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Code Issues Releases Activity

Issue #18684: Fixed reading out of the buffer in the re module.

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This commit is contained in:
Serhiy Storchaka 2015-07-06 14:03:01 +03:00
commit 02eae6b1f2
3 changed files with 43 additions and 14 deletions
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2
Misc/NEWS
View File

@ -17,6 +17,8 @@ Core and Builtins
Library
-------
- Issue #18684: Fixed reading out of the buffer in the re module.
- Issue #24259: tarfile now raises a ReadError if an archive is truncated
inside a data segment.

26
Modules/_sre.c
View File

@ -994,7 +994,7 @@ _sre_SRE_Pattern_split_impl(PatternObject *self, PyObject *string,
}
if (state.start == state.ptr) {
if (last == state.end)
if (last == state.end || state.ptr == state.end)
break;
/* skip one character */
state.start = (void*) ((char*) state.ptr + state.charsize);
@ -1191,6 +1191,8 @@ pattern_subx(PatternObject* self, PyObject* ptemplate, PyObject* string,
next:
/* move on */
if (state.ptr == state.end)
break;
if (state.ptr == state.start)
state.start = (void*) ((char*) state.ptr + state.charsize);
else
@ -2564,6 +2566,9 @@ _sre_SRE_Scanner_match_impl(ScannerObject *self)
PyObject* match;
Py_ssize_t status;
if (state->start == NULL)
Py_RETURN_NONE;
state_reset(state);
state->ptr = state->start;
@ -2575,10 +2580,14 @@ _sre_SRE_Scanner_match_impl(ScannerObject *self)
match = pattern_new_match((PatternObject*) self->pattern,
state, status);
if (status == 0 || state->ptr == state->start)
if (status == 0)
state->start = NULL;
else if (state->ptr != state->start)
state->start = state->ptr;
else if (state->ptr != state->end)
state->start = (void*) ((char*) state->ptr + state->charsize);
else
state->start = state->ptr;
state->start = NULL;
return match;
}
@ -2597,6 +2606,9 @@ _sre_SRE_Scanner_search_impl(ScannerObject *self)
PyObject* match;
Py_ssize_t status;
if (state->start == NULL)
Py_RETURN_NONE;
state_reset(state);
state->ptr = state->start;
@ -2608,10 +2620,14 @@ _sre_SRE_Scanner_search_impl(ScannerObject *self)
match = pattern_new_match((PatternObject*) self->pattern,
state, status);
if (status == 0 || state->ptr == state->start)
if (status == 0)
state->start = NULL;
else if (state->ptr != state->start)
state->start = state->ptr;
else if (state->ptr != state->end)
state->start = (void*) ((char*) state->ptr + state->charsize);
else
state->start = state->ptr;
state->start = NULL;
return match;
}

29
Modules/sre_lib.h
View File

@ -30,7 +30,7 @@ SRE(at)(SRE_STATE* state, SRE_CHAR* ptr, SRE_CODE at)
SRE_IS_LINEBREAK((int) ptr[-1]));
case SRE_AT_END:
return (((void*) (ptr+1) == state->end &&
return (((SRE_CHAR *)state->end - ptr == 1 &&
SRE_IS_LINEBREAK((int) ptr[0])) ||
((void*) ptr == state->end));
@ -1109,9 +1109,9 @@ entrance:
/* <ASSERT> <skip> <back> <pattern> */
TRACE(("|%p|%p|ASSERT %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[1]));
state->ptr = ctx->ptr - ctx->pattern[1];
if (state->ptr < state->beginning)
if (ctx->ptr - (SRE_CHAR *)state->beginning < (Py_ssize_t)ctx->pattern[1])
RETURN_FAILURE;
state->ptr = ctx->ptr - ctx->pattern[1];
DO_JUMP0(JUMP_ASSERT, jump_assert, ctx->pattern+2);
RETURN_ON_FAILURE(ret);
ctx->pattern += ctx->pattern[0];
@ -1122,8 +1122,8 @@ entrance:
/* <ASSERT_NOT> <skip> <back> <pattern> */
TRACE(("|%p|%p|ASSERT_NOT %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[1]));
state->ptr = ctx->ptr - ctx->pattern[1];
if (state->ptr >= state->beginning) {
if (ctx->ptr - (SRE_CHAR *)state->beginning >= (Py_ssize_t)ctx->pattern[1]) {
state->ptr = ctx->ptr - ctx->pattern[1];
DO_JUMP0(JUMP_ASSERT_NOT, jump_assert_not, ctx->pattern+2);
if (ret) {
RETURN_ON_ERROR(ret);
@ -1215,12 +1215,20 @@ SRE(search)(SRE_STATE* state, SRE_CODE* pattern)
SRE_CODE* overlap = NULL;
int flags = 0;
if (ptr > end)
return 0;
if (pattern[0] == SRE_OP_INFO) {
/* optimization info block */
/* <INFO> <1=skip> <2=flags> <3=min> <4=max> <5=prefix info> */
flags = pattern[2];
if (pattern[3] && end - ptr < (Py_ssize_t)pattern[3]) {
TRACE(("reject (got %u chars, need %u)\n",
(unsigned int)(end - ptr), pattern[3]));
return 0;
}
if (pattern[3] > 1) {
/* adjust end point (but make sure we leave at least one
character in there, so literal search will work) */
@ -1338,15 +1346,18 @@ SRE(search)(SRE_STATE* state, SRE_CODE* pattern)
break;
ptr++;
}
} else
} else {
/* general case */
while (ptr <= end) {
assert(ptr <= end);
while (1) {
TRACE(("|%p|%p|SEARCH\n", pattern, ptr));
state->start = state->ptr = ptr++;
state->start = state->ptr = ptr;
status = SRE(match)(state, pattern, 0);
if (status != 0)
if (status != 0 || ptr >= end)
break;
ptr++;
}
}
return status;
}