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analyze: don't claim "@known" was an unlisted syscall

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It's a sycall group of our own definition, and the output is erroneous
to claim otherwise. Let's hide it.

This adds syscall_set_add() which is nicely symmetric to the existing
syscall_set_remove().

Follow-up for: 6d6a08547c03f96dc798cda1ef4a8d3013d292d5

(cherry picked from commit 950c0ed38935198a67a57c645e499555eaf006eb)
(cherry picked from commit 7822ae021b795f55f84499d00763e112229ac6b4)
This commit is contained in:
Lennart Poettering 2023-03-24 11:35:55 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 4b0ae9d418
commit f76e47b810
1 changed files with 29 additions and 8 deletions
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37
src/analyze/analyze-syscall-filter.c
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@ -58,17 +58,38 @@ static int load_kernel_syscalls(Set **ret) {
return 0;
}
static int syscall_set_add(Set **s, const SyscallFilterSet *set) {
const char *sc;
int r;
assert(s);
if (!set)
return 0;
NULSTR_FOREACH(sc, set->value) {
if (sc[0] == '@')
continue;
r = set_put_strdup(s, sc);
if (r < 0)
return r;
}
return 0;
}
static void syscall_set_remove(Set *s, const SyscallFilterSet *set) {
const char *syscall;
const char *sc;
if (!set)
return;
NULSTR_FOREACH(syscall, set->value) {
if (syscall[0] == '@')
NULSTR_FOREACH(sc, set->value) {
if (sc[0] == '@')
continue;
free(set_remove(s, syscall));
free(set_remove(s, sc));
}
}
@ -88,17 +109,17 @@ static void dump_syscall_filter(const SyscallFilterSet *set) {
int verb_syscall_filters(int argc, char *argv[], void *userdata) {
bool first = true;
int r;
pager_open(arg_pager_flags);
if (strv_isempty(strv_skip(argv, 1))) {
_cleanup_set_free_ Set *kernel = NULL, *known = NULL;
const char *sys;
int k = 0; /* explicit initialization to appease gcc */
NULSTR_FOREACH(sys, syscall_filter_sets[SYSCALL_FILTER_SET_KNOWN].value)
if (set_put_strdup(&known, sys) < 0)
return log_oom();
r = syscall_set_add(&known, syscall_filter_sets + SYSCALL_FILTER_SET_KNOWN);
if (r < 0)
return log_error_errno(r, "Failed to prepare set of known system calls: %m");
if (!arg_quiet)
k = load_kernel_syscalls(&kernel);