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| author |   David Abdurachmanov <david.abdurachmanov@sifive.com> | 2019-10-04 17:12:22 -0700 |
|---|---|---|
| committer |   Paul Walmsley <paul.walmsley@sifive.com> | 2019-10-29 11:32:10 -0700 |
| commit | 5340627e3fe08030988bdda46dd86cd5d5fb7517 (patch) | |
| tree | b6c4e571320c67aaae6ade75feeee3420fcc55ac /arch/riscv/kernel/ptrace.c | |
| parent | RISC-V: Add PCIe I/O BAR memory mapping (diff) | |
| download | linux-dev-5340627e3fe08030988bdda46dd86cd5d5fb7517.tar.xz linux-dev-5340627e3fe08030988bdda46dd86cd5d5fb7517.zip | |
riscv: add support for SECCOMP and SECCOMP_FILTER
This patch was extensively tested on Fedora/RISCV (applied by default on
top of 5.2-rc7 kernel for <2 months). The patch was also tested with 5.3-rc
on QEMU and SiFive Unleashed board.
libseccomp (userspace) was rebased:
https://github.com/seccomp/libseccomp/pull/134
Fully passes libseccomp regression testing (simulation and live).
There is one failing kernel selftest: global.user_notification_signal
v1 -> v2:
- return immediately if secure_computing(NULL) returns -1
- fixed whitespace issues
- add missing seccomp.h
- remove patch #2 (solved now)
- add riscv to seccomp kernel selftest
Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>
Cc: keescook@chromium.org
Cc: me@carlosedp.com
Tested-by: Carlos de Paula <me@carlosedp.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/linux-riscv/CAEn-LTp=ss0Dfv6J00=rCAy+N78U2AmhqJNjfqjr2FDpPYjxEQ@mail.gmail.com/
Link: https://lore.kernel.org/linux-riscv/CAJr-aD=UnCN9E_mdVJ2H5nt=6juRSWikZnA5HxDLQxXLbsRz-w@mail.gmail.com/
[paul.walmsley@sifive.com: cleaned up Cc: lines; fixed spelling and
checkpatch issues; updated to apply]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch/riscv/kernel/ptrace.c')
| -rw-r--r-- | arch/riscv/kernel/ptrace.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c index 1252113ef8b2..0f84628b9385 100644 --- a/arch/riscv/kernel/ptrace.c +++ b/arch/riscv/kernel/ptrace.c @@ -154,6 +154,16 @@ __visible void do_syscall_trace_enter(struct pt_regs *regs) if (tracehook_report_syscall_entry(regs)) syscall_set_nr(current, regs, -1); + /* + * Do the secure computing after ptrace; failures should be fast. + * If this fails we might have return value in a0 from seccomp + * (via SECCOMP_RET_ERRNO/TRACE). + */ + if (secure_computing(NULL) == -1) { + syscall_set_nr(current, regs, -1); + return; + } + #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) trace_sys_enter(regs, syscall_get_nr(current, regs)); |