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 0bb605c2c7 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: 0bb605c2c7 ("sh: Add SECCOMP_FILTER") Fixes: ab99c733ae ("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
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configs	Cleanup, SECCOMP_FILTER support, message printing fixes, and other	2020-08-15 18:50:32 -07:00
drivers	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
include	sh: remove spurious circular inclusion from asm/smp.h	2020-09-13 21:11:40 -04:00
kernel	sh: fix syscall tracing	2020-09-13 21:22:55 -04:00
lib	…
math-emu	…
mm	Cleanup, SECCOMP_FILTER support, message printing fixes, and other	2020-08-15 18:50:32 -07:00
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