Ticket #7037 (closed bug: fixed)

Opened 11 months ago

Last modified 11 months ago

setProgName() crashes when argv[0] == NULL

Reported by: shachaf Owned by: simonmar
Priority: high Milestone: 7.6.1
Component: Runtime System Version: 7.4.2
Keywords: Cc:
Operating System: Unknown/Multiple Architecture: Unknown/Multiple
Type of failure: Runtime crash Difficulty: Unknown
Test Case: rts/T7037 Blocked By:
Blocking: Related Tickets:

Description

C89 allows argc to be 0, in which case argv[0] is NULL. This can happen in practice in Linux+glibc with execve(program, {NULL}, ...);.

The RTS assumes that argv[0] always points to a valid string: void setProgName(char *argv[]) { char *last_slash; if ( (last_slash = (char *) strrchr(argv[0], '/')) != NULL ) { ... } else { ... } }.

This means that any GHC-compiled program can be made to segfault with execl("./ghc-compiled-program", NULL);.

Change History

Changed 11 months ago by simonmar

  • owner set to simonmar
  • difficulty set to Unknown
  • priority changed from normal to high
  • milestone set to 7.6.1

Changed 11 months ago by marlowsd@…

commit 0d19922acd724991b7b97871b1404f3db5058b49 

Author: Simon Marlow <marlowsd@gmail.com>
Date:   Mon Jul 2 15:55:20 2012 +0100

    don't crash if argv[0] == NULL (#7037)

 rts/RtsFlags.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

Changed 11 months ago by simonmar

  • status changed from new to closed
  • testcase set to rts/T7037
  • resolution set to fixed

Changed 11 months ago by marlowsd@…

commit 99fd2469fba1a38b2a65b4694f337d92e559df01 

Merge: d260d91... 0d19922...
Author: Simon Marlow <marlowsd@gmail.com>
Date:   Wed Jul 4 10:34:48 2012 +0100

    Merge remote-tracking branch 'origin/master' into newcg
    
    * origin/master: (756 commits)
      don't crash if argv[0] == NULL (#7037)
      -package P was loading all versions of P in GHCi (#7030)
      Add a Note, copying text from #2437
      improve the --help docs a bit (#7008)
      Copy Data.HashTable's hashString into our Util module
      Build fix
      Build fixes
      Parse error: suggest brackets and indentation.
      Don't build the ghc DLL on Windows; works around trac #5987
      On Windows, detect if DLLs have too many symbols; trac #5987
      Add some more Integer rules; fixes #6111
      Fix PA dfun construction with silent superclass args
      Add silent superclass parameters to the vectoriser
      Add silent superclass parameters (again)
      Mention Generic1 in the user's guide
      Make the GHC API a little more powerful.
      tweak llvm version warning message
      New version of the patch for #5461.
      Fix Word64ToInteger conversion rule.
      Implemented feature request on reconfigurable pretty-printing in GHCi (#5461)
      ...
    
    Conflicts:
    	compiler/basicTypes/UniqSupply.lhs
    	compiler/cmm/CmmBuildInfoTables.hs
    	compiler/cmm/CmmLint.hs
    	compiler/cmm/CmmOpt.hs
    	compiler/cmm/CmmPipeline.hs
    	compiler/cmm/CmmStackLayout.hs
    	compiler/cmm/MkGraph.hs
    	compiler/cmm/OldPprCmm.hs
    	compiler/codeGen/CodeGen.lhs
    	compiler/codeGen/StgCmm.hs
    	compiler/codeGen/StgCmmBind.hs
    	compiler/codeGen/StgCmmLayout.hs
    	compiler/codeGen/StgCmmUtils.hs
    	compiler/main/CodeOutput.lhs
    	compiler/main/HscMain.hs
    	compiler/nativeGen/AsmCodeGen.lhs
    	compiler/simplStg/SimplStg.lhs

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 includes/rts/storage/InfoTables.h                  |   22 +-
 includes/rts/storage/TSO.h                         |    2 +-
 includes/stg/DLL.h                                 |   25 +-
 includes/stg/MachRegs.h                            |  209 +-
 includes/stg/MiscClosures.h                        |    2 +
 includes/stg/Types.h                               |   29 +-
 libffi/ghc.mk                                      |   11 +-
 .../Distribution/InstalledPackageInfo/Binary.hs    |    4 +-
 libraries/gen_contents_index                       |   37 +-
 mk/config.mk.in                                    |   21 +-
 mk/tree.mk                                         |    2 +-
 mk/validate-settings.mk                            |   18 +-
 packages                                           |    3 +-
 rts/Adjustor.c                                     |  477 +++--
 rts/Capability.c                                   |   50 +-
 rts/Capability.h                                   |    6 +-
 rts/ClosureFlags.c                                 |   18 +-
 rts/Disassembler.c                                 |   18 +-
 rts/FileLock.c                                     |  144 ++
 rts/FileLock.h                                     |   15 +
 rts/GetTime.h                                      |    3 +
 rts/HeapStackCheck.cmm                             |   12 +-
 rts/Interpreter.c                                  |   48 +-
 rts/Linker.c                                       |  826 +++++++-
 rts/LinkerInternals.h                              |    6 +-
 rts/PosixSource.h                                  |    4 +
 rts/Prelude.h                                      |    8 +-
 rts/PrimOps.cmm                                    |   39 +-
 rts/Printer.c                                      |   26 +-
 rts/ProfHeap.c                                     |    2 +-
 rts/RaiseAsync.c                                   |   77 +-
 rts/RetainerProfile.c                              |    4 +-
 rts/RtsDllMain.c                                   |    4 +-
 rts/RtsDllMain.h                                   |    2 +-
 rts/RtsFlags.c                                     |   20 +-
 rts/RtsMain.c                                      |    7 +-
 rts/RtsProbes.d                                    |   37 +-
 rts/RtsStartup.c                                   |   20 +-
 rts/Schedule.c                                     |   38 +-
 rts/Stats.c                                        |  163 +-
 rts/Stats.h                                        |   19 +-
 rts/StgCRun.c                                      |   87 +-
 rts/StgMiscClosures.cmm                            |    6 +-
 rts/StgStartup.cmm                                 |   12 +-
 rts/Task.c                                         |  104 +-
 rts/Task.h                                         |   30 +-
 rts/Threads.c                                      |   54 +-
 rts/Ticky.c                                        |   26 +-
 rts/Trace.c                                        |  148 ++-
 rts/Trace.h                                        |  263 ++-
 rts/eventlog/EventLog.c                            |  201 ++-
 rts/eventlog/EventLog.h                            |   34 +
 rts/ghc.mk                                         |   23 +-
 rts/hooks/MallocFail.c                             |    2 +-
 rts/hooks/OutOfHeap.c                              |    2 +-
 rts/hooks/StackOverflow.c                          |    2 +-
 rts/package.conf.in                                |    8 +-
 rts/posix/Clock.h                                  |   35 +
 rts/posix/FileLock.c                               |  145 --
 rts/posix/FileLock.h                               |   15 -
 rts/posix/GetTime.c                                |   50 +-
 rts/posix/Itimer.c                                 |   13 +-
 rts/posix/OSMem.c                                  |    2 +-
 rts/posix/OSThreads.c                              |    1 -
 rts/posix/Select.c                                 |   81 +-
 rts/posix/Select.h                                 |    2 +-
 rts/sm/Compact.c                                   |    2 +-
 rts/sm/Evac.c                                      |    2 +-
 rts/sm/GC.c                                        |   25 +-
 rts/sm/Sanity.c                                    |   18 +-
 rts/sm/Scav.c                                      |    6 +-
 rts/sm/Storage.c                                   |  178 +-
 rts/sm/Storage.h                                   |    3 +-
 rts/win32/AwaitEvent.c                             |    4 +-
 rts/win32/GetTime.c                                |   74 +-
 rts/win32/IOManager.c                              |    2 +-
 rts/win32/OSMem.c                                  |   20 +-
 rts/win32/ThrIOManager.c                           |    6 +-
 rts/win32/libHSbase.def                            |    1 -
 rts/win32/libHSghc-prim.def                        |    1 +
 rts/win32/seh_excn.c                               |    5 +-
 rules/build-package-data.mk                        |    8 +-
 rules/build-package-way.mk                         |   15 +-
 rules/build-package.mk                             |    2 +-
 rules/build-prog.mk                                |    4 +-
 rules/c-suffix-rules.mk                            |   22 +-
 rules/cmm-suffix-rules.mk                          |   12 +-
 rules/distdir-way-opts.mk                          |   46 +-
 rules/hs-suffix-rules-srcdir.mk                    |   30 +-
 rules/hs-suffix-rules.mk                           |    8 +-
 rules/package-config.mk                            |   15 +-
 rules/pretty_commands.mk                           |   13 +
 sync-all                                           |   63 +
 utils/compare_sizes/Main.hs                        |    1 -
 utils/fingerprint/fingerprint.py                   |    2 +-
 utils/genapply/GenApply.hs                         |  650 +++---
 utils/genprimopcode/Main.hs                        |  433 ++--
 utils/genprimopcode/Parser.y                       |    1 -
 utils/genprimopcode/ParserM.hs                     |    1 -
 utils/genprimopcode/Syntax.hs                      |   20 +-
 utils/ghc-cabal/Main.hs                            |   44 +-
 utils/ghc-cabal/ghc.mk                             |    4 +-
 utils/ghc-pkg/Main.hs                              |  108 +-
 utils/ghc-pkg/ghc-pkg.wrapper                      |    2 +-
 utils/ghc-pkg/ghc.mk                               |    8 +-
 utils/ghctags/Main.hs                              |   16 +-
 utils/hp2ps/Key.c                                  |   23 +-
 utils/runghc/ghc.mk                                |    3 +
 utils/runghc/runghc.hs                             |   12 +-
 validate                                           |   27 +-
 483 files changed, 33989 insertions(+), 25880 deletions(-)
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