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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "coredump-util.h"
#include "extract-word.h"
#include "fileio.h"
#include "string-table.h"
#include "virt.h"
static const char *const coredump_filter_table[_COREDUMP_FILTER_MAX] = {
[COREDUMP_FILTER_PRIVATE_ANONYMOUS] = "private-anonymous",
[COREDUMP_FILTER_SHARED_ANONYMOUS] = "shared-anonymous",
[COREDUMP_FILTER_PRIVATE_FILE_BACKED] = "private-file-backed",
[COREDUMP_FILTER_SHARED_FILE_BACKED] = "shared-file-backed",
[COREDUMP_FILTER_ELF_HEADERS] = "elf-headers",
[COREDUMP_FILTER_PRIVATE_HUGE] = "private-huge",
[COREDUMP_FILTER_SHARED_HUGE] = "shared-huge",
[COREDUMP_FILTER_PRIVATE_DAX] = "private-dax",
[COREDUMP_FILTER_SHARED_DAX] = "shared-dax",
};
DEFINE_STRING_TABLE_LOOKUP(coredump_filter, CoredumpFilter);
int coredump_filter_mask_from_string(const char *s, uint64_t *ret) {
uint64_t m = 0;
assert(s);
assert(ret);
for (;;) {
_cleanup_free_ char *n = NULL;
CoredumpFilter v;
int r;
r = extract_first_word(&s, &n, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
if (streq(n, "default")) {
m |= COREDUMP_FILTER_MASK_DEFAULT;
continue;
}
if (streq(n, "all")) {
m = UINT64_MAX;
continue;
}
v = coredump_filter_from_string(n);
if (v >= 0) {
m |= 1u << v;
continue;
}
uint64_t x;
r = safe_atoux64(n, &x);
if (r < 0)
return r;
m |= x;
}
*ret = m;
return 0;
}
int set_coredump_filter(uint64_t value) {
char t[STRLEN("0xFFFFFFFF")];
sprintf(t, "0x%"PRIx64, value);
return write_string_file("/proc/self/coredump_filter", t,
WRITE_STRING_FILE_VERIFY_ON_FAILURE|WRITE_STRING_FILE_DISABLE_BUFFER);
}
/* Turn off core dumps but only if we're running outside of a container. */
void disable_coredumps(void) {
int r;
if (detect_container() > 0)
return;
r = write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
log_debug_errno(r, "Failed to turn off coredumps, ignoring: %m");
}
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