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1 // Copyright (c) 2005, Google Inc. | 1 // Copyright (c) 2005, Google Inc. |
2 // All rights reserved. | 2 // All rights reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // * Redistributions of source code must retain the above copyright | 8 // * Redistributions of source code must retain the above copyright |
9 // notice, this list of conditions and the following disclaimer. | 9 // notice, this list of conditions and the following disclaimer. |
10 // * Redistributions in binary form must reproduce the above | 10 // * Redistributions in binary form must reproduce the above |
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57 #include <stdint.h> // for uintptr_t | 57 #include <stdint.h> // for uintptr_t |
58 #endif | 58 #endif |
59 #ifdef HAVE_UNISTD_H | 59 #ifdef HAVE_UNISTD_H |
60 #include <unistd.h> | 60 #include <unistd.h> |
61 #endif | 61 #endif |
62 #ifdef HAVE_MMAP | 62 #ifdef HAVE_MMAP |
63 #include <sys/mman.h> // for msync | 63 #include <sys/mman.h> // for msync |
64 #include "base/vdso_support.h" | 64 #include "base/vdso_support.h" |
65 #endif | 65 #endif |
66 | 66 |
67 #include "gperftools/stacktrace.h" | 67 #include "google/stacktrace.h" |
68 #if defined(KEEP_SHADOW_STACKS) | 68 #if defined(KEEP_SHADOW_STACKS) |
69 #include "linux_shadow_stacks.h" | 69 #include "linux_shadow_stacks.h" |
70 #endif // KEEP_SHADOW_STACKS | 70 #endif // KEEP_SHADOW_STACKS |
71 | 71 |
72 #if defined(__linux__) && defined(__i386__) && defined(__ELF__) && defined(HAVE_
MMAP) | 72 #if defined(__linux__) && defined(__i386__) && defined(__ELF__) && defined(HAVE_
MMAP) |
73 // Count "push %reg" instructions in VDSO __kernel_vsyscall(), | 73 // Count "push %reg" instructions in VDSO __kernel_vsyscall(), |
74 // preceeding "syscall" or "sysenter". | 74 // preceeding "syscall" or "sysenter". |
75 // If __kernel_vsyscall uses frame pointer, answer 0. | 75 // If __kernel_vsyscall uses frame pointer, answer 0. |
76 // | 76 // |
77 // kMaxBytes tells how many instruction bytes of __kernel_vsyscall | 77 // kMaxBytes tells how many instruction bytes of __kernel_vsyscall |
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234 if (STRICT_UNWINDING) { | 234 if (STRICT_UNWINDING) { |
235 // With the stack growing downwards, older stack frame must be | 235 // With the stack growing downwards, older stack frame must be |
236 // at a greater address that the current one. | 236 // at a greater address that the current one. |
237 if (new_sp <= old_sp) return NULL; | 237 if (new_sp <= old_sp) return NULL; |
238 // Assume stack frames larger than 100,000 bytes are bogus. | 238 // Assume stack frames larger than 100,000 bytes are bogus. |
239 if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL; | 239 if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL; |
240 } else { | 240 } else { |
241 // In the non-strict mode, allow discontiguous stack frames. | 241 // In the non-strict mode, allow discontiguous stack frames. |
242 // (alternate-signal-stacks for example). | 242 // (alternate-signal-stacks for example). |
243 if (new_sp == old_sp) return NULL; | 243 if (new_sp == old_sp) return NULL; |
244 if (new_sp > old_sp) { | 244 // And allow frames upto about 1MB. |
245 // And allow frames upto about 1MB. | 245 if ((new_sp > old_sp) |
246 const uintptr_t delta = (uintptr_t)new_sp - (uintptr_t)old_sp; | 246 && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL; |
247 const uintptr_t acceptable_delta = 1000000; | |
248 if (delta > acceptable_delta) { | |
249 return NULL; | |
250 } | |
251 } | |
252 } | 247 } |
253 if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL; | 248 if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL; |
254 #ifdef __i386__ | 249 #ifdef __i386__ |
255 // On 64-bit machines, the stack pointer can be very close to | 250 // On 64-bit machines, the stack pointer can be very close to |
256 // 0xffffffff, so we explicitly check for a pointer into the | 251 // 0xffffffff, so we explicitly check for a pointer into the |
257 // last two pages in the address space | 252 // last two pages in the address space |
258 if ((uintptr_t)new_sp >= 0xffffe000) return NULL; | 253 if ((uintptr_t)new_sp >= 0xffffe000) return NULL; |
259 #endif | 254 #endif |
260 #ifdef HAVE_MMAP | 255 #ifdef HAVE_MMAP |
261 if (!STRICT_UNWINDING) { | 256 if (!STRICT_UNWINDING) { |
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387 n++; | 382 n++; |
388 continue; | 383 continue; |
389 } | 384 } |
390 } | 385 } |
391 break; | 386 break; |
392 } | 387 } |
393 } | 388 } |
394 #endif // KEEP_SHADOW_STACKS | 389 #endif // KEEP_SHADOW_STACKS |
395 return n; | 390 return n; |
396 } | 391 } |
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