From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, yeohc@au1.ibm.com, jann@thejh.net
Subject: [PATCH] mm: relax ptrace mode in process_vm_readv(2)
Date: Sat, 3 Mar 2018 23:11:16 +0300 [thread overview]
Message-ID: <20180303201116.GA10031@avx2> (raw)
It is more natural to check for read-from-memory permissions in case of
process_vm_readv() as PTRACE_MODE_ATTACH is equivalent to write
permissions.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
mm/process_vm_access.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -204,7 +204,7 @@ static ssize_t process_vm_rw_core(pid_t pid, struct iov_iter *iter,
goto free_proc_pages;
}
- mm = mm_access(task, PTRACE_MODE_ATTACH_REALCREDS);
+ mm = mm_access(task, vm_write ? PTRACE_MODE_ATTACH_REALCREDS : PTRACE_MODE_READ_REALCREDS);
if (!mm || IS_ERR(mm)) {
rc = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH;
/*
next reply other threads:[~2018-03-03 20:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-03 20:11 Alexey Dobriyan [this message]
2018-03-06 0:07 ` [PATCH] mm: relax ptrace mode in process_vm_readv(2) Andrew Morton
2018-03-06 17:44 ` Alexey Dobriyan
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