mirror of https://github.com/torvalds/linux.git
c2219eda54
This patch fixes two bugs in the Microblaze syscall trap handler when an invalid syscall ID is used. First, the range check on line 351 only checks for syscall IDs greater than __NR_syscalls. A negative syscall ID (either passed to `syscall()` or as returned by `do_syscall_trace_enter()` on error) will still satisfy this test and cause the Linux kernel to access an invalid memory location and cause a kernel oops. This has been fixed by also checking for r12 < 0. Secondly, the current error recovery at line 378 returns using the wrong register (r15 instead of r14) and does not restore the previous stack state. This has been fixed by invoking `ret_from_trap` on error, setting r3 to `-ENOSYS`, similar to what would happen when calling a valid syscall. Signed-off-by: Jamie Garside <jamie.garside@york.ac.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com> |
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| .. | ||
| cpu | ||
| .gitignore | ||
| Makefile | ||
| asm-offsets.c | ||
| dma.c | ||
| early_printk.c | ||
| entry-nommu.S | ||
| entry.S | ||
| exceptions.c | ||
| ftrace.c | ||
| head.S | ||
| heartbeat.c | ||
| hw_exception_handler.S | ||
| intc.c | ||
| irq.c | ||
| kgdb.c | ||
| mcount.S | ||
| microblaze_ksyms.c | ||
| misc.S | ||
| module.c | ||
| platform.c | ||
| process.c | ||
| prom.c | ||
| ptrace.c | ||
| reset.c | ||
| setup.c | ||
| signal.c | ||
| stacktrace.c | ||
| sys_microblaze.c | ||
| syscall_table.S | ||
| timer.c | ||
| traps.c | ||
| unwind.c | ||
| vmlinux.lds.S | ||