Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to copy syz-execprog to VM: scp failed: failed to run ["scp" "-P" "15791" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "-O" "/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/bin/linux_amd64/syz-execprog" "root@localhost:/syz-execprog"]: exit status 1



syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build950368554=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 12a0a44a11e
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"12a0a44a11e4f0e07457f2b9d76763cd609f4f86\"
/usr/bin/ld: /tmp/ccxK4Fsx.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=150ddbf9580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com
Tested-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com

Tested on:

commit:         f6e7b42b Merge tag 'sysctl-7.03-fixes-rc4' of git://gi..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1481ebf9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=161658c9580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com
Tested-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com

Tested on:

commit:         f6e7b42b Merge tag 'sysctl-7.03-fixes-rc4' of git://gi..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=126eebf9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=177f93f9580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to copy syz-executor to VM: scp failed: failed to run ["scp" "-P" "7267" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-v" "-O" "/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/bin/linux_amd64/syz-executor" "root@localhost:/syz-executor"]: exit status 1



syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3200815817=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 12a0a44a11e
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"12a0a44a11e4f0e07457f2b9d76763cd609f4f86\"
/usr/bin/ld: /tmp/cclPQ5Yy.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1666ebf9580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[Edward Adam Davis]

From: Edward Aadm Davis <eadavis@sina.com>

#syz test: upstream f6e7b42bf05b

diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 51651314b7a6..a52ede408f1c 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -455,6 +455,9 @@ ecryptfs_verify_auth_tok_from_key(struct key *auth_tok_key,
 {
 	int rc = 0;
 
+	if (auth_tok_key->datalen < sizeof(**auth_tok))
+		return -EINVAL;
+
 	(*auth_tok) = ecryptfs_get_key_payload_data(auth_tok_key);
 	if (IS_ERR(*auth_tok)) {
 		rc = PTR_ERR(*auth_tok);

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
error: corrupt patch at line 14



Tested on:

commit:         238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11f6b925580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
error: corrupt patch at line 14



Tested on:

commit:         238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17d6b925580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
error: corrupt patch at line 4



Tested on:

commit:         238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=103258c9580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com
Tested-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com

Tested on:

commit:         f6e7b42b Merge tag 'sysctl-7.03-fixes-rc4' of git://gi..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=121793f9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=139b8915580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[Edward Adam Davis]

From: Edward Aadm Davis <eadavis@sina.com>

#syz test: upstream f6e7b42bf05b

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 6f88b507f927..6bf3e2da7bda 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -61,7 +61,8 @@ int user_preparse(struct key_preparsed_payload *prep)
 	struct user_key_payload *upayload;
 	size_t datalen = prep->datalen;
 
-	if (datalen == 0 || datalen > 32767 || !prep->data)
+	if (datalen == 0 || datalen > 32767 || datalen < 4 ||
+	    !prep->data)
 		return -EINVAL;
 
 	upayload = kmalloc_flex(*upayload, data, datalen);

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

lost connection to test machine



syzkaller login: qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x400000)
[   91.925486][   T10] cfg80211: failed to load regulatory.db
Warning: Permanently added '[localhost]:30539' (ED25519) to the list of known hosts.
2026/09/17 02:08:46 parsed 1 programs
2026/09/17 02:08:46 serving rpc on tcp://38533
[   96.572980][ T5287] cgroup: Unknown subsys name 'net'
[   96.624230][ T5287] cgroup: Unknown subsys name 'cpuset'
[   96.628137][ T5287] cgroup: Unknown subsys name 'rlimit'
[  117.530042][ T1024] ata1.00: exception Emask 0x0 SAct 0x4000 SErr 0x0 action 0x6 frozen
[  117.530070][ T1024] ata1.00: failed command: WRITE FPDMA QUEUED
[  117.530078][ T1024] ata1.00: cmd 61/00:70:36:81:04/20:00:00:00:00/40 tag 14 ncq dma 4194304 ou
[  117.530078][ T1024]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  117.530107][ T1024] ata1.00: status: { DRDY }
[  117.530148][ T1024] ata1: hard resetting link
[  117.854290][ T1024] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  117.855240][ T1024] ata1.00: configured for UDMA/100
[  117.855521][ T1024] ata1: EH complete
Setting up swapspace version 1, size = 127995904 bytes
[  119.296232][ T5287] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0xa8000)
[  121.760867][ T1024] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1
[  121.760887][ T1024] ata1: failed to read log page 10h (errno=-5)
[  121.760897][ T1024] ata1.00: NCQ disabled due to excessive errors
[  121.760905][ T1024] ata1.00: exception Emask 0x1 SAct 0xc000 SErr 0x0 action 0x0
[  121.760915][ T1024] ata1.00: irq_stat 0x41000000
[  121.760925][ T1024] ata1.00: failed command: READ FPDMA QUEUED
[  121.760932][ T1024] ata1.00: cmd 60/40:70:36:51:05/05:00:00:00:00/40 tag 14 ncq dma 688128 in
[  121.760932][ T1024]          res 50/04:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  121.760961][ T1024] ata1.00: status: { DRDY }
[  121.760968][ T1024] ata1.00: error: { ABRT }
[  121.760977][ T1024] ata1.00: failed command: READ FPDMA QUEUED
[  121.760983][ T1024] ata1.00: cmd 60/c0:78:76:56:05/02:00:00:00:00/40 tag 15 ncq dma 360448 in
[  121.760983][ T1024]          res 50/04:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  121.761010][ T1024] ata1.00: status: { DRDY }
[  121.761017][ T1024] ata1.00: error: { ABRT }
[  121.762668][ T1024] ata1.00: configured for UDMA/100
[  121.763094][ T1024] sd 0:0:0:0: [sda] tag#14 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
[  121.763126][ T1024] sd 0:0:0:0: [sda] tag#14 Sense Key : Aborted Command [current] 
[  121.763149][ T1024] sd 0:0:0:0: [sda] tag#14 Add. Sense: No additional sense information
[  121.763173][ T1024] sd 0:0:0:0: [sda] tag#14 CDB: Read(10) 28 00 00 05 51 36 00 05 40 00
[  121.763186][ T1024] I/O error, dev sda, sector 348470 op 0x0:(READ) flags 0x84700 phys_seg 168 prio class 2
[  121.763396][ T1024] sd 0:0:0:0: [sda] tag#15 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
[  121.763421][ T1024] sd 0:0:0:0: [sda] tag#15 Sense Key : Aborted Command [current] 
[  121.763442][ T1024] sd 0:0:0:0: [sda] tag#15 Add. Sense: No additional sense information
[  121.763464][ T1024] sd 0:0:0:0: [sda] tag#15 CDB: Read(10) 28 00 00 05 56 76 00 02 c0 00
[  121.763475][ T1024] I/O error, dev sda, sector 349814 op 0x0:(READ) flags 0x84700 phys_seg 88 prio class 2
[  121.763614][ T1024] ata1: EH complete
[  124.582483][ T5311] soft_limit_in_bytes is deprecated and will be removed. Writing any value to this file has no effect. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
qemu-system-x86_64: hw/ide/core.c:925: ide_dma_cb: Assertion `prep_size >= 0 && prep_size <= n * 512' failed.
Connection to localhost closed by remote host.


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1383433036=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 12a0a44a11e
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=12a0a44a11e4f0e07457f2b9d76763cd609f4f86 -X github.com/google/syzkaller/prog.gitRevisionDate=20260915-150835"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"12a0a44a11e4f0e07457f2b9d76763cd609f4f86\"
go: downloading google.golang.org/grpc v1.83.2
go: downloading golang.org/x/crypto v0.55.0
go: downloading golang.org/x/net v0.58.0
go: downloading golang.org/x/text v0.41.0
/usr/bin/ld: /tmp/ccn9ay4F.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         f6e7b42b Merge tag 'sysctl-7.03-fixes-rc4' of git://gi..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14cb93f9580000

Re: [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[Edward Adam Davis]

From: Edward Aadm Davis <eadavis@sina.com>

#syz test: upstream f6e7b42bf05b

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 6f88b507f927..6bf3e2da7bda 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -61,7 +61,8 @@ int user_preparse(struct key_preparsed_payload *prep)
 	struct user_key_payload *upayload;
 	size_t datalen = prep->datalen;
 
-	if (datalen == 0 || datalen > 32767 || !prep->data)
+	if (datalen == 0 || datalen > 32767 || datalen < sizeof(*upayload) ||
+	    !prep->data)
 		return -EINVAL;
 
 	upayload = kmalloc_flex(*upayload, data, datalen);

[syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_verify_auth_tok_from_key

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    f6e7b42bf05b Merge tag 'sysctl-7.03-fixes-rc4' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=148603f9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e909ffe6b35dddb7
dashboard link: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=119813f9580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=174acdf9580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f6e7b42b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/93106cf47a8e/vmlinux-f6e7b42b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e73f0f00e455/bzImage-f6e7b42b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/55bc8f3c0251/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=108603f9580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com

XFS (loop0): Ending clean mount
XFS (loop0): Quotacheck needed: Please wait.
XFS (loop0): Quotacheck: Done.
==================================================================
BUG: KASAN: slab-out-of-bounds in ecryptfs_verify_auth_tok_from_key+0x38f/0x3a0 fs/ecryptfs/keystore.c:473
Read of size 2 at addr ffff88803ae2a71b by task syz.0.17/5484

CPU: 0 UID: 0 PID: 5484 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ecryptfs_verify_auth_tok_from_key+0x38f/0x3a0 fs/ecryptfs/keystore.c:473
 ecryptfs_keyring_auth_tok_for_sig+0xec/0x250 fs/ecryptfs/keystore.c:1606
 ecryptfs_init_global_auth_toks fs/ecryptfs/main.c:194 [inline]
 ecryptfs_validate_options fs/ecryptfs/main.c:420 [inline]
 ecryptfs_get_tree+0x563/0x1370 fs/ecryptfs/main.c:453
 vfs_get_tree+0x92/0x2a0 fs/super.c:1933
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount+0x319/0xdc0 fs/namespace.c:3848
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4374
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f355439e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f35552a4028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3554625fa0 RCX: 00007f355439e159
RDX: 0000200000000480 RSI: 0000200000000440 RDI: 0000200000000400
RBP: 00007f355443506b R08: 0000200000000500 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3554626038 R14: 00007f3554625fa0 R15: 00007ffd4f4b3c68
 </TASK>

Allocated by task 5484:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kmalloc_noprof+0x36b/0x720 mm/slub.c:5439
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 user_preparse+0x9e/0x160 security/keys/user_defined.c:67
 __key_create_or_update+0x3a9/0xa80 security/keys/key.c:857
 key_create_or_update+0x42/0x60 security/keys/key.c:1021
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x349/0x420 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88803ae2a700
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 allocated 27-byte region [ffff88803ae2a700, ffff88803ae2a71b)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3ae2a
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801b041780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5056, tgid 5056 (rm), ts 60539039982
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7417
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 slab_free_hook mm/slub.c:2700 [inline]
 slab_free mm/slub.c:6508 [inline]
 kmem_cache_free+0x156/0x650 mm/slub.c:6635
 tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
 exit_mmap+0x4ca/0x9f0 mm/mmap.c:1335
 __mmput+0x118/0x420 kernel/fork.c:1193
 exec_mm_put_old fs/exec.c:919 [inline]
 setup_new_exec+0x30d/0x360 fs/exec.c:1386
 load_elf_binary+0xbc0/0x28d0 fs/binfmt_elf.c:1024
 search_binary_handler fs/exec.c:1765 [inline]
 exec_binprm fs/exec.c:1797 [inline]
 bprm_execve+0x930/0x1590 fs/exec.c:1853
 do_execveat_common+0x4f4/0x670 fs/exec.c:1951
 __do_sys_execve fs/exec.c:2024 [inline]
 __se_sys_execve fs/exec.c:2018 [inline]
 __x64_sys_execve+0x97/0xc0 fs/exec.c:2018
page last free pid 5056 tgid 5056 ts 60538565273 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 tlb_batch_list_free mm/mmu_gather.c:161 [inline]
 tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:552
 exit_mmap+0x4b2/0x9f0 mm/mmap.c:1328
 __mmput+0x118/0x420 kernel/fork.c:1193
 exec_mm_put_old fs/exec.c:919 [inline]
 setup_new_exec+0x30d/0x360 fs/exec.c:1386
 load_elf_binary+0xbc0/0x28d0 fs/binfmt_elf.c:1024
 search_binary_handler fs/exec.c:1765 [inline]
 exec_binprm fs/exec.c:1797 [inline]
 bprm_execve+0x930/0x1590 fs/exec.c:1853
 do_execveat_common+0x4f4/0x670 fs/exec.c:1951
 __do_sys_execve fs/exec.c:2024 [inline]
 __se_sys_execve fs/exec.c:2018 [inline]
 __x64_sys_execve+0x97/0xc0 fs/exec.c:2018
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88803ae2a600: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff88803ae2a680: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88803ae2a700: 00 00 00 03 fc fc fc fc fa fb fb fb fc fc fc fc
                            ^
 ffff88803ae2a780: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff88803ae2a800: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup