linux

iv/linux

History

Rich Felker b0cfc315ff sh: fix syscall tracing

Addition of SECCOMP_FILTER exposed a longstanding bug in
do_syscall_trace_enter, whereby r0 (the 5th argument register) was
mistakenly used where r3 (syscall_nr) was intended. By overwriting r0
rather than r3 with -1 when attempting to block a syscall, the
existing code would instead have caused the syscall to execute with an
argument clobbered.

Commit 0bb605c2c7f2b4b3 then introduced skipping of the syscall when
do_syscall_trace_enter returns -1, so that the return value set by
seccomp filters would not be clobbered by -ENOSYS. This eliminated the
clobbering of the 5th argument register, but instead caused syscalls
made with a 5th argument of -1 to be misinterpreted as a request by
do_syscall_trace_enter to suppress the syscall.

Fixes: 0bb605c2c7f2b4b3 ("sh: Add SECCOMP_FILTER")
Fixes: ab99c733ae73cce3 ("sh: Make syscall tracer use tracehook notifiers, add TIF_NOTIFY_RESUME.")
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Rich Felker <dalias@libc.org>

2020-09-13 21:22:55 -04:00

boards

sh: landisk: Add missing initialization of sh_io_port_base

2020-08-14 22:43:17 -04:00

boot

kbuild: introduce ccflags-remove-y and asflags-remove-y

2020-08-10 01:32:59 +09:00

cchips

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-14 01:57:21 +09:00

configs

Cleanup, SECCOMP_FILTER support, message printing fixes, and other