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-rw-r--r--.SRCINFO4
-rw-r--r--PKGBUILD4
-rw-r--r--bcache_fix.patch129
3 files changed, 135 insertions, 2 deletions
diff --git a/.SRCINFO b/.SRCINFO
index ff0b585ae39..7a88c1a363f 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,6 +1,6 @@
pkgbase = linux-rt-lts
pkgver = 4.19.50_rt22
- pkgrel = 1
+ pkgrel = 2
url = https://git.archlinux.org/linux.git/log/?h=v
arch = x86_64
license = GPL2
@@ -16,6 +16,7 @@ pkgbase = linux-rt-lts
source = https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patch-4.19.50-rt22.patch.xz
source = https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patch-4.19.50-rt22.patch.sign
source = 0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
+ source = bcache_fix.patch
source = config
source = 60-linux-rt-lts.hook
source = 90-linux-rt-lts.hook
@@ -31,6 +32,7 @@ pkgbase = linux-rt-lts
sha256sums = fc842d2e108cd4f21c168de3e3e75f41e43e519dd4dffbc3230bed67e9d24b89
sha256sums = SKIP
sha256sums = 75aa8dd708ca5a0137fbf7cddc9cafefe6aac6b8e0638c06c156d412d05af4bc
+ sha256sums = fe00e6f26f167b2041f4e60588cc60ab8169f26efb4a7c47ee7d60320e4ca27d
sha256sums = 203221ce5e835e55f87585340ca7e50b3a8eefbb58161570479a1cf88963e2b7
sha256sums = ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21
sha256sums = 75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919
diff --git a/PKGBUILD b/PKGBUILD
index 0c07dc7e14a..406f2552126 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -11,7 +11,7 @@ pkgbase=linux-rt-lts # Build kernel with a different name
_pkgver=4.19.50
_rtpatchver=rt22
pkgver=${_pkgver}_${_rtpatchver}
-pkgrel=1
+pkgrel=2
arch=('x86_64')
url="https://git.archlinux.org/linux.git/log/?h=v$_srcver"
license=('GPL2')
@@ -24,6 +24,7 @@ source=(
"https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patch-${_pkgver}-${_rtpatchver}.patch.xz"
"https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patch-${_pkgver}-${_rtpatchver}.patch.sign"
0001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by.patch
+ bcache_fix.patch
config # the main kernel config file
60-${pkgbase}.hook # pacman hook for depmod
90-${pkgbase}.hook # pacman hook for initramfs regeneration
@@ -42,6 +43,7 @@ sha256sums=('a9987423918abd20ee68d6e9b14b7225eaca8a586bf75fb56c49f6e1e47ce01e'
'fc842d2e108cd4f21c168de3e3e75f41e43e519dd4dffbc3230bed67e9d24b89'
'SKIP'
'75aa8dd708ca5a0137fbf7cddc9cafefe6aac6b8e0638c06c156d412d05af4bc'
+ 'fe00e6f26f167b2041f4e60588cc60ab8169f26efb4a7c47ee7d60320e4ca27d'
'203221ce5e835e55f87585340ca7e50b3a8eefbb58161570479a1cf88963e2b7'
'ae2e95db94ef7176207c690224169594d49445e04249d2499e9d2fbc117a0b21'
'75f99f5239e03238f88d1a834c50043ec32b1dc568f2cc291b07d04718483919'
diff --git a/bcache_fix.patch b/bcache_fix.patch
new file mode 100644
index 00000000000..f5c94a5bc84
--- /dev/null
+++ b/bcache_fix.patch
@@ -0,0 +1,129 @@
+From 9e50f5f4ef401c4a5cd286ee3218fcc625ef6f77 Mon Sep 17 00:00:00 2001
+From: Coly Li <colyli@suse.de>
+Date: Mon, 10 Jun 2019 06:13:34 +0800
+Subject: bcache: fix stack corruption by PRECEDING_KEY()
+
+Recently people report bcache code compiled with gcc9 is broken, one of
+the buggy behavior I observe is that two adjacent 4KB I/Os should merge
+into one but they don't. Finally it turns out to be a stack corruption
+caused by macro PRECEDING_KEY().
+
+See how PRECEDING_KEY() is defined in bset.h,
+437 #define PRECEDING_KEY(_k) \
+438 ({ \
+439 struct bkey *_ret = NULL; \
+440 \
+441 if (KEY_INODE(_k) || KEY_OFFSET(_k)) { \
+442 _ret = &KEY(KEY_INODE(_k), KEY_OFFSET(_k), 0); \
+443 \
+444 if (!_ret->low) \
+445 _ret->high--; \
+446 _ret->low--; \
+447 } \
+448 \
+449 _ret; \
+450 })
+
+At line 442, _ret points to address of a on-stack variable combined by
+KEY(), the life range of this on-stack variable is in line 442-446,
+once _ret is returned to bch_btree_insert_key(), the returned address
+points to an invalid stack address and this address is overwritten in
+the following called bch_btree_iter_init(). Then argument 'search' of
+bch_btree_iter_init() points to some address inside stackframe of
+bch_btree_iter_init(), exact address depends on how the compiler
+allocates stack space. Now the stack is corrupted.
+
+Fixes: 0eacac22034c ("bcache: PRECEDING_KEY()")
+Signed-off-by: Coly Li <colyli@suse.de>
+Reviewed-by: Rolf Fokkens <rolf@rolffokkens.nl>
+Reviewed-by: Pierre JUHEN <pierre.juhen@orange.fr>
+Tested-by: Shenghui Wang <shhuiw@foxmail.com>
+Tested-by: Pierre JUHEN <pierre.juhen@orange.fr>
+Cc: Kent Overstreet <kent.overstreet@gmail.com>
+Cc: Nix <nix@esperi.org.uk>
+Cc: stable@vger.kernel.org
+Signed-off-by: Jens Axboe <axboe@kernel.dk>
+---
+ drivers/md/bcache/bset.c | 16 +++++++++++++---
+ drivers/md/bcache/bset.h | 34 ++++++++++++++++++++--------------
+ 2 files changed, 33 insertions(+), 17 deletions(-)
+
+diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
+index 8f07fa6e1739..268f1b685084 100644
+--- a/drivers/md/bcache/bset.c
++++ b/drivers/md/bcache/bset.c
+@@ -887,12 +887,22 @@ unsigned int bch_btree_insert_key(struct btree_keys *b, struct bkey *k,
+ struct bset *i = bset_tree_last(b)->data;
+ struct bkey *m, *prev = NULL;
+ struct btree_iter iter;
++ struct bkey preceding_key_on_stack = ZERO_KEY;
++ struct bkey *preceding_key_p = &preceding_key_on_stack;
+
+ BUG_ON(b->ops->is_extents && !KEY_SIZE(k));
+
+- m = bch_btree_iter_init(b, &iter, b->ops->is_extents
+- ? PRECEDING_KEY(&START_KEY(k))
+- : PRECEDING_KEY(k));
++ /*
++ * If k has preceding key, preceding_key_p will be set to address
++ * of k's preceding key; otherwise preceding_key_p will be set
++ * to NULL inside preceding_key().
++ */
++ if (b->ops->is_extents)
++ preceding_key(&START_KEY(k), &preceding_key_p);
++ else
++ preceding_key(k, &preceding_key_p);
++
++ m = bch_btree_iter_init(b, &iter, preceding_key_p);
+
+ if (b->ops->insert_fixup(b, k, &iter, replace_key))
+ return status;
+diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h
+index bac76aabca6d..c71365e7c1fa 100644
+--- a/drivers/md/bcache/bset.h
++++ b/drivers/md/bcache/bset.h
+@@ -434,20 +434,26 @@ static inline bool bch_cut_back(const struct bkey *where, struct bkey *k)
+ return __bch_cut_back(where, k);
+ }
+
+-#define PRECEDING_KEY(_k) \
+-({ \
+- struct bkey *_ret = NULL; \
+- \
+- if (KEY_INODE(_k) || KEY_OFFSET(_k)) { \
+- _ret = &KEY(KEY_INODE(_k), KEY_OFFSET(_k), 0); \
+- \
+- if (!_ret->low) \
+- _ret->high--; \
+- _ret->low--; \
+- } \
+- \
+- _ret; \
+-})
++/*
++ * Pointer '*preceding_key_p' points to a memory object to store preceding
++ * key of k. If the preceding key does not exist, set '*preceding_key_p' to
++ * NULL. So the caller of preceding_key() needs to take care of memory
++ * which '*preceding_key_p' pointed to before calling preceding_key().
++ * Currently the only caller of preceding_key() is bch_btree_insert_key(),
++ * and it points to an on-stack variable, so the memory release is handled
++ * by stackframe itself.
++ */
++static inline void preceding_key(struct bkey *k, struct bkey **preceding_key_p)
++{
++ if (KEY_INODE(k) || KEY_OFFSET(k)) {
++ (**preceding_key_p) = KEY(KEY_INODE(k), KEY_OFFSET(k), 0);
++ if (!(*preceding_key_p)->low)
++ (*preceding_key_p)->high--;
++ (*preceding_key_p)->low--;
++ } else {
++ (*preceding_key_p) = NULL;
++ }
++}
+
+ static inline bool bch_ptr_invalid(struct btree_keys *b, const struct bkey *k)
+ {
+--
+cgit v1.2.1-1-g437b
+
+