From: "tip-bot2 for Arnd Bergmann" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>, Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Martin Sebor <msebor@gmail.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/boot] x86/boot/compressed: Avoid gcc-11 -Wstringop-overread warning
Date: Mon, 22 Mar 2021 23:30:23 -0000 [thread overview]
Message-ID: <161645582353.398.15659537089500067394.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210322160253.4032422-2-arnd@kernel.org>
The following commit has been merged into the x86/boot branch of tip:
Commit-ID: e14cfb3bdd0f82147d09e9f46bedda6302f28ee1
Gitweb: https://git.kernel.org/tip/e14cfb3bdd0f82147d09e9f46bedda6302f28ee1
Author: Arnd Bergmann <arnd@arndb.de>
AuthorDate: Mon, 22 Mar 2021 17:02:39 +01:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 23 Mar 2021 00:16:25 +01:00
x86/boot/compressed: Avoid gcc-11 -Wstringop-overread warning
GCC gets confused by the comparison of a pointer to an integer literal,
with the assumption that this is an offset from a NULL pointer and that
dereferencing it is invalid:
In file included from arch/x86/boot/compressed/misc.c:18:
In function ‘parse_elf’,
inlined from ‘extract_kernel’ at arch/x86/boot/compressed/misc.c:442:2:
arch/x86/boot/compressed/../string.h:15:23: error: ‘__builtin_memcpy’ reading 64 bytes from a region of size 0 [-Werror=stringop-overread]
15 | #define memcpy(d,s,l) __builtin_memcpy(d,s,l)
| ^~~~~~~~~~~~~~~~~~~~~~~
arch/x86/boot/compressed/misc.c:283:9: note: in expansion of macro ‘memcpy’
283 | memcpy(&ehdr, output, sizeof(ehdr));
| ^~~~~~
I could not find any good workaround for this, but as this is only
a warning for a failure during early boot, removing the line entirely
works around the warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Sebor <msebor@gmail.com>
Link: https://lore.kernel.org/r/20210322160253.4032422-2-arnd@kernel.org
---
arch/x86/boot/compressed/misc.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 267e7f9..1945b8a 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -430,8 +430,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
error("Destination address too large");
#endif
#ifndef CONFIG_RELOCATABLE
- if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
- error("Destination address does not match LOAD_PHYSICAL_ADDR");
if (virt_addr != LOAD_PHYSICAL_ADDR)
error("Destination virtual address changed when not relocatable");
#endif
next prev parent reply other threads:[~2021-03-22 23:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 16:02 [PATCH 00/11] treewide: address gcc-11 -Wstringop-overread warnings Arnd Bergmann
2021-03-22 16:02 ` [PATCH 01/11] x86: compressed: avoid gcc-11 -Wstringop-overread warning Arnd Bergmann
2021-03-22 23:30 ` tip-bot2 for Arnd Bergmann [this message]
2021-03-22 16:02 ` [PATCH 02/11] x86: tboot: avoid Wstringop-overread-warning Arnd Bergmann
2021-03-22 20:29 ` Ingo Molnar
2021-03-22 21:39 ` Arnd Bergmann
2021-03-22 22:07 ` Martin Sebor
2021-03-22 22:49 ` Arnd Bergmann
2021-03-22 23:13 ` Ingo Molnar
2021-03-24 9:11 ` David Laight
2021-03-24 10:39 ` David Laight
2021-03-22 23:30 ` [tip: x86/boot] x86/boot/tboot: Avoid Wstringop-overread-warning tip-bot2 for Arnd Bergmann
2021-03-22 16:02 ` [PATCH 03/11] security: commoncap: fix -Wstringop-overread warning Arnd Bergmann
2021-03-22 16:31 ` Christian Brauner
2021-03-24 20:50 ` James Morris
2021-03-22 16:02 ` [PATCH 04/11] ath11: Wstringop-overread warning Arnd Bergmann
2021-09-28 9:04 ` Kalle Valo
2021-03-22 16:02 ` [PATCH 05/11] qnx: avoid -Wstringop-overread warning Arnd Bergmann
2021-03-22 16:02 ` [PATCH 06/11] cgroup: fix -Wzero-length-bounds warnings Arnd Bergmann
2021-03-30 8:41 ` Michal Koutný
2021-03-30 9:00 ` Arnd Bergmann
2021-03-30 14:44 ` Michal Koutný
2021-03-22 16:02 ` [PATCH 07/11] ARM: sharpsl_param: work around -Wstringop-overread warning Arnd Bergmann
2021-03-22 16:02 ` [PATCH 08/11] atmel: avoid gcc -Wstringop-overflow warning Arnd Bergmann
2021-03-22 16:02 ` [PATCH 09/11] scsi: lpfc: fix gcc -Wstringop-overread warning Arnd Bergmann
2021-03-22 16:02 ` [PATCH 10/11] drm/i915: avoid stringop-overread warning on pri_latency Arnd Bergmann
2021-03-24 15:30 ` Jani Nikula
2021-03-24 17:22 ` Ville Syrjälä
2021-03-22 16:02 ` [PATCH 11/11] [RFC] drm/i915/dp: fix array overflow warning Arnd Bergmann
2021-03-25 8:05 ` Jani Nikula
2021-03-25 9:53 ` Arnd Bergmann
2021-03-25 14:49 ` Martin Sebor
2021-03-30 10:56 ` Hans de Goede
2021-04-06 4:53 ` [PATCH 00/11] treewide: address gcc-11 -Wstringop-overread warnings Martin K. Petersen
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