diff mbox series

[v6,3/9] security: Replace memcpy() with get_task_comm()

Message ID 20240812022933.69850-4-laoar.shao@gmail.com (mailing list archive)
State Superseded
Headers show
Series Improve the copy of task comm | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 29 this patch: 29
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 29 this patch: 29
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 29 this patch: 29
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 24 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 2 this patch: 2
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-VM_Test-24 success Logs for x86_64-gcc / test (test_progs_no_alu32_parallel, true, 30) / test_progs_no_alu32_parallel on x86_64 with gcc
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Commit Message

Yafang Shao Aug. 12, 2024, 2:29 a.m. UTC 
Quoted from Linus [0]:

  selinux never wanted a lock, and never wanted any kind of *consistent*
  result, it just wanted a *stable* result.

Using get_task_comm() to read the task comm ensures that the name is
always NUL-terminated, regardless of the source string. This approach also
facilitates future extensions to the task comm.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
LINK: https://lore.kernel.org/all/CAHk-=wivfrF0_zvf+oj6==Sh=-npJooP8chLPEfaFV0oNYTTBA@mail.gmail.com/ [0]
Acked-by: Paul Moore <paul@paul-moore.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: Ondrej Mosnacek <omosnace@redhat.com>
---
 security/lsm_audit.c         | 4 ++--
 security/selinux/selinuxfs.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 849e832719e2..9a8352972086 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -207,7 +207,7 @@  static void dump_common_audit_data(struct audit_buffer *ab,
 	BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
 
 	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
-	audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));
+	audit_log_untrustedstring(ab, get_task_comm(comm, current));
 
 	switch (a->type) {
 	case LSM_AUDIT_DATA_NONE:
@@ -302,7 +302,7 @@  static void dump_common_audit_data(struct audit_buffer *ab,
 				char comm[sizeof(tsk->comm)];
 				audit_log_format(ab, " opid=%d ocomm=", pid);
 				audit_log_untrustedstring(ab,
-				    memcpy(comm, tsk->comm, sizeof(comm)));
+				    get_task_comm(comm, tsk));
 			}
 		}
 		break;
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index e172f182b65c..57e014ff3076 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -708,7 +708,7 @@  static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 	if (new_value) {
 		char comm[sizeof(current->comm)];
 
-		memcpy(comm, current->comm, sizeof(comm));
+		strscpy(comm, current->comm, sizeof(comm));
 		pr_err("SELinux: %s (%d) set checkreqprot to 1. This is no longer supported.\n",
 		       comm, current->pid);
 	}