6.6-stable patches

added patches:
	s390-entry-fix-last-breaking-event-handling-in-case-of-stack-corruption.patch

diff --git a/queue-6.6/s390-entry-fix-last-breaking-event-handling-in-case-of-stack-corruption.patch b/queue-6.6/s390-entry-fix-last-breaking-event-handling-in-case-of-stack-corruption.patch
new file mode 100644 (file)
index 0000000..ac28fbf
--- /dev/null
+++ b/queue-6.6/s390-entry-fix-last-breaking-event-handling-in-case-of-stack-corruption.patch
@@ -0,0 +1,37 @@
+From ae952eea6f4a7e2193f8721a5366049946e012e7 Mon Sep 17 00:00:00 2001
+From: Heiko Carstens <hca@linux.ibm.com>
+Date: Thu, 24 Apr 2025 17:07:01 +0200
+Subject: s390/entry: Fix last breaking event handling in case of stack corruption
+
+From: Heiko Carstens <hca@linux.ibm.com>
+
+commit ae952eea6f4a7e2193f8721a5366049946e012e7 upstream.
+
+In case of stack corruption stack_invalid() is called and the expectation
+is that register r10 contains the last breaking event address. This
+dependency is quite subtle and broke a couple of years ago without that
+anybody noticed.
+
+Fix this by getting rid of the dependency and read the last breaking event
+address from lowcore.
+
+Fixes: 56e62a737028 ("s390: convert to generic entry")
+Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
+Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
+Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/s390/kernel/entry.S |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/s390/kernel/entry.S
++++ b/arch/s390/kernel/entry.S
+@@ -639,7 +639,7 @@ SYM_CODE_START(stack_overflow)
+       stmg    %r0,%r7,__PT_R0(%r11)
+       stmg    %r8,%r9,__PT_PSW(%r11)
+       mvc     __PT_R8(64,%r11),0(%r14)
+-      stg     %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2
++      mvc     __PT_ORIG_GPR2(8,%r11),__LC_PGM_LAST_BREAK
+       xc      __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
+       lgr     %r2,%r11                # pass pointer to pt_regs
+       jg      kernel_stack_overflow

diff --git a/queue-6.6/series b/queue-6.6/series
index d5fb9fb1612dc1511c7081ff53d782dbb195c234..5d1e3de795e3c558482446651ad4354ef93daa1a 100644 (file)
--- a/queue-6.6/series
+++ b/queue-6.6/series
@@ -139,3 +139,4 @@ ksmbd-remove-unsafe_memcpy-use-in-session-setup.patch
 scripts-clean-up-ia-64-code.patch
 kbuild-rpm-pkg-simplify-installkernel-post.patch
 media-uvcvideo-rollback-non-processed-entities-on-error.patch
+s390-entry-fix-last-breaking-event-handling-in-case-of-stack-corruption.patch