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f55bd479d8
linux/arch/s390/kernel
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Thomas Richter f55bd479d8 s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex 
Reservation of the PMU hardware is done at first event creation
and is protected by a pair of mutex_lock() and mutex_unlock().
After reservation of the PMU hardware the memory
required for the PMUs the event is to be installed on is
allocated by allocate_buffers() and alloc_sampling_buffer().
This done outside of the mutex protection.
Without mutex protection two or more concurrent invocations of
perf_event_init() may run in parallel.
This can lead to allocation of Sample Data Blocks (SDBs)
multiple times for the same PMU.
Prevent this and protect memory allocation of SDBs by
mutex.

Fixes: 8a6fe8f21e ("s390/cpum_sf: Use refcount_t instead of atomic_t")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2024-10-31 10:50:06 +01:00
..
syscalls syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-06-25 15:57:20 +02:00
vdso32 more s390 updates for 6.10 merge window 2024-05-21 12:09:36 -07:00
vdso64 s390/vdso: Use one large alternative instead of an alternative branch 2024-09-23 17:57:04 +02:00
.gitignore
abs_lowcore.c s390: Add infrastructure to patch lowcore accesses 2024-07-23 16:02:32 +02:00
alternative.c s390: Add infrastructure to patch lowcore accesses 2024-07-23 16:02:32 +02:00
asm-offsets.c s390: Remove gmap pointer from lowcore 2024-10-29 11:49:19 +01:00
audit.c
audit.h
cache.c s390/cache: prevent rebuild of shared_cpu_list 2024-03-07 14:41:15 +01:00
cert_store.c fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
compat_audit.c
compat_linux.c
compat_linux.h
compat_ptrace.h
compat_signal.c s390/vdso: Move vdso symbol handling to separate header file 2024-09-13 17:28:36 +02:00
cpacf.c s390/crypto: Display Query and Query Authentication Information in sysfs 2024-09-12 14:13:27 +02:00
cpcmd.c s390: include linux/io.h instead of asm/io.h 2023-07-03 11:19:40 +02:00
cpufeature.c
crash_dump.c s390/kdump: Provide is_kdump_kernel() implementation 2024-10-25 16:03:23 +02:00
ctlreg.c s390/ctlreg: add system_ctl_load() 2023-09-19 13:26:57 +02:00
debug.c s390: Fix various typos 2024-10-25 16:03:23 +02:00
diag.c s390/wti: Introduce infrastructure for warning track interrupt 2024-08-29 22:56:34 +02:00
dis.c s390/disassembler: Remove duplicate instruction format RSY_RDRU 2024-09-12 14:13:27 +02:00
dumpstack.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
early_printk.c s390/early: Dump register contents and call trace for early crashes 2024-08-22 19:28:11 +02:00
early.c s390/setup: Recognize sequential instruction fetching facility 2024-08-29 22:56:34 +02:00
ebcdic.c s390/ebcdic: fix typo in comment 2023-07-27 13:11:35 +02:00
entry.h s390/switch_to: use generic header file 2024-02-12 15:03:33 +01:00
entry.S s390/mm/fault: Handle guest-related program interrupts in KVM 2024-10-29 11:49:18 +01:00
facility.c KVM: s390: vsie: Fix length of facility list shadowed 2023-12-23 10:41:09 +01:00
fpu.c s390/fpu: Re-add exception handling in load_fpu_state() 2024-07-31 16:30:20 +02:00
ftrace.c s390/ftrace: Avoid extra serialization for graph caller patching 2024-08-29 22:56:34 +02:00
ftrace.h s390/ftrace: Remove unused ftrace_plt_template* 2024-08-27 20:16:48 +02:00
guarded_storage.c s390: use control register bit defines 2023-09-19 13:26:57 +02:00
head64.S s390/head64: Make startup code ready for lowcore relocation 2024-07-23 16:02:32 +02:00
hiperdispatch.c s390/hiperdispatch: Add hiperdispatch debug counters 2024-08-29 22:56:35 +02:00
idle.c s390/idle: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
ima_arch.c
ipl_vmparm.c
ipl.c s390/ipl: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
irq.c s390/wti: Introduce infrastructure for warning track interrupt 2024-08-29 22:56:34 +02:00
jump_label.c
kdebugfs.c
kexec_elf.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kexec_image.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
kprobes.c s390/kprobes: Avoid stop machine if possible 2024-08-29 22:56:34 +02:00
lgr.c
machine_kexec_file.c s390, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
machine_kexec_reloc.c
machine_kexec.c s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
Makefile s390/crypto: Display Query and Query Authentication Information in sysfs 2024-09-12 14:13:27 +02:00
mcount.S s390: Use MARCH_HAS_*_FEATURES defines 2024-09-07 17:12:42 +02:00
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
nmi.c s390/nmi: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
nospec-branch.c s390/nospec: Push down alternative handling 2024-07-23 16:02:31 +02:00
nospec-sysfs.c s390/nospec: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
numa.c arch, mm: move definition of node_data to generic code 2024-09-03 21:15:28 -07:00
os_info.c s390: Fix various typos 2024-10-25 16:03:23 +02:00
perf_cpum_cf_events.c s390/cpum_cf: make crypto counters upward compatible across machine types 2024-04-09 17:29:56 +02:00
perf_cpum_cf.c s390: Fix various typos 2024-10-25 16:03:23 +02:00
perf_cpum_sf.c s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex 2024-10-31 10:50:06 +01:00
perf_event.c s390/perf_event: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
perf_pai_crypto.c s390/pai_crypto: Add support for MSA 10 and 11 pai counters 2024-09-05 15:17:23 +02:00
perf_pai_ext.c s390/pai_ext: Update PAI extension 1 counters 2024-09-05 15:17:23 +02:00
perf_regs.c s390/fpu: remove anonymous union from struct fpu 2024-02-16 14:30:16 +01:00
process.c s390: Replace S390_lowcore by get_lowcore() 2024-06-18 17:01:33 +02:00
processor.c s390/alternatives: Move text sync functions 2024-07-23 16:02:31 +02:00
ptrace.c s390/fpu: remove anonymous union from struct fpu 2024-02-16 14:30:16 +01:00
reipl.S s390/kdump: Make kdump ready for lowcore relocation 2024-07-23 16:02:32 +02:00
relocate_kernel.S s390/relocate_kernel: adjust indentation 2023-04-19 17:24:18 +02:00
rethook.c
rethook.h
runtime_instr.c
setup.c s390/mm: Prevent lowcore vs identity mapping overlap 2024-08-21 16:14:45 +02:00
signal.c s390/vdso: Move vdso symbol handling to separate header file 2024-09-13 17:28:36 +02:00
smp.c s390/smp: Switch over to sysfs_emit() 2024-10-25 16:03:24 +02:00
stacktrace.c s390/ftrace: Avoid calling unwinder in ftrace_return_address() 2024-08-27 20:16:48 +02:00
sthyi.c s390/sthyi: Use cached data when diag is busy 2024-07-10 19:50:45 +02:00
syscall.c s390 updates for 6.11 merge window 2024-07-18 15:41:45 -07:00
sysinfo.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
text_amode31.S s390/hypfs_diag0c: fix virtual vs physical address confusion 2024-02-09 13:58:13 +01:00
time.c s390/time: Switch over to sysfs_emit() 2024-10-25 16:03:23 +02:00
topology.c s390/topology: Switch over to sysfs_emit() 2024-10-25 16:03:23 +02:00
trace.c
traps.c s390/mm/fault: Handle guest-related program interrupts in KVM 2024-10-29 11:49:18 +01:00
unwind_bc.c s390/unwind: disable KMSAN checks 2024-07-03 19:30:25 -07:00
uprobes.c s390/switch_to: use generic header file 2024-02-12 15:03:33 +01:00
uv.c s390/uv: Retrieve UV secrets sysfs support 2024-10-29 11:17:17 +01:00
vdso.c s390/vdso: Wire up getrandom() vdso implementation 2024-09-13 20:57:31 +02:00
vmcore_info.c s390/vmcoreinfo: Store virtual memory layout 2024-04-17 13:38:01 +02:00
vmlinux.lds.S asm-generic updates for 6.12 2024-09-26 11:54:40 -07:00
vtime.c s390/vtime: Remove duplicate get_lowcore() calls 2024-06-18 17:01:33 +02:00
wti.c s390/wti: Add debugfs file to display missed grace periods per cpu 2024-08-29 22:56:35 +02:00