The patch titled
Subject: syscalls: use uaccess_kernel in addr_limit_user_check
has been removed from the -mm tree. Its filename was
syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: syscalls: use uaccess_kernel in addr_limit_user_check
Patch series "clean up address limit helpers", v2.
In preparation for eventually phasing out direct use of set_fs(), this
series removes the segment_eq() arch helper that is only used to implement
or duplicate the uaccess_kernel() API, and then adds descriptive helpers
to force the kernel address limit.
This patch (of 6):
Use the uaccess_kernel helper instead of duplicating it.
[hch@xxxxxx: arm: don't call addr_limit_user_check for nommu]
Link: http://lkml.kernel.org/r/20200721045834.GA9613@xxxxxx
Link: http://lkml.kernel.org/r/20200714105505.935079-1-hch@xxxxxx
Link: http://lkml.kernel.org/r/20200710135706.537715-1-hch@xxxxxx
Link: http://lkml.kernel.org/r/20200710135706.537715-2-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Nick Hu <nickhu@xxxxxxxxxxxxx>
Cc: Greentime Hu <green.hu@xxxxxxxxx>
Cc: Vincent Chen <deanbo422@xxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/signal.c | 2 ++
include/linux/syscalls.h | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/arch/arm/kernel/signal.c~syscalls-use-uaccess_kernel-in-addr_limit_user_check
+++ a/arch/arm/kernel/signal.c
@@ -713,7 +713,9 @@ struct page *get_signal_page(void)
/* Defer to generic check */
asmlinkage void addr_limit_check_failed(void)
{
+#ifdef CONFIG_MMU
addr_limit_user_check();
+#endif
}
#ifdef CONFIG_DEBUG_RSEQ
--- a/include/linux/syscalls.h~syscalls-use-uaccess_kernel-in-addr_limit_user_check
+++ a/include/linux/syscalls.h
@@ -263,7 +263,7 @@ static inline void addr_limit_user_check
return;
#endif
- if (CHECK_DATA_CORRUPTION(!segment_eq(get_fs(), USER_DS),
+ if (CHECK_DATA_CORRUPTION(uaccess_kernel(),
"Invalid address limit on user-mode return"))
force_sig(SIGKILL);
_
Patches currently in -mm which might be from hch@xxxxxx are
