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efi_loader: variable: attributes may not be changed if a variable exists

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If a variable already exists, efi_set_variable() should not change
the variable's attributes. This patch enforces it.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
AKASHI Takahiro 2019-05-24 15:59:03 +09:00 • committed by Heinrich Schuchardt
parent dbebae5ec7
commit a2c6983740
1 changed files with 11 additions and 2 deletions
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13
lib/efi_loader/efi_variable.c
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@ -451,12 +451,21 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
if (val) {
parse_attr(val, &attr);
/* We should not free val */
val = NULL;
if (attr & READ_ONLY) {
/* We should not free val */
val = NULL;
ret = EFI_WRITE_PROTECTED;
goto out;
}
/*
* attributes won't be changed
* TODO: take care of APPEND_WRITE once supported
*/
if (attr != attributes) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
}
val = malloc(2 * data_size + strlen("{ro,run,boot}(blob)") + 1);