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kernel: backport fix undefined abort

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While building mpi.ko module with stable Linux v4.14.14 an error occured:
>ERROR: "abort" [lib/mpi/mpi.ko] undefined!
In upstream Linux 4.15 this issue is fixed:
Commit 7c2c11b208be ("arch: define weak abort()")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c2c11b208be09c156573fc0076b7b3646e05219

Commit dc8635b78cd8 ("kernel/exit.c: export abort() to modules")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dc8635b78cd8669c37e230058d18c33af7451ab1

So lets add backport patches until these fixes
are not applied in stable version.

Signed-off-by: Evgeniy Didin <Evgeniy.Didin@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
CC: John Crispin <john@phrozen.org>
CC: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Evgeniy Didin 2018-01-30 15:36:51 +03:00 committed by Hauke Mehrtens
parent 7c5960ddc4
commit b38758d4d4
2 changed files with 125 additions and 0 deletions
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51
target/linux/generic/backport-4.14/080-v4.15-0001-arch-define-weak-abort.patch Normal file
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@ -0,0 +1,51 @@
From 7c2c11b208be09c156573fc0076b7b3646e05219 Mon Sep 17 00:00:00 2001
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Date: Thu, 14 Dec 2017 15:33:19 -0800
Subject: [PATCH] arch: define weak abort()
gcc toggle -fisolate-erroneous-paths-dereference (default at -O2
onwards) isolates faulty code paths such as null pointer access, divide
by zero etc. If gcc port doesnt implement __builtin_trap, an abort() is
generated which causes kernel link error.
In this case, gcc is generating abort due to 'divide by zero' in
lib/mpi/mpih-div.c.
Currently 'frv' and 'arc' are failing. Previously other arch was also
broken like m32r was fixed by commit d22e3d69ee1a ("m32r: fix build
failure").
Let's define this weak function which is common for all arch and fix the
problem permanently. We can even remove the arch specific 'abort' after
this is done.
Link: http://lkml.kernel.org/r/1513118956-8718-1-git-send-email-sudipm.mukherjee@gmail.com
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/exit.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/exit.c b/kernel/exit.c
index 6b4298a41167..df0c91d5606c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1755,3 +1755,11 @@ COMPAT_SYSCALL_DEFINE5(waitid,
return -EFAULT;
}
#endif
+
+__weak void abort(void)
+{
+ BUG();
+
+ /* if that doesn't kill us, halt */
+ panic("Oops failed to kill thread");
+}
--
2.11.0

74
target/linux/generic/backport-4.14/081-v4.15-0002-kernel-exit.c-export-abort-to-modules.patch Normal file
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@ -0,0 +1,74 @@
From dc8635b78cd8669c37e230058d18c33af7451ab1 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 4 Jan 2018 16:17:56 -0800
Subject: [PATCH] kernel/exit.c: export abort() to modules
gcc -fisolate-erroneous-paths-dereference can generate calls to abort()
from modular code too.
[arnd@arndb.de: drop duplicate exports of abort()]
Link: http://lkml.kernel.org/r/20180102103311.706364-1-arnd@arndb.de
Reported-by: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/arm/kernel/traps.c | 1 -
arch/m32r/kernel/traps.c | 1 -
arch/unicore32/kernel/traps.c | 1 -
kernel/exit.c | 1 +
4 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 5cf04888c581..3e26c6f7a191 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -793,7 +793,6 @@ void abort(void)
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}
-EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
diff --git a/arch/m32r/kernel/traps.c b/arch/m32r/kernel/traps.c
index cb79fba79d43..b88a8dd14933 100644
--- a/arch/m32r/kernel/traps.c
+++ b/arch/m32r/kernel/traps.c
@@ -122,7 +122,6 @@ void abort(void)
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}
-EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
diff --git a/arch/unicore32/kernel/traps.c b/arch/unicore32/kernel/traps.c
index 5f25b39f04d4..c4ac6043ebb0 100644
--- a/arch/unicore32/kernel/traps.c
+++ b/arch/unicore32/kernel/traps.c
@@ -298,7 +298,6 @@ void abort(void)
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}
-EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
diff --git a/kernel/exit.c b/kernel/exit.c
index df0c91d5606c..995453d9fb55 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1763,3 +1763,4 @@ __weak void abort(void)
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}
+EXPORT_SYMBOL(abort);
--
2.11.0