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Re: [PATCH 0/9] reducing memory allocations for v2 servers

From
Jeff King <peff@peff.net>
Date
Sep 14, 2021, 18:38 UTC
Message-ID
<YUDsJNV2mvKl5g29@coredump.intra.peff.net>
In-Reply-To
<xmqqy27z11gn.fsf@gitster.g>
On Tue, Sep 14, 2021 at 11:00:56AM -0700, Junio C Hamano wrote:
Show 10 quoted lines
> Jeff King <peff@peff.net> writes:
> 
> > While looking at [1], I noticed that v2 servers will read a few bits of
> > client input into strvecs. Even though we expect these to be small-ish,
> > there's nothing preventing a client from sending us a bunch of junk and
> > wasting memory.
> 
> The title of the topic says "reducing", but it smells more to me
> like this is about "limiting" allocations to protect ourselves.  Am
> I reading the series correctly?

Yeah, I think "limiting" is probably a better word. We will still allocate for ref-prefix, of course, but we'll limit the number of allocations. We did "reduce" the number of spots that allocate, since capabilities no longer do so. :)

But I think your understanding of the series is correct.
-Peff
Previous: Junio C HamanoNext: Jeff King
Message 30 of 77 in “reducing memory allocations for v2 servers”
  1. 0/9 reducing memory allocations for v2 serversJeff King, Sep 14, 2021
  2. 1/9 serve: rename is_command() to parse_command()Jeff King, Sep 14, 2021
  3. 2/9 serve: return capability "value" from get_capability()Jeff King, Sep 14, 2021
  4. 3/9 serve: add "receive" method for v2 capabilities tableJeff King, Sep 14, 2021
  5. 4/9 serve: provide "receive" function for object-format capabilityJeff King, Sep 14, 2021
  6. Martin ÅgrenSep 14, 2021
  7. 5/9 serve: provide "receive" function for session-id capabilityJeff King, Sep 14, 2021
  8. Taylor BlauSep 14, 2021
  9. Jeff KingSep 14, 2021
  10. Taylor BlauSep 14, 2021
  11. Martin ÅgrenSep 14, 2021
  12. Jeff KingSep 14, 2021
  13. 6/9 serve: drop "keys" strvecJeff King, Sep 14, 2021
  14. Taylor BlauSep 14, 2021
  15. Jeff KingSep 14, 2021
  16. 7/9 ls-refs: ignore very long ref-prefix countsJeff King, Sep 14, 2021
  17. Taylor BlauSep 14, 2021
  18. Jeff KingSep 14, 2021
  19. Jeff KingSep 14, 2021
  20. Martin ÅgrenSep 14, 2021
  21. Jeff KingSep 14, 2021
  22. Jeff KingSep 14, 2021
  23. Taylor BlauSep 14, 2021
  24. Jeff KingSep 14, 2021
  25. 8/9 serve: reject bogus v2 "command=ls-refs=foo"Jeff King, Sep 14, 2021
  26. Taylor BlauSep 14, 2021
  27. 9/9 serve: reject commands used as capabilitiesJeff King, Sep 14, 2021
  28. Taylor BlauSep 14, 2021
  29. Junio C HamanoSep 14, 2021
  30. Jeff KingSep 14, 2021
  31. 0/11 limit memory allocations for v2 serversJeff King, Sep 14, 2021
  32. 01/11 serve: rename is_command() to parse_command()Jeff King, Sep 14, 2021
  33. 02/11 serve: return capability "value" from get_capability()Jeff King, Sep 14, 2021
  34. 03/11 serve: add "receive" method for v2 capabilities tableJeff King, Sep 14, 2021
  35. Ævar Arnfjörð BjarmasonSep 15, 2021
  36. Jeff KingSep 15, 2021
  37. Junio C HamanoSep 15, 2021
  38. Jeff KingSep 15, 2021
  39. 04/11 serve: provide "receive" function for object-format capabilityJeff King, Sep 14, 2021
  40. Junio C HamanoSep 15, 2021
  41. 05/11 serve: provide "receive" function for session-id capabilityJeff King, Sep 14, 2021
  42. Junio C HamanoSep 15, 2021
  43. 07/11 ls-refs: ignore very long ref-prefix countsJeff King, Sep 14, 2021
  44. Taylor BlauSep 15, 2021
  45. Jeff KingSep 15, 2021
  46. Eric SunshineSep 15, 2021
  47. Jeff KingSep 15, 2021
  48. 06/11 serve: drop "keys" strvecJeff King, Sep 14, 2021
  49. Junio C HamanoSep 15, 2021
  50. 08/11 docs/protocol-v2: clarify some ls-refs ref-prefix detailsJeff King, Sep 14, 2021
  51. 09/11 serve: reject bogus v2 "command=ls-refs=foo"Jeff King, Sep 14, 2021
  52. Ævar Arnfjörð BjarmasonSep 15, 2021
  53. Jeff KingSep 15, 2021
  54. Eric SunshineSep 15, 2021
  55. Jeff KingSep 15, 2021
  56. Junio C HamanoSep 15, 2021
  57. Jeff KingSep 15, 2021
  58. 10/11 serve: reject commands used as capabilitiesJeff King, Sep 14, 2021
  59. 11/11 ls-refs: reject unknown argumentsJeff King, Sep 14, 2021
  60. Ævar Arnfjörð BjarmasonSep 15, 2021
  61. Jeff KingSep 15, 2021
  62. Taylor BlauSep 15, 2021
  63. Jeff KingSep 15, 2021
  64. 0/11 limit memory allocations for v2 serversJeff King, Sep 15, 2021
  65. 01/11 serve: rename is_command() to parse_command()Jeff King, Sep 15, 2021
  66. 02/11 serve: return capability "value" from get_capability()Jeff King, Sep 15, 2021
  67. 03/11 serve: add "receive" method for v2 capabilities tableJeff King, Sep 15, 2021
  68. 04/11 serve: provide "receive" function for object-format capabilityJeff King, Sep 15, 2021
  69. 05/11 serve: provide "receive" function for session-id capabilityJeff King, Sep 15, 2021
  70. 06/11 serve: drop "keys" strvecJeff King, Sep 15, 2021
  71. 07/11 ls-refs: ignore very long ref-prefix countsJeff King, Sep 15, 2021
  72. 08/11 docs/protocol-v2: clarify some ls-refs ref-prefix detailsJeff King, Sep 15, 2021
  73. 09/11 serve: reject bogus v2 "command=ls-refs=foo"Jeff King, Sep 15, 2021
  74. 10/11 serve: reject commands used as capabilitiesJeff King, Sep 15, 2021
  75. 11/11 ls-refs: reject unknown argumentsJeff King, Sep 15, 2021
  76. Ævar Arnfjörð BjarmasonSep 15, 2021
  77. Jeff KingSep 15, 2021

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