| Summary: | strncat(..., ..., SIZE_MAX) behaves incorrectly | ||
|---|---|---|---|
| Product: | glibc | Reporter: | Xavier Roche <roche> |
| Component: | string | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | adhemerval.zanella, drepper.fsp, gulsenenginar, mark, mehmetgelisin, mervegunesli, ucelsanicin |
| Priority: | P2 | Flags: | fweimer:
security-
|
| Version: | 2.19 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Last reconfirmed: | ||
| Attachments: | Test case | ||
|
Description
Xavier Roche
2014-08-16 09:58:17 UTC
Marking as duplicate of BZ#19390. *** This bug has been marked as a duplicate of bug 19390 *** https://komiya-dental.com/ http://steemfilter.space/ http://michielleunens.tech/ http://sleepypoetstuff.website/ http://biciclubvalencia.website/ http://reputation-management.site/ http://pitesti.online/ http://tobuweb.space/ http://ancientmariners.online/ http://betwsycoednet.online http://kuzin.website http://kundaliniyoga.tech http://localpay.tech http://my-iframe.online http://getimov.xyz/ http://ooviv.xyz/ http://mirei.xyz http://toblek.xyz/ http://sevenwonders.store http://peralga.xyz/ https://texastourgear.live http://freixenet.site/influencerprogramme/ http://timvanorden.store/ http://rhee.tech/ http://f3group.online/ https://www.hlungomare.store/ https://www.lungomarebikehotel.store http://www.lvmaimai.xyz/ https://sozdanie.site/ http://agens128.site/ http://troubadourtunes.online/ http://ruirui.store/ http://www.foamhands.store/ http://www.i-obchody.info/ http://naughtyrobot.digital/ https://www.webb-dev.co.uk/ https://waytowhatsnext.com/ https://www.bilanmagazine.com/ https://www.web-mediaplacing.com/ https://fitnessblog.fr/ https://cbd-huile-blog.fr/ https://www.laptopkerja.com/ https://www.espresso-international.eu/ https://www.espresso-international.be https://www.espresso-international.gr https://besthotels.wiki https://www.cherada.net/opus/verified-gmail-accounts https://www.cherada.net/opus/10000-visitas-a-tu-video-en-youtube https://www.cherada.net/opus/100-backlinks-en-comentarios-de-blog-a-la-medida https://redwinecasino.com/ https://sharkcasinogames.com/ https://redbettips.com/ https://windows11iso.com/ In collect_register() function of arc-linux-tdep.c, the "eret" (exception return) register value is not being reported correctly. Background: https://komiya-dental.com/ When asked for the "pc" value, we have to update the "eret" register with GDB's STOP_PC. The "eret" instructs the kernel code where to jump back when an instruction has stopped due to a breakpoint. This is how collect_register() is doing so: --------------8<-------------- if (regnum == gdbarch_pc_regnum (gdbarch)) regnum = ARC_ERET_REGNUM; regcache->raw_collect (regnum, buf + arc_linux_core_reg_offsets[regnum]); -------------->8-------------- Root cause: http://www.iu-bloomington.com/ Although this is using the correct offset (ERET register's), it is also changing the REGNUM itself. Therefore, raw_collect (regnum, ...) is not reading from "pc" anymore. Consequence: This bug affects the "native ARC gdb" badly and causes kernel code to jump to addresses after the breakpoint and not executing the "breakpoint"ed instructions at all. That "native ARC gdb" feature is not upstream yet and is in review at the time of writing [1]. https://www.webb-dev.co.uk/ In collect_register() function of arc-linux-tdep.c, the "eret" (exception return) register value is not being reported correctly. Background: https://waytowhatsnext.com/ When asked for the "pc" value, we have to update the "eret" register with GDB's STOP_PC. The "eret" instructs the kernel code where to jump back when an instruction has stopped due to a breakpoint. This is how collect_register() is doing so: --------------8<-------------- if (regnum == gdbarch_pc_regnum (gdbarch)) regnum = ARC_ERET_REGNUM; http://www.acpirateradio.co.uk/ regcache->raw_collect (regnum, buf + arc_linux_core_reg_offsets[regnum]); -------------->8-------------- Root cause: Although this is using the correct offset (ERET register's), it is also changing the REGNUM itself. Therefore, raw_collect (regnum, ...) is not reading from "pc" anymore. http://www.logoarts.co.uk/ Consequence: This bug affects the "native ARC gdb" badly and causes kernel code to jump to addresses after the breakpoint and not executing the "breakpoint"ed instructions at all. That "native ARC gdb" feature is not upstream yet and is in review at the time of writing [1]. In collect_register() function of arc-linux-tdep.c, the "eret" http://www.slipstone.co.uk/ (exception return) register value is not being reported correctly. Background: When asked for the "pc" value, http://embermanchester.uk/ we have to update the "eret" register with GDB's STOP_PC. The "eret" instructs the kernel code where to jump back when an instruction has stopped due to a breakpoint. This is how collect_register() is doing so: http://connstr.net/ --------------8<-------------- if (regnum == gdbarch_pc_regnum (gdbarch)) http://joerg.li/ regnum = ARC_ERET_REGNUM; regcache->raw_collect (regnum, buf + arc_linux_core_reg_offsets[regnum]); -------------->8-------------- http://www.jopspeech.com/ Root cause: Although this is using the correct offset (ERET register's), it is also changing the REGNUM itself. Therefore, raw_collect (regnum, ...) is not reading from "pc" anymore. http://www.wearelondonmade.com/ Consequence: This bug affects the "native ARC gdb" badly and causes kernel code to jump to addresses http://www.compilatori.com/ after the breakpoint and not executing the "breakpoint"ed instructions at all. That "native ARC gdb" feature is not upstream yet and is in review at the time of writing [1]. http://www-look-4.com/ http://www.acpirateradio.co.uk/category/computers/ http://www.logoarts.co.uk/category/travel/ http://embermanchester.uk/category/travel/ http://connstr.net/computers/latest-car-deals/ http://www.jopspeech.com/category/travel/ http://www.wearelondonmade.com/category/property/ http://www.compilatori.com/travel/london/ "The strncat() function shall append not more than n bytes (a null byte and bytes that follow it are not appended) from the array pointed to by s2 to the end of the string pointed to by s1." http://www-look-4.com/category/technology/ The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), https://komiya-dental.com/health/healthy-foods/ and both source and destination do not overlap (overlapping depends on the source and destination layout, not on the "n" value) http://www.iu-bloomington.com/computers/invisible-with-vpn/ However, it seems that the optimized strncat version of the GLIBC behaves incorrectly, when using this value. https://waytowhatsnext.com/sports/navona/ "The strncat() function shall append not more than n bytes (a null byte and bytes that follow it are not appended) from the array pointed to by s2 to the end of the string pointed to by s1." https://www.webb-dev.co.uk/sports/sports-and-health/ The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), and both source and destination http://www.wearelondonmade.com/category/tech/ do not overlap (overlapping depends on the source and destination layout, not on the "n" value) However, it seems that the optimized strncat version of the GLIBC behaves incorrectly, when using this value. http://www.jopspeech.com/category/technology/ "The strncat() function shall append not more than n bytes (a null byte and bytes that follow it are not appended) from the array pointed to by s2 to the end of the string pointed to by s1." http://joerg.li/category/technology/ The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), and both source and destination do not http://connstr.net/category/technology/ overlap (overlapping depends on the source and destination layout, not on the "n" value) However, it seems that the optimized strncat version of the GLIBC behaves incorrectly, when using this value. http://embermanchester.uk/category/technology/ "The strncat() function shall append not more than n bytes (a null byte and bytes that follow it are not appended) from the array pointed to by s2 to the end of the string pointed to by s1." http://www.slipstone.co.uk/category/technology/ The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), and both source and destination do not overlap http://www.logoarts.co.uk/category/technology/ (overlapping depends on the source and destination layout, not on the "n" value) However, it seems that the optimized strncat version of the GLIBC behaves incorrectly, when using this value. http://www.acpirateradio.co.uk/category/technology/ "The strncat() function shall append not more than n bytes (a null byte and bytes that follow it are not appended) from the array pointed to by s2 to the end of the string pointed to by s1." http://www.compilatori.com/category/technology/ The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), and both source and destination do not overlap (overlapping depends on the source and destination layout, not on the "n" value) However, it seems that the optimized strncat version of the GLIBC behaves incorrectly, when using this value. The wording imply that the third "n" argument is an additional boundary limit, not the destination buffer capacity (ie. the destination buffer is not implicitly SIZE_MAX), and both source and destination do not overlap (overlapping depends on the source and destination layout, not on the "n" value) https://www.worcesterroofingandsiding.com |