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libsodium/test/default/sodium_utils3.c

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Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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CompCert compatibility
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#include <stdlib.h>
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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#include <sys/types.h>
#include <limits.h>
#include <signal.h>
#define TEST_NAME "sodium_utils3"
#include "cmptest.h"
SIGSEGV handlers are incompatible with -fsanitize=address
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#ifdef __SANITIZE_ADDRESS__
Check that SIGSEGV handlers work Tools such as ASAN may trap violations instead of our handlers, making the sodium_utils{2,3} test fail. This has been documented for a long time, but it's probably better to detect this and ignore tests depending on working signal handlers.
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# warning The sodium_utils3 test is expected to fail with address sanitizer
SIGSEGV handlers are incompatible with -fsanitize=address
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#endif
Indent
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__attribute__((noreturn)) static void
segv_handler(int sig)
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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{
Unused param
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(void) sig;
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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printf("Intentional segfault / bus error caught\n");
printf("OK\n");
#ifdef SIGSEGV
signal(SIGSEGV, SIG_DFL);
#endif
#ifdef SIGBUS
signal(SIGBUS, SIG_DFL);
#endif
#ifdef SIGABRT
signal(SIGABRT, SIG_DFL);
#endif
exit(0);
}
Indent
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int
main(void)
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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{
Indent
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void * buf;
Consistent syle for the tests.
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size_t size;
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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#ifdef SIGSEGV
signal(SIGSEGV, segv_handler);
#endif
#ifdef SIGBUS
signal(SIGBUS, segv_handler);
#endif
#ifdef SIGABRT
signal(SIGABRT, segv_handler);
#endif
Avoid implicit sodium_malloc(0) in tests
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size = 1U + randombytes_uniform(100000U);
Indent
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buf = sodium_malloc(size);
Add extra assert() in tests allocating memory on the heap.
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assert(buf != NULL);
Add a workaround for old asan versions (CentOS 7)
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/* old versions of asan emit a warning because they don't support mlock*() */
#ifndef __SANITIZE_ADDRESS__
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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sodium_mprotect_noaccess(buf);
sodium_mprotect_readwrite(buf);
Add a workaround for old asan versions (CentOS 7)
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#endif
Check that SIGSEGV handlers work Tools such as ASAN may trap violations instead of our handlers, making the sodium_utils{2,3} test fail. This has been documented for a long time, but it's probably better to detect this and ignore tests depending on working signal handlers.
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#if defined(HAVE_CATCHABLE_SEGV) && !defined(__EMSCRIPTEN__) && !defined(__SANITIZE_ADDRESS__)
Indent
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sodium_memzero(((unsigned char *) buf) - 8, 8U);
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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sodium_mprotect_readonly(buf);
sodium_free(buf);
printf("Underflow not caught\n");
Add a workaround for old asan versions (CentOS 7)
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#else
segv_handler(0);
Don't expect signals to work in Javascript
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#endif
Add sodium_{malloc,allocarray,free}() and sodium_mprotect_*() ptr = sodium_malloc(size) returns a pointer from which exactly "size" bytes can be accessed. ptr = sodium_allocarray(count, size) allocates enough storage space for "count" pointers or scalars of unit size "size". In both cases, the region is immediately followed by a guard page. As a result, any attempt to access a memory location after ptr[size - 1] will immediately trigger a segmentation fault. The allocated region is mlock()ed and filled with 0xd0 bytes. A read-only page with the size, a guard page, as well as a canary are placed before the returned pointer. The canary is checked by sodium_free(); as a result, altering data right before ptr is likely to cause sodium_free() to kill the process. sodium_free() munlock()s the region and fills it with zeros before actually calling free(). sodium_mprotect_noaccess(), sodium_mprotect_readonly() and sodium_mprotect_readwrite() can be used to change the protection on the set of allocated pages. Reverting the protection to read+write is not required before calling sodium_free().
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return 0;
}
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