In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Mark syscall helpers as sleepable<\/p>\n
bpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes,
\nallocate with GFP_KERNEL, and wait for an RCU grace period.
\nbpf_sys_close() reaches close_fd() and filp_close(), which can sleep as
\nwell.<\/p>\n
Both helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is
\nsleepable. That does not make every callback sleepable: a syscall program
\ncan register a bpf_timer callback, and the verifier checks that callback
\nin a non-sleepable context while retaining the syscall helper set.<\/p>\n
Without .might_sleep on the prototypes, such a callback can invoke
\nbpf_sys_bpf() from hrtimer softirq context and trigger a
\nscheduling-while-atomic failure. bpf_sys_close() is exposed through the
\nsame missing context check.<\/p>\n
Set .might_sleep on both prototypes so the existing helper-context check
\nrejects them from timer callbacks and other atomic regions. Calls from the
\nsleepable main body remain valid.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Mark syscall helpers as sleepable<\/p>\n
bpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes,
\nallocate with GFP_K<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29213","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=29213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}