[PATCH v3 21/25] ptrace: adapt ptrace_may_access() to always uses unmapped fsids
From: Christian Brauner <hidden>
Date: 2020-02-18 14:37:52
Also in:
linux-fsdevel, linux-security-module, lkml
Subsystem:
ptrace support, the rest · Maintainers:
Oleg Nesterov, Linus Torvalds
ptrace_may_access() with PTRACE_MODE_FSCREDS is only used with proc and proc wants to use the unmapped fsids. Suggested-by: Jann Horn <jannh@google.com> Signed-off-by: Christian Brauner <redacted> --- /* v2 */ patch added /* v3 */ unchanged --- kernel/ptrace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 43d6179508d6..3734713cc0dd 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c@@ -304,8 +304,8 @@ static int __ptrace_may_access(struct task_struct *task, unsigned int mode) return 0; rcu_read_lock(); if (mode & PTRACE_MODE_FSCREDS) { - caller_uid = cred->fsuid; - caller_gid = cred->fsgid; + caller_uid = cred->kfsuid; + caller_gid = cred->kfsgid; } else { /* * Using the euid would make more sense here, but something
--
2.25.0