Steven Rostedt (VMware)
c65755f595
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing ...
commit 9913d5745bd720c4266805c8d29952a3702e4eca upstream.
All internal use cases for tracepoint_probe_register() is set to not ever
be called with the same function and data. If it is, it is considered a
bug, as that means the accounting of handling tracepoints is corrupted.
If the function and data for a tracepoint is already registered when
tracepoint_probe_register() is called, it will call WARN_ON_ONCE() and
return with EEXISTS.
The BPF system call can end up calling tracepoint_probe_register() with
the same data, which now means that this can trigger the warning because
of a user space process. As WARN_ON_ONCE() should not be called because
user space called a system call with bad data, there needs to be a way to
register a tracepoint without triggering a warning.
Enter tracepoint_probe_register_may_exist(), which can be called, but will
not cause a WARN_ON() if the probe already exists. It will still error out
with EEXIST, which will then be sent to the user space that performed the
BPF system call.
This keeps the previous testing for issues with other users of the
tracepoint code, while letting BPF call it with duplicated data and not
warn about it.
Link: https://lore.kernel.org/lkml/20210626135845.4080-1-penguin-kernel@I-love.SAKURA.ne.jp/
Link: https://syzkaller.appspot.com/bug?id=41f4318cf01762389f4d1c1c459da4f542fe5153
Cc: stable@vger.kernel.org
Fixes: c4f6699dfcsyzbot+721aa903751db87aa244@syzkaller.appspotmail.com
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-14 16:53:08 +02:00
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posix-timers: Preserve return value in clock_adjtime32()
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tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-14 16:53:08 +02:00
kbuild: update config_data.gz only when the content of .config is changed
2021-05-11 14:04:16 +02:00
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
audit: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 13:17:32 +02:00
audit: fix a net reference leak in audit_list_rules_send()
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kernel/cpu_pm: Fix uninitted local in cpu_pm
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2020-01-17 19:48:42 +01:00
don't dump the threads that had been already exiting when zapped.
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fail_function: Remove a redundant mutex unlock
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Revert "libata, freezer: avoid block device removal while system is frozen"
2019-10-06 09:11:37 -06:00
mm, futex: fix shared futex pgoff on shmem huge page
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kallsyms: Refactor kallsyms_show_value() to take cred
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exec: Transform exec_update_mutex into a rw_semaphore
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2021-02-03 23:25:56 +01:00
kernel: kexec_file: fix error return code of kexec_calculate_store_digests()
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2021-06-30 08:47:51 -04:00
kbuild: update config_data.gz only when the content of .config is changed
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module: limit enabling module.sig_enforce
2021-06-30 08:47:42 -04:00
module: harden ELF info handling
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module: harden ELF info handling
2021-04-07 14:47:38 +02:00
kernel/notifier.c: intercept duplicate registrations to avoid infinite loops
2020-10-01 13:17:23 +02:00
padata: add separate cpuhp node for CPUHP_PADATA_DEAD
2020-06-17 16:40:22 +02:00
panic: ensure preemption is disabled during panic()
2019-10-07 15:47:19 -07:00
ptrace: make ptrace() fail if the tracee changed its pid unexpectedly
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reboot: fix overflow parsing reboot cpu number
2020-11-18 19:20:30 +01:00
kernel/relay.c: fix memleak on destroy relay channel
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/dev/mem: Revoke mappings when a driver claims the region
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seccomp: Add missing return in non-void function
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ptrace: fix task_join_group_stop() for the case when current is traced
2020-11-10 12:37:24 +01:00
smp: Fix smp_call_function_single_async prototype
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kthread: Extract KTHREAD_IS_PER_CPU
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stacktrace: Don't skip first entry on noncurrent tasks
2019-11-04 21:19:25 +01:00
stop_machine: Avoid potential race behaviour
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kernel/sys.c: avoid copying possible padding bytes in copy_to_user
2020-10-01 13:17:23 +02:00
kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()
2020-10-01 13:17:10 +02:00
sysctl.c: fix underflow value setting risk in vm_table
2021-03-17 17:03:45 +01:00
taskstats: fix data-race
2020-01-09 10:19:54 +01:00
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-14 16:53:08 +02:00
usermodehelper: reset umask to default before executing user process
2020-10-14 10:32:58 +02:00
smp: Fix smp_call_function_single_async prototype
2021-05-14 09:44:33 +02:00
watchdog/softlockup: Enforce that timestamp is valid on boot
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wq: handle VM suspension in stall detection
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c65755f595