Consider this program: --- #include <stdlib.h> struct vectorinox { int size; int data[]; }; int main (void) { /* Make a vector of three elements. */ struct vectorinox *vector = malloc (sizeof (struct vectorinox) + sizeof(int) * 3); vector->size = 3; vector->data[0] = 11; vector->data[1] = 22; vector->data[2] = 33; return 0; } --- Trying to access an element of the `data` array in Python yields: >>> vec = gdb.parse_and_eval('vector') >>> data = vec['data'] >>> print(data[0]) Traceback (most recent call last): File "<stdin>", line 1, in <module> gdb.MemoryError: Cannot access memory at address 0x5535555592a0 And with GDB 9.2: >>> vec = gdb.parse_and_eval('vector') >>> data = vec['data'] >>> print(data[0]) 11 This failure was introduced by commit 7c6f27129631 ("gdb: make get_discrete_bounds check for non-constant range bounds"). Unfortunately, this commit doesn't build, but it's trivial to fix if you want to try it: just remove the parenthesis after `kind` that it introduces. val_subscript passes the array's index type (of type code TYPE_CODE_RANGE) to get_discrete_bounds. The index type has the low bound set to constant 0 and the high bound unknown. Before the commit, get_discrete_bounds would return "success" and set the low and high bound to 0. Although it's a bit by chance that it returned 0 for the high bound, since the bound was "unknown". It doesn't really matter in that case because the high bound doesn't get used by the caller. After the commit, the new check in get_discrete_bounds sees that the high bound isn't a constant, so returns "failure". However, val_subscript doesn't check the return value, and uses the uninitialized values of low and high bounds, and it goes downhill from there.
Actually, it doesn't to be from Python, as value_subscript is used by everything. It fails on the command line too: (gdb) p vector.data [1] Cannot access memory at address 0x5545555592a4
Proposed patch here: https://sourceware.org/pipermail/gdb-patches/2020-November/173496.html
The master branch has been updated by Simon Marchi <simark@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5b56203a7cadd545b33713e98e274e582242e090 commit 5b56203a7cadd545b33713e98e274e582242e090 Author: Simon Marchi <simon.marchi@efficios.com> Date: Wed Dec 9 13:52:12 2020 -0500 gdb: fix value_subscript when array upper bound is not known Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for non-constant range bounds"), subscripting flexible array member fails: struct no_size { int n; int items[]; }; (gdb) p *ns $1 = {n = 3, items = 0x5555555592a4} (gdb) p ns->items[0] Cannot access memory at address 0xfffe555b733a0164 (gdb) p *((int *) 0x5555555592a4) $2 = 101 <--- we would expect that (gdb) p &ns->items[0] $3 = (int *) 0xfffe5559ee829a24 <--- wrong address Since the flexible array member (items) has an unspecified size, the array type created for it in the DWARF doesn't have dimensions (this is with gcc 9.3.0, Ubuntu 20.04): 0x000000a4: DW_TAG_array_type DW_AT_type [DW_FORM_ref4] (0x00000038 "int") DW_AT_sibling [DW_FORM_ref4] (0x000000b3) 0x000000ad: DW_TAG_subrange_type DW_AT_type [DW_FORM_ref4] (0x00000031 "long unsigned int") This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined constant low bound (dynamic_prop with kind PROP_CONST) and an undefined high bound (dynamic_prop with kind PROP_UNDEFINED). value_subscript gets both bounds of that range using get_discrete_bounds. Before commit 7c6f27129631, get_discrete_bounds didn't check the kind of the dynamic_props and would just blindly read them as if they were PROP_CONST. It would return 0 for the high bound, because we zero-initialize the range_bounds structure. And it didn't really matter in this case, because the returned high bound wasn't used in the end. Commit 7c6f27129631 changed get_discrete_bounds to return a failure if either the low or high bound is not a constant, to make sure we don't read a dynamic prop that isn't a PROP_CONST as a PROP_CONST. This change made get_discrete_bounds start to return a failure for that range, and as a result would not set *lowp and *highp. And since value_subscript doesn't check get_discrete_bounds' return value, it just carries on an uses an uninitialized value for the low bound. If value_subscript did check the return value of get_discrete_bounds, we would get an error message instead of a bogus value. But it would still be a bug, as we wouldn't be able to print the flexible array member's elements. Looking at value_subscript, we see that the low bound is always needed, but the high bound is only needed if !c_style. So, change value_subscript to use get_discrete_low_bound and get_discrete_high_bound separately. This fixes the case described above, where the low bound is known but the high bound isn't (and is not needed). This restores the original behavior without accessing a dynamic_prop in a wrong way. A test is added. In addition to the case described above, a case with an array member of size 0 is added, which is a GNU C extension that existed before flexible array members were introduced. That case currently fails when compiled with gcc <= 8. gcc <= 8 produces DWARF similar to the one shown above, while gcc 9 adds a DW_AT_count of 0 in there, which makes the high bound known. A case where an array member of size 0 is the only member of the struct is also added, as that was how PR 28675 was originally reported, and it's an interesting corner case that I think could trigger other funny bugs. Question about the implementation: in value_subscript, I made it such that if the low or high bound is unknown, we fall back to zero. That effectively makes it the same as it was before 7c6f27129631. But should we instead error() out? gdb/ChangeLog: PR 26875, PR 26901 * gdbtypes.c (get_discrete_low_bound): Make non-static. (get_discrete_high_bound): Make non-static. * gdbtypes.h (get_discrete_low_bound): New declaration. (get_discrete_high_bound): New declaration. * valarith.c (value_subscript): Only fetch high bound if necessary. gdb/testsuite/ChangeLog: PR 26875, PR 26901 * gdb.base/flexible-array-member.c: New test. * gdb.base/flexible-array-member.exp: New test. Change-Id: I832056f80e6c56f621f398b4780d55a3a1e299d7
The gdb-10-branch branch has been updated by Simon Marchi <simark@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=138084b24811c191a85c919116d839a8bd89d57c commit 138084b24811c191a85c919116d839a8bd89d57c Author: Simon Marchi <simon.marchi@efficios.com> Date: Wed Dec 9 13:52:12 2020 -0500 gdb: fix value_subscript when array upper bound is not known Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for non-constant range bounds"), subscripting flexible array member fails: struct no_size { int n; int items[]; }; (gdb) p *ns $1 = {n = 3, items = 0x5555555592a4} (gdb) p ns->items[0] Cannot access memory at address 0xfffe555b733a0164 (gdb) p *((int *) 0x5555555592a4) $2 = 101 <--- we would expect that (gdb) p &ns->items[0] $3 = (int *) 0xfffe5559ee829a24 <--- wrong address Since the flexible array member (items) has an unspecified size, the array type created for it in the DWARF doesn't have dimensions (this is with gcc 9.3.0, Ubuntu 20.04): 0x000000a4: DW_TAG_array_type DW_AT_type [DW_FORM_ref4] (0x00000038 "int") DW_AT_sibling [DW_FORM_ref4] (0x000000b3) 0x000000ad: DW_TAG_subrange_type DW_AT_type [DW_FORM_ref4] (0x00000031 "long unsigned int") This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined constant low bound (dynamic_prop with kind PROP_CONST) and an undefined high bound (dynamic_prop with kind PROP_UNDEFINED). value_subscript gets both bounds of that range using get_discrete_bounds. Before commit 7c6f27129631, get_discrete_bounds didn't check the kind of the dynamic_props and would just blindly read them as if they were PROP_CONST. It would return 0 for the high bound, because we zero-initialize the range_bounds structure. And it didn't really matter in this case, because the returned high bound wasn't used in the end. Commit 7c6f27129631 changed get_discrete_bounds to return a failure if either the low or high bound is not a constant, to make sure we don't read a dynamic prop that isn't a PROP_CONST as a PROP_CONST. This change made get_discrete_bounds start to return a failure for that range, and as a result would not set *lowp and *highp. And since value_subscript doesn't check get_discrete_bounds' return value, it just carries on an uses an uninitialized value for the low bound. If value_subscript did check the return value of get_discrete_bounds, we would get an error message instead of a bogus value. But it would still be a bug, as we wouldn't be able to print the flexible array member's elements. Looking at value_subscript, we see that the low bound is always needed, but the high bound is only needed if !c_style. So, change value_subscript to use get_discrete_low_bound and get_discrete_high_bound separately. This fixes the case described above, where the low bound is known but the high bound isn't (and is not needed). This restores the original behavior without accessing a dynamic_prop in a wrong way. A test is added. In addition to the case described above, a case with an array member of size 0 is added, which is a GNU C extension that existed before flexible array members were introduced. That case currently fails when compiled with gcc <= 8. gcc <= 8 produces DWARF similar to the one shown above, while gcc 9 adds a DW_AT_count of 0 in there, which makes the high bound known. A case where an array member of size 0 is the only member of the struct is also added, as that was how PR 28675 was originally reported, and it's an interesting corner case that I think could trigger other funny bugs. Question about the implementation: in value_subscript, I made it such that if the low or high bound is unknown, we fall back to zero. That effectively makes it the same as it was before 7c6f27129631. But should we instead error() out? gdb/ChangeLog: PR 26875, PR 26901 * gdbtypes.c (get_discrete_low_bound): Make non-static. (get_discrete_high_bound): Make non-static. * gdbtypes.h (get_discrete_low_bound): New declaration. (get_discrete_high_bound): New declaration. * valarith.c (value_subscript): Only fetch high bound if necessary. gdb/testsuite/ChangeLog: PR 26875, PR 26901 * gdb.base/flexible-array-member.c: New test. * gdb.base/flexible-array-member.exp: New test. Change-Id: I832056f80e6c56f621f398b4780d55a3a1e299d7
This is now fixed.
This failure was introduced by commit 7c6f27129631 ("gdb: make get_discrete_bounds check for non-constant range bounds"). Unfortunately, this commit doesn't build, but it's trivial to fix if you want to try it: just remove the parenthesis after `kind` that it introduces. val_subscript passes the array's index type (of type code TYPE_CODE_RANGE) to get_discrete_bounds. The index type has the low bound set to constant 0 and the high bound unknown. Before the commit, get_discrete_bounds would return "success" and set the low and high bound to 0. Although it's a bit by chance that it returned 0 for the high bound, since the bound was "unknown". It doesn't really matter in that case because the high bound doesn't get used by the caller. After the commit, the new check in get_discrete_bounds sees that the high bound isn't a constant, so returns "failure". However, val_subscript doesn't check the return value, and uses the uninitialized values of low and high bounds, and it goes downhill from there. http://mirei.xyz/
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stepping over thread-lock related codes (in uClibc), the inferior process gets stuck and never manages to enter the critical section: http://www-look-4.com/ ------8<------- 1 size_t fwrite(const void * __restrict ptr, size_t size, 2 size_t nmemb, register FILE * __restrict stream) 3 { http://www.compilatori.com/ 4 size_t retval; 5 __STDIO_AUTO_THREADLOCK_VAR; 6 http://www.wearelondonmade.com/ 7 > __STDIO_AUTO_THREADLOCK(stream); 8 9 retval = fwrite_unlocked(ptr, size, nmemb, stream); http://www.jopspeech.com/ 10 11 __STDIO_AUTO_THREADUNLOCK(stream); 12 http://joerg.li/ 13 return retval; 14 } ------>8------- http://connstr.net/ Here, we are at line 7. Using the "next" command leads no where. However, setting a breakpoint on line 9 and issuing "continue" works. http://embermanchester.uk/ Looking at the assembly instructions reveals that we're dealing with the http://www.slipstone.co.uk/ critical section entry code [1] that should never be interrupted, in this case by the debugger's implicit breakpoints: ------8<------- ... http://www.logoarts.co.uk/ 1 add_s r0,r13,0x38 2 mov_s r3,1 3 llock r2,[r0] <-. 4 brne.nt r2,0,14 --. | 5 scond r3,[r0] | | 6 bne -10 --|--' 7 brne_s r2,0,84 <-' ... http://www.acpirateradio.co.uk/ ------>8------- Lines 3 until 5 (inclusive) are supposed to be executed atomically. Therefore, GDB should never (implicitly) insert a breakpoint on lines 4 and 5, else the program will try to acquire the https://waytowhatsnext.com/ lock again by jumping back to line 3 and gets stuck in an infinite loop. The solution is to make GDB aware of these patterns so it inserts breakpoints after the sequence -- line 6 in this example. [1] https://cgit.uclibc-ng.org/cgi/cgit/uclibc- https://www.webb-dev.co.uk/ ng.git/tree/libc/sysdeps/linux/arc/bits/atomic.h#n46 ------8<------- #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ ({ \ __typeof(oldval) prev; http://www.iu-bloomington.com/ \ \ __asm__ __volatile__( \ "1: llock %0, [%1] \n" \ " brne %0, %2, 2f \n" \ " scond %3, [%1] \n" \ " bnz 1b \n" \ "2: \n" \ : "=&r"(prev) \ : "r"(mem), "ir"(oldval), https://komiya-dental.com/ \ "r"(newval) /* can't be "ir". scond can't take limm for "b" */\ : "cc", "memory"); \ \ prev; \
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gdb: fix value_subscript when array upper bound is not known http://www-look-4.com/category/health/ Since commit 7c6f27129631 ("gdb: make get_discrete_bounds check for https://komiya-dental.com/category/crypto/ non-constant range bounds"), subscripting flexible array member fails: http://www.iu-bloomington.com/category/health/ struct no_size { https://waytowhatsnext.com/category/health/ int n; int items[]; }; http://www.wearelondonmade.com/category/health/ (gdb) p *ns $1 = {n = 3, items = 0x5555555592a4} (gdb) p ns->items[0] http://www.jopspeech.com/category/health/ Cannot access memory at address 0xfffe555b733a0164 (gdb) p *((int *) 0x5555555592a4) $2 = 101 <--- we would expect that http://joerg.li/category/health/ (gdb) p &ns->items[0] $3 = (int *) 0xfffe5559ee829a24 <--- wrong address http://connstr.net/category/health/ Since the flexible array member (items) has an unspecified size, the array type created for it in the DWARF doesn't have dimensions (this is with gcc 9.3.0, http://embermanchester.uk/category/health/ Ubuntu 20.04): http://www.slipstone.co.uk/category/health/ 0x000000a4: DW_TAG_array_type DW_AT_type [DW_FORM_ref4] (0x00000038 "int") DW_AT_sibling [DW_FORM_ref4] (0x000000b3) http://www.logoarts.co.uk/category/health/ 0x000000ad: DW_TAG_subrange_type DW_AT_type [DW_FORM_ref4] (0x00000031 "long unsigned int") http://www.acpirateradio.co.uk/category/health/ This causes GDB to create a range type (TYPE_CODE_RANGE) with a defined constant low bound (dynamic _prop with kind PROP_CONST) and an undefined high bound (dynamic_prop with kind PROP_UNDEFINED). http://www.compilatori.com/category/health/ value_subscript gets both bounds of that range using get_discrete_bounds. Before commit 7c6f27129631, get_discrete_bounds didn't check the kind of the dynamic_props and would just blindly read them as if they were PROP_CONST. https://www.webb-dev.co.uk/category/health/ It would return 0 for the high bound, because we zero-initialize the range_bounds structure. And it didn't really matter in this case, because the returned high bound wasn't used in the end. https://pro-sangyoui.com/ https://fintechzoom.com/reviews/15-best-water-bottles-of-2021/ https://fintechzoom.com/reviews/10-best-yoga-mats-of-2021/ https://wikifinancepedia.com/ https://financeplusinsurance.com/ https://financeinsuranceblog.com/ https://fintechzoom.com/reviews/the-greatest-robot-vacuums-for-assure-cleaner-floors/ https://fintechzoom.com/reviews/the-11-best-air-purifiers-in-2021/ https://fintechzoom.com/reviews/the-6-best-cordless-stick-vacuum-in-2021/ https://amazon.com/Christopher-Horne/e/B08D6C1D2P%3Fref=dbs_a_mng_rwt_scns_share https://nhacai888b.com/ https://www.soicau888.net/ https://kaiyokukan.vn/ http://twin688.net/ https://typhu88.me/ https://fitveform.com/ https://www.thegamblinggurus.com/ https://nodepositpokeronline.com/ https://onlinecasinoku.com/ https://slickcashloanca.blogspot.com/ https://www.aaz-credit-immobilier.com/ https://www.sport-trader.com/ https://www.lespersiennes.com/ https://www.espresso-international.it/ https://www.espresso-international.fi/ https://footballexpress.in/category/indian-football/ https://sixsports.in/category/cricket/ https://true-tech.net/ https://www.alivechristians.com/bible-verses-about-healing-sickness/ https://photoslate.co/ https://trellising-net.com/ https://www.seminariostop.com/seminarios-y-talleres/como-importar-de-china-alibaba-aliexpress-dropshipping-peru/ https://bestonlinegambler.com/ https://vipcasinotips.com/ https://casinogamblingideas.com/ https://realmoneycasinoguides.com/ https://casinoexpertadvice.com/ https://komopoker5.com/ https://zehabesha.com/
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