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Matheus
d214326e8e
For some usecases, silencing syscall_print()s is ideal. A good example of that is syzkaller, which uses logs to detect crashes and a badly timed syscall_print() could interfere. Add a nouserprint argument which skips printing on syscall_print().
49 lines
910 B
C
49 lines
910 B
C
#include <kernel/syscalls.h>
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#include <printf.h>
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#include <arch/e9.h>
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#include <mutex.h>
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#include <util.h>
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#include <arch/cpu.h>
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#include <kernel/kernel_args.h>
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DEFINE_KERNEL_ARGUMENT(nouserprint, bool);
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syscallret_t syscall_print(context_t *context, char *message) {
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syscallret_t ret = {
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.ret = -1
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};
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if (GET_KERNEL_ARGUMENT(nouserprint, bool))
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goto leave;
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static MUTEX_DEFINE(mutex);
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size_t len;
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ret.errno = usercopy_strlen(message, &len);
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if (ret.errno)
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return ret;
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len = min(len, 1023);
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char msg[1024];
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ret.errno = usercopy_fromuser(msg, message, len);
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if (ret.errno)
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return ret;
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msg[len] = '\0';
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char prefix[100];
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snprintf(prefix, 100, "pid %d tid %d: ", current_thread()->proc->pid, current_thread()->tid);
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MUTEX_ACQUIRE(&mutex);
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arch_e9_puts(prefix);
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arch_e9_puts(msg);
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arch_e9_putc('\n');
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MUTEX_RELEASE(&mutex);
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leave:
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ret.errno = 0;
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ret.ret = 0;
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return ret;
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}
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