From 0b8c0ec7eedcd8f9f1a1f238d87f9b512b09e71a Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 2 Dec 2019 08:50:00 -0700 Subject: [PATCH] io_uring: use current task creds instead of allocating a new one syzbot reports: kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 9217 Comm: io_uring-sq Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline] RIP: 0010:__validate_creds include/linux/cred.h:187 [inline] RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550 Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318 RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010 RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849 R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000 R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_sq_thread+0x1c7/0xa20 fs/io_uring.c:3274 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace f2e1a4307fbe2245 ]--- RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline] RIP: 0010:__validate_creds include/linux/cred.h:187 [inline] RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550 Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318 RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010 RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849 R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000 R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 which is caused by slab fault injection triggering a failure in prepare_creds(). We don't actually need to create a copy of the creds as we're not modifying it, we just need a reference on the current task creds. This avoids the failure case as well, and propagates the const throughout the stack. Fixes: 181e448d8709 ("io_uring: async workers should inherit the user creds") Reported-by: syzbot+5320383e16029ba057ff@syzkaller.appspotmail.com Signed-off-by: Jens Axboe --- fs/io-wq.c | 2 +- fs/io-wq.h | 2 +- fs/io_uring.c | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/io-wq.c b/fs/io-wq.c index 91b85df0861e..74b40506c5d9 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -111,7 +111,7 @@ struct io_wq { struct task_struct *manager; struct user_struct *user; - struct cred *creds; + const struct cred *creds; struct mm_struct *mm; refcount_t refs; struct completion done; diff --git a/fs/io-wq.h b/fs/io-wq.h index 600e0158cba7..dd0af0d7376c 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -87,7 +87,7 @@ typedef void (put_work_fn)(struct io_wq_work *); struct io_wq_data { struct mm_struct *mm; struct user_struct *user; - struct cred *creds; + const struct cred *creds; get_work_fn *get_work; put_work_fn *put_work; diff --git a/fs/io_uring.c b/fs/io_uring.c index ec53aa7cdc94..5cab7a047317 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -238,7 +238,7 @@ struct io_ring_ctx { struct user_struct *user; - struct cred *creds; + const struct cred *creds; /* 0 is for ctx quiesce/reinit/free, 1 is for sqo_thread started */ struct completion *completions; @@ -4759,7 +4759,7 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) ctx->compat = in_compat_syscall(); ctx->account_mem = account_mem; ctx->user = user; - ctx->creds = prepare_creds(); + ctx->creds = get_current_cred(); ret = io_allocate_scq_urings(ctx, p); if (ret) -- GitLab