diff options
Diffstat (limited to 'debuggerd/crasher/crasher.cpp')
| -rw-r--r-- | debuggerd/crasher/crasher.cpp | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/debuggerd/crasher/crasher.cpp b/debuggerd/crasher/crasher.cpp index 288f1165e..64a38dd8c 100644 --- a/debuggerd/crasher/crasher.cpp +++ b/debuggerd/crasher/crasher.cpp @@ -36,6 +36,19 @@ #include "debuggerd/handler.h" #endif +#if defined(__arm__) +// See https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt for details. +#define __kuser_helper_version (*(int32_t*) 0xffff0ffc) +typedef void * (__kuser_get_tls_t)(void); +#define __kuser_get_tls (*(__kuser_get_tls_t*) 0xffff0fe0) +typedef int (__kuser_cmpxchg_t)(int oldval, int newval, volatile int *ptr); +#define __kuser_cmpxchg (*(__kuser_cmpxchg_t*) 0xffff0fc0) +typedef void (__kuser_dmb_t)(void); +#define __kuser_dmb (*(__kuser_dmb_t*) 0xffff0fa0) +typedef int (__kuser_cmpxchg64_t)(const int64_t*, const int64_t*, volatile int64_t*); +#define __kuser_cmpxchg64 (*(__kuser_cmpxchg64_t*) 0xffff0f60) +#endif + #define noinline __attribute__((__noinline__)) // Avoid name mangling so that stacks are more readable. @@ -142,22 +155,36 @@ static int usage() { fprintf(stderr, "where KIND is:\n"); fprintf(stderr, " smash-stack overwrite a -fstack-protector guard\n"); fprintf(stderr, " stack-overflow recurse until the stack overflows\n"); + fprintf(stderr, " nostack crash with a NULL stack pointer\n"); + fprintf(stderr, "\n"); fprintf(stderr, " heap-corruption cause a libc abort by corrupting the heap\n"); fprintf(stderr, " heap-usage cause a libc abort by abusing a heap function\n"); - fprintf(stderr, " nostack crash with a NULL stack pointer\n"); + fprintf(stderr, "\n"); fprintf(stderr, " abort call abort()\n"); fprintf(stderr, " assert call assert() without a function\n"); fprintf(stderr, " assert2 call assert() with a function\n"); fprintf(stderr, " exit call exit(1)\n"); + fprintf(stderr, "\n"); fprintf(stderr, " fortify fail a _FORTIFY_SOURCE check\n"); + fprintf(stderr, " seccomp fail a seccomp check\n"); +#if defined(__arm__) + fprintf(stderr, " kuser_helper_version call kuser_helper_version\n"); + fprintf(stderr, " kuser_get_tls call kuser_get_tls\n"); + fprintf(stderr, " kuser_cmpxchg call kuser_cmpxchg\n"); + fprintf(stderr, " kuser_memory_barrier call kuser_memory_barrier\n"); + fprintf(stderr, " kuser_cmpxchg64 call kuser_cmpxchg64\n"); +#endif + fprintf(stderr, "\n"); fprintf(stderr, " LOG_ALWAYS_FATAL call liblog LOG_ALWAYS_FATAL\n"); fprintf(stderr, " LOG_ALWAYS_FATAL_IF call liblog LOG_ALWAYS_FATAL_IF\n"); fprintf(stderr, " LOG-FATAL call libbase LOG(FATAL)\n"); + fprintf(stderr, "\n"); fprintf(stderr, " SIGFPE cause a SIGFPE\n"); fprintf(stderr, " SIGSEGV cause a SIGSEGV at address 0x0 (synonym: crash)\n"); fprintf(stderr, " SIGSEGV-non-null cause a SIGSEGV at a non-zero address\n"); fprintf(stderr, " SIGSEGV-unmapped mmap/munmap a region of memory and then attempt to access it\n"); fprintf(stderr, " SIGTRAP cause a SIGTRAP\n"); + fprintf(stderr, "\n"); fprintf(stderr, " fprintf-NULL pass a null pointer to fprintf\n"); fprintf(stderr, " readdir-NULL pass a null pointer to readdir\n"); fprintf(stderr, " strlen-NULL pass a null pointer to strlen\n"); @@ -235,6 +262,20 @@ noinline int do_action(const char* arg) { MAP_SHARED | MAP_ANONYMOUS, -1, 0)); munmap(map, sizeof(int)); map[0] = '8'; + } else if (!strcasecmp(arg, "seccomp")) { + syscall(99999); +#if defined(__arm__) + } else if (!strcasecmp(arg, "kuser_helper_version")) { + return __kuser_helper_version; + } else if (!strcasecmp(arg, "kuser_get_tls")) { + return !__kuser_get_tls(); + } else if (!strcasecmp(arg, "kuser_cmpxchg")) { + return __kuser_cmpxchg(0, 0, 0); + } else if (!strcasecmp(arg, "kuser_memory_barrier")) { + __kuser_dmb(); + } else if (!strcasecmp(arg, "kuser_cmpxchg64")) { + return __kuser_cmpxchg64(0, 0, 0); +#endif } else { return usage(); } |