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https://github.com/dynup/kpatch
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fed5786932
Rebased to kernel-4.18.0-304.el8.
Note: since RHEL-8.4 dropped klp.arch support, we can now re-enable
those tests that reference static keys defined in vmlinux.
Also, adjust for adjust for ppc64le inlining:
Building gcc-static-local-var-4.patch on ppc64le results in test
failure, as the kpatch .ko now contains a 'free_ioctx' symbol (the test
expects to NOT see one).
From the build log:
aio.o: changed function: free_ioctx
aio.o: new function: put_aio_ring_file << now un-inlined?
aio.o: changed function: aio_free_ring
aio.o: changed function: ioctx_alloc
aio.o: changed function: aio_prep_rw
aio.o: changed function: aio_read_events
aio.o: new function: kpatch_aio_foo << expected new function
and a source code change to free_ioctx():
% diff -upr \
<(objdump -D -j .text.free_ioctx ~/.kpatch/tmp/orig/fs/aio.o) \
<(objdump -D -j .text.free_ioctx ~/.kpatch/tmp/patched/fs/aio.o)
--- /dev/fd/63 2020-10-26 14:28:18.086236019 -0400
+++ /dev/fd/62 2020-10-26 14:28:18.086236019 -0400
@@ -1,5 +1,5 @@
-/root/.kpatch/tmp/orig/fs/aio.o: file format elf64-powerpcle
+/root/.kpatch/tmp/patched/fs/aio.o: file format elf64-powerpcle
Disassembly of section .text.free_ioctx:
@@ -53,7 +53,7 @@ Disassembly of section .text.free_ioctx:
b0: 00 00 82 3c addis r4,r2,0
b4: 00 00 84 e8 ld r4,0(r4)
b8: 78 fb e6 7f mr r6,r31
- bc: e0 00 63 38 addi r3,r3,224
+ bc: 38 00 63 38 addi r3,r3,56
c0: 01 00 00 48 bl c0 <free_ioctx+0xb8>
c4: 00 00 00 60 nop
c8: 70 ff ff 4b b 38 <free_ioctx+0x30>
Marking put_aio_ring_file() as __always_inline keeps the r3 / 224
offset value, leaving free_ioctx() unchanged. Since it's no longer
included in the resulting .ko, gcc-static-local-var-4.test will pass
once again.
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
14 lines
468 B
Diff
14 lines
468 B
Diff
diff -Nupr src.orig/mm/mmap.c src/mm/mmap.c
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--- src.orig/mm/mmap.c 2021-04-20 11:04:27.341102160 -0400
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+++ src/mm/mmap.c 2021-04-20 11:04:46.880151184 -0400
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@@ -1690,6 +1690,9 @@ unsigned long mmap_region(struct file *f
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struct rb_node **rb_link, *rb_parent;
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unsigned long charged = 0;
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+ if (!jiffies)
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+ printk("kpatch mmap foo\n");
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+
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/* Check against address space limit. */
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if (!may_expand_vm(mm, vm_flags, len >> PAGE_SHIFT)) {
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unsigned long nr_pages;
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