Re: [PATCH] ShellPkg/set: Fix EfiShellSetEnv to use case sensitive compare

["Carsey, Jaben" <jaben.carsey@intel.com>]

Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

> -----Original Message-----
> From: Ni, Ruiyu
> Sent: Tuesday, August 07, 2018 2:14 AM
> To: edk2-devel@lists.01.org
> Cc: Carsey, Jaben <jaben.carsey@intel.com>; Jim Dailey
> <jim_dailey@dell.com>
> Subject: [PATCH] ShellPkg/set: Fix EfiShellSetEnv to use case sensitive
> compare
> Importance: High
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=777
> 
> Per Shell spec, the environment variable has a case-sensitive name.
> But today's implementation of EfiShellSetEnv() compares the
> environment variable name case insensitively, which causes variable
> like "CWD" cannot be set due to "cwd" is pre-defined variable.
> 
> The patch fixes this issue.
> 
> The EfiShellGetEnv() doesn't have such issue because it will
> call into ShellFindEnvVarInList() which uses StrCmp().
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
> Cc: Jaben Carsey <jaben.carsey@intel.com>
> Cc: Jim Dailey <jim_dailey@dell.com>
> ---
>  ShellPkg/Application/Shell/ShellProtocol.c | 39 +++++++-----------------------
>  1 file changed, 9 insertions(+), 30 deletions(-)
> 
> diff --git a/ShellPkg/Application/Shell/ShellProtocol.c
> b/ShellPkg/Application/Shell/ShellProtocol.c
> index f2ca2029e3..767cbc99a0 100644
> --- a/ShellPkg/Application/Shell/ShellProtocol.c
> +++ b/ShellPkg/Application/Shell/ShellProtocol.c
> @@ -2924,36 +2924,15 @@ EfiShellSetEnv(
>    //
>    // Make sure we dont 'set' a predefined read only variable
>    //
> -  if (gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"cwd") == 0
> -    ||gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"Lasterror") == 0
> -    ||gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"profiles") == 0
> -    ||gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"uefishellsupport") == 0
> -    ||gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"uefishellversion") == 0
> -    ||gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        L"uefiversion") == 0
> -    ||(!ShellInfoObject.ShellInitSettings.BitUnion.Bits.NoNest &&
> -      gUnicodeCollation->StriColl(
> -        gUnicodeCollation,
> -        (CHAR16*)Name,
> -        (CHAR16*)mNoNestingEnvVarName) == 0)
> -       ){
> +  if ((StrCmp (Name, L"cwd") == 0) ||
> +      (StrCmp (Name, L"Lasterror") == 0) ||
> +      (StrCmp (Name, L"profiles") == 0) ||
> +      (StrCmp (Name, L"uefishellsupport") == 0) ||
> +      (StrCmp (Name, L"uefishellversion") == 0) ||
> +      (StrCmp (Name, L"uefiversion") == 0) ||
> +      (!ShellInfoObject.ShellInitSettings.BitUnion.Bits.NoNest &&
> +       StrCmp (Name, mNoNestingEnvVarName) == 0)
> +     ) {
>      return (EFI_INVALID_PARAMETER);
>    }
>    return (InternalEfiShellSetEnv(Name, Value, Volatile));
> --
> 2.16.1.windows.1