linux-kernel - [PATCH 05/10] [elf][regset] simplify thread list handling in fill_note

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221029231850.3668437-5-viro@zeniv.linux.org.uk>
Date:   Sun, 30 Oct 2022 00:18:45 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     linux-arch@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] [elf][regset] simplify thread list handling in fill_note_info()

fill_note_info() iterates through the list of threads collected in
mm->core_state->dumper, allocating a struct elf_thread_core_info
instance for each and linking those into a list.

We need the entry corresponding to current to be first in the
resulting list, so the logics for list insertion is
	if it's for current or list is empty
		insert in the head
	else
		insert after the first element

However, in mm->core_state->dumper the entry for current is guaranteed
to be the first one.  Which means that both parts of condition will
be true on the first iteration and neither will be true on all subsequent
ones.

Taking the first iteration out of the loop simplifies things nicely...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/binfmt_elf.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 4190dafd2ec4..e990075fb43d 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1866,7 +1866,14 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 	/*
 	 * Allocate a structure for each thread.
 	 */
-	for (ct = &dump_task->signal->core_state->dumper; ct; ct = ct->next) {
+	info->thread = kzalloc(offsetof(struct elf_thread_core_info,
+				     notes[info->thread_notes]),
+			    GFP_KERNEL);
+	if (unlikely(!info->thread))
+		return 0;
+
+	info->thread->task = dump_task;
+	for (ct = dump_task->signal->core_state->dumper.next; ct; ct = ct->next) {
 		t = kzalloc(offsetof(struct elf_thread_core_info,
 				     notes[info->thread_notes]),
 			    GFP_KERNEL);
@@ -1874,17 +1881,8 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 			return 0;
 
 		t->task = ct->task;
-		if (ct->task == dump_task || !info->thread) {
-			t->next = info->thread;
-			info->thread = t;
-		} else {
-			/*
-			 * Make sure to keep the original task at
-			 * the head of the list.
-			 */
-			t->next = info->thread->next;
-			info->thread->next = t;
-		}
+		t->next = info->thread->next;
+		info->thread->next = t;
 	}
 
 	/*
-- 
2.30.2