The patch titled
Subject: bpftool: ensure task comm is always NUL-terminated
has been added to the -mm mm-nonmm-unstable branch. Its filename is
bpftool-ensure-task-comm-is-always-nul-terminated.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bpftool-ensure-task-comm-is-always-nul-terminated.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yafang Shao <laoar.shao@xxxxxxxxx>
Subject: bpftool: ensure task comm is always NUL-terminated
Date: Mon, 7 Oct 2024 22:49:08 +0800
Let's explicitly ensure the destination string is NUL-terminated. This
way, it won't be affected by changes to the source string.
Link: https://lkml.kernel.org/r/20241007144911.27693-5-laoar.shao@xxxxxxxxx
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Reviewed-by: Quentin Monnet <qmo@xxxxxxxxxx>
Cc: Alejandro Colomar <alx@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Justin Stitt <justinstitt@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Matus Jokay <matus.jokay@xxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/bpf/bpftool/pids.c | 2 ++
1 file changed, 2 insertions(+)
--- a/tools/bpf/bpftool/pids.c~bpftool-ensure-task-comm-is-always-nul-terminated
+++ a/tools/bpf/bpftool/pids.c
@@ -54,6 +54,7 @@ static void add_ref(struct hashmap *map,
ref = &refs->refs[refs->ref_cnt];
ref->pid = e->pid;
memcpy(ref->comm, e->comm, sizeof(ref->comm));
+ ref->comm[sizeof(ref->comm) - 1] = '\0';
refs->ref_cnt++;
return;
@@ -77,6 +78,7 @@ static void add_ref(struct hashmap *map,
ref = &refs->refs[0];
ref->pid = e->pid;
memcpy(ref->comm, e->comm, sizeof(ref->comm));
+ ref->comm[sizeof(ref->comm) - 1] = '\0';
refs->ref_cnt = 1;
refs->has_bpf_cookie = e->has_bpf_cookie;
refs->bpf_cookie = e->bpf_cookie;
_
Patches currently in -mm which might be from laoar.shao@xxxxxxxxx are
get-rid-of-__get_task_comm.patch
auditsc-replace-memcpy-with-strscpy.patch
security-replace-memcpy-with-get_task_comm.patch
bpftool-ensure-task-comm-is-always-nul-terminated.patch
mm-util-fix-possible-race-condition-in-kstrdup.patch
mm-util-deduplicate-code-in-kstrdupkstrndupkmemdup_nul.patch
drm-replace-strcpy-with-strscpy.patch
