lwn.git/arch/mips/kernel/scall32-o32.S, branch standardize-docs

MIPS: Wire up statx system call

2017-03-08T11:11:13+00:00

Wire up the statx system call for MIPS, which was introduced in commit a528d35e8bfc ("statx: Add a system call to make enhanced file info available"). Signed-off-by: James Hogan Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15387/ Signed-off-by: Ralf Baechle

MIPS: Wire up new pkey_{mprotect,alloc,free} syscalls

2016-10-14T18:05:13+00:00

Signed-off-by: Marcin Nowakowski Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14380/ Signed-off-by: Ralf Baechle Signed-off-by: Linus Torvalds

MIPS: scall: Handle seccomp filters which redirect syscalls

2016-05-13T12:02:00+00:00

Commit d218af78492a ("MIPS: scall: Always run the seccomp syscall filters") modified the syscall code to always call the seccomp filters, but missed the case where a filter may redirect the syscall, as revealed by the seccomp_bpf self test. The syscall path now restores the syscall from the stack after the filter rather than saving it locally. Syscall number checking and syscall function table lookup is done after the filter may have run such that redirected syscalls are also checked, and executed. The regular path of syscall number checking and pointer lookup is also made more consistent between ABIs with scall64-64.S being the reference. With this patch in place, the seccomp_bpf self test now passes TRACE_syscall.syscall_redirected and TRACE_syscall.syscall_dropped on all MIPS ABIs. Fixes: d218af78492a ("MIPS: scall: Always run the seccomp syscall filters") Signed-off-by: Matt Redfearn Acked-by: Kees Cook Cc: Eric B Munson Cc: James Hogan Cc: Andrew Morton Cc: linux-mips@linux-mips.org Cc: IMG-MIPSLinuxKerneldevelopers@imgtec.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/12916/ Signed-off-by: Ralf Baechle

MIPS: Wire up preadv2 and pwrite2 syscalls.

2016-04-03T07:41:34+00:00

Signed-off-by: Ralf Baechle

MIPS: Wire up copy_file_range syscall.

2016-02-05T16:15:42+00:00

Signed-off-by: Ralf Baechle

mips: add entry for new mlock2 syscall

2015-11-09T23:11:24+00:00

A previous commit introduced the new mlock2 syscall, add entries for the MIPS architecture. Signed-off-by: Eric B Munson Acked-by: Ralf Baechle Cc: Catalin Marinas Cc: Geert Uytterhoeven Cc: Guenter Roeck Cc: Heiko Carstens Cc: Jonathan Corbet Cc: Kirill A. Shutemov Cc: Michael Kerrisk Cc: Michal Hocko Cc: Shuah Khan Cc: Stephen Rothwell Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

MIPS: scall: Always run the seccomp syscall filters

2015-10-04T10:10:56+00:00

The MIPS syscall handler code used to return -ENOSYS on invalid syscalls. Whilst this is expected, it caused problems for seccomp filters because the said filters never had the change to run since the code returned -ENOSYS before triggering them. This caused problems on the chromium testsuite for filters looking for invalid syscalls. This has now changed and the seccomp filters are always run even if the syscall is invalid. We return -ENOSYS once we return from the seccomp filters. Moreover, similar codepaths have been merged in the process which simplifies somewhat the overall syscall code. Signed-off-by: Markos Chandras Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11236/ Signed-off-by: Ralf Baechle

MIPS: Wire up userfaultfd and membarrier syscalls.

2015-09-30T12:24:31+00:00

Signed-off-by: Ralf Baechle

MIPS: O32: Do not handle require 32 bytes from the stack to be readable.

2015-07-08T03:03:30+00:00

Commit 46e12c07b3b9603c60fc1d421ff18618241cb081 (MIPS: O32 / 32-bit: Always copy 4 stack arguments.) change the O32 syscall handler to always load four arguments from the userspace stack even for syscalls that require fewer or no arguments to be copied. This removes a large table from kernel space and need to maintain it. It appeared that it was ok the implementation chosen requires 16 bytes of readable stack space above the user stack pointer. Turned out a few threading implementations munmap the user stack before the thread exits resulting in errors due to the unreadable stack. We now treat any failed load as a if the loaded value was zero and let the actual syscall deal with the situation. Signed-off-by: Ralf Baechle

MIPS: Fix restart of indirect syscalls

2015-01-15T23:35:45+00:00

When 32-bit MIPS userspace invokes a syscall indirectly via syscall(number, arg1, ..., arg7), the kernel looks up the actual syscall based on the given number, shifts the other arguments to the left, and jumps to the syscall. If the syscall is interrupted by a signal and indicates it needs to be restarted by the kernel (by returning ERESTARTNOINTR for example), the syscall must be called directly, since the number is no longer the first argument, and the other arguments are now staged for a direct call. Before shifting the arguments, store the syscall number in pt_regs->regs[2]. This gets copied temporarily into pt_regs->regs[0] after the syscall returns. If the syscall needs to be restarted, handle_signal()/do_signal() copies the number back to pt_regs->reg[2], which ends up in $v0 once control returns to userspace. Signed-off-by: Ed Swierk Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8929/ Signed-off-by: Ralf Baechle