From: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
To: Yury Norov <ynorov@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
David Laight <david.laight.linux@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-snps-arc@lists.infradead.org,
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Subject: [RFC PATCH v1 3/9] x86/umip: Be stricter in fixup_umip_exception()
Date: Mon, 27 Apr 2026 19:13:44 +0200 [thread overview]
Message-ID: <9e8e43d4f81d8f8b6f68311f1c6f859d718d36e4.1777306795.git.chleroy@kernel.org> (raw)
In-Reply-To: <cover.1777306795.git.chleroy@kernel.org>
fixup_umip_exception() calls copy_to_user() and checks whether
the returned value is strictly positive.
A subsequent patch will change the return of copy_to_user() to
return -EFAULT in case of error.
Change the test to checking that the result is not 0.
At the time being copy_to_user() return an unsigned value so
'strictly positive' is the same as 'not 0'.
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
---
arch/x86/kernel/umip.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/umip.c b/arch/x86/kernel/umip.c
index 3ce99cbcf187..dfff28ea1dea 100644
--- a/arch/x86/kernel/umip.c
+++ b/arch/x86/kernel/umip.c
@@ -409,7 +409,7 @@ bool fixup_umip_exception(struct pt_regs *regs)
return false;
nr_copied = copy_to_user(uaddr, dummy_data, dummy_data_size);
- if (nr_copied > 0) {
+ if (nr_copied) {
/*
* If copy fails, send a signal and tell caller that
* fault was fixed up.
--
2.49.0
next prev parent reply other threads:[~2026-04-27 17:17 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 17:13 [RFC PATCH v1 0/9] uaccess: Convert small fixed size copy_{to/from}_user() to scoped user access Christophe Leroy (CS GROUP)
2026-04-27 17:13 ` [RFC PATCH v1 1/9] uaccess: Split check_zeroed_user() out of usercopy.c Christophe Leroy (CS GROUP)
2026-04-27 17:13 ` [RFC PATCH v1 2/9] uaccess: Convert INLINE_COPY_{TO/FROM}_USER to kconfig and reduce ifdefery Christophe Leroy (CS GROUP)
2026-04-27 18:39 ` Yury Norov
2026-04-27 20:39 ` Andrew Cooper
2026-04-27 20:47 ` Yury Norov
2026-04-28 9:36 ` Andrew Cooper
2026-04-28 11:34 ` Segher Boessenkool
2026-04-27 17:13 ` Christophe Leroy (CS GROUP) [this message]
2026-04-27 17:13 ` [RFC PATCH v1 4/9] uaccess: Introduce copy_{to/from}_user_partial() Christophe Leroy (CS GROUP)
2026-04-28 9:25 ` Geert Uytterhoeven
2026-04-27 17:13 ` [RFC PATCH v1 5/9] uaccess: Switch to copy_{to/from}_user_partial() when relevant Christophe Leroy (CS GROUP)
2026-04-27 18:07 ` Alice Ryhl
2026-04-27 19:01 ` Linus Torvalds
2026-04-27 21:29 ` David Laight
2026-04-27 21:39 ` Linus Torvalds
2026-04-27 17:13 ` [RFC PATCH v1 6/9] uaccess: Change copy_{to/from}_user to return -EFAULT Christophe Leroy (CS GROUP)
2026-04-27 17:13 ` [RFC PATCH v1 7/9] x86: Add unsafe_copy_from_user() Christophe Leroy (CS GROUP)
2026-04-27 17:58 ` Yury Norov
2026-04-27 18:20 ` Christophe Leroy (CS GROUP)
2026-04-27 19:19 ` Yury Norov
2026-04-27 21:52 ` Linus Torvalds
2026-04-27 22:30 ` Yury Norov
2026-04-28 11:20 ` Segher Boessenkool
2026-04-29 10:25 ` Usama Arif
2026-04-27 17:13 ` [RFC PATCH v1 8/9] arm64: " Christophe Leroy (CS GROUP)
2026-04-29 11:26 ` Will Deacon
2026-04-27 17:13 ` [RFC PATCH v1 9/9] uaccess: Convert small fixed size copy_{to/from}_user() to scoped user access Christophe Leroy (CS GROUP)
2026-04-27 20:12 ` Yury Norov
2026-04-27 19:01 ` [RFC PATCH v1 0/9] " Helge Deller
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