Zbigniew Jędrzejewski-Szmek
fd421c4adc
If the cleanup function returns the appropriate type, use that to reset the variable. For other functions (usually the foreign ones which return void), add an explicit value to reset to. This causes a bit of code churn, but I think it might be worth it. In a following patch static destructors will be called from a fuzzer, and this change allows them to be called multiple times. But I think such a change might help with detecting unitialized code reuse too. We hit various bugs like this, and things are more obvious when a pointer has been set to NULL. I was worried whether this change increases text size, but it doesn't seem to: -Dbuildtype=debug: before "tree-wide: return NULL from freeing functions": -rwxrwxr-x 1 zbyszek zbyszek 4117672 Feb 16 14:36 build/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 4494520 Feb 16 15:06 build/systemd* after "tree-wide: return NULL from freeing functions": -rwxrwxr-x 1 zbyszek zbyszek 4117672 Feb 16 14:36 build/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 4494576 Feb 16 15:10 build/systemd* now: -rwxrwxr-x 1 zbyszek zbyszek 4117672 Feb 16 14:36 build/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 4494640 Feb 16 15:15 build/systemd* -Dbuildtype=release: before "tree-wide: return NULL from freeing functions": -rwxrwxr-x 1 zbyszek zbyszek 5252256 Feb 14 14:47 build-rawhide/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 1834184 Feb 16 15:09 build-rawhide/systemd* after "tree-wide: return NULL from freeing functions": -rwxrwxr-x 1 zbyszek zbyszek 5252256 Feb 14 14:47 build-rawhide/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 1834184 Feb 16 15:10 build-rawhide/systemd* now: -rwxrwxr-x 1 zbyszek zbyszek 5252256 Feb 14 14:47 build-rawhide/libsystemd.so.0.30.0* -rwxrwxr-x 1 zbyszek zbyszek 1834184 Feb 16 15:16 build-rawhide/systemd* I would expect that the compiler would be able to elide the setting of a variable if the variable is never used again. And this seems to be the case: in optimized builds there is no change in size whatsoever. And the change in size in unoptimized build is negligible. Something strange is happening with size of libsystemd: it's bigger in optimized builds. Something to figure out, but unrelated to this patch.
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <errno.h>
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#include <unistd.h>
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#if HAVE_ACL
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#include <acl/libacl.h>
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#include <stdbool.h>
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#include <sys/acl.h>
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#include "macro.h"
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int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry);
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int calc_acl_mask_if_needed(acl_t *acl_p);
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int add_base_acls_if_needed(acl_t *acl_p, const char *path);
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int acl_search_groups(const char* path, char ***ret_groups);
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int parse_acl(const char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask);
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int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl);
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int fd_add_uid_acl_permission(int fd, uid_t uid, unsigned mask);
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/* acl_free takes multiple argument types.
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* Multiple cleanup functions are necessary. */
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(acl_t, acl_free, NULL);
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#define acl_free_charp acl_free
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(char*, acl_free_charp, NULL);
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#define acl_free_uid_tp acl_free
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(uid_t*, acl_free_uid_tp, NULL);
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#define acl_free_gid_tp acl_free
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(gid_t*, acl_free_gid_tp, NULL);
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#else
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#define ACL_READ 0x04
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#define ACL_WRITE 0x02
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#define ACL_EXECUTE 0x01
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static inline int fd_add_uid_acl_permission(int fd, uid_t uid, unsigned mask) {
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return -EOPNOTSUPP;
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}
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#endif
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