(word);

                 if (cap < 0) {

                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse capability in bounding set, ignoring: %s", word);

-                        prev = cur;

                         continue;

                 }

-                sum |= ((uint64_t) 1ULL) << (uint64_t) cap;

-                prev = cur;

+                sum |= ((uint64_t) UINT64_C(1)) << (uint64_t) cap;

         }

         capability_bounding_set = invert ? ~sum : sum;

-        if (*capability_bounding_set_drop && capability_bounding_set)

+        if (*capability_bounding_set_drop != 0 && capability_bounding_set != 0)

                 *capability_bounding_set_drop = ~(~*capability_bounding_set_drop | capability_bounding_set);

         else

                 *capability_bounding_set_drop = ~capability_bounding_set;