diff options
author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2019-09-06 15:09:52 +0900 |
---|---|---|
committer | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2019-09-20 20:09:18 +0200 |
commit | 6d2f27c5fd60c1310884c873350f1edc7d831bb0 (patch) | |
tree | 5c76f321f07406d693369ddf45332a5f0d2da88c /lib/efi_loader/efi_variable.c | |
parent | 7dc10c933c5d95d173dd17c8c69be8585146c4c8 (diff) |
efi_loader: variable: support APPEND_WRITE
If EFI_VARIABLE_APPEND_WRITE is specified in attributes at
efi_set_variable(), specified data will be appended to the variable's
original value. Attributes other than APPEND_WRITE should not be
modified.
With this patch, APPEND_WRITE test in 'variables' selftest will pass.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Diffstat (limited to 'lib/efi_loader/efi_variable.c')
-rw-r--r-- | lib/efi_loader/efi_variable.c | 70 |
1 files changed, 44 insertions, 26 deletions
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c index 6687b69a40..48ee255f87 100644 --- a/lib/efi_loader/efi_variable.c +++ b/lib/efi_loader/efi_variable.c @@ -424,17 +424,17 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name, efi_uintn_t data_size, const void *data) { char *native_name = NULL, *val = NULL, *s; + const char *old_val; + size_t old_size; efi_status_t ret = EFI_SUCCESS; u32 attr; EFI_ENTRY("\"%ls\" %pUl %x %zu %p", variable_name, vendor, attributes, data_size, data); - /* TODO: implement APPEND_WRITE */ if (!variable_name || !*variable_name || !vendor || ((attributes & EFI_VARIABLE_RUNTIME_ACCESS) && - !(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)) || - (attributes & EFI_VARIABLE_APPEND_WRITE)) { + !(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS))) { ret = EFI_INVALID_PARAMETER; goto out; } @@ -445,35 +445,51 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name, #define ACCESS_ATTR (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS) - if ((data_size == 0) || !(attributes & ACCESS_ATTR)) { - /* delete the variable: */ - env_set(native_name, NULL); - ret = EFI_SUCCESS; - goto out; - } + old_val = env_get(native_name); + if (old_val) { + old_val = parse_attr(old_val, &attr); - val = env_get(native_name); - if (val) { - parse_attr(val, &attr); - - /* We should not free val */ - val = NULL; + /* check read-only first */ if (attr & READ_ONLY) { ret = EFI_WRITE_PROTECTED; goto out; } - /* - * attributes won't be changed - * TODO: take care of APPEND_WRITE once supported - */ - if (attr != attributes) { + if ((data_size == 0) || !(attributes & ACCESS_ATTR)) { + /* delete the variable: */ + env_set(native_name, NULL); + ret = EFI_SUCCESS; + goto out; + } + + /* attributes won't be changed */ + if (attr != (attributes & ~EFI_VARIABLE_APPEND_WRITE)) { ret = EFI_INVALID_PARAMETER; goto out; } + + if (attributes & EFI_VARIABLE_APPEND_WRITE) { + if (!prefix(old_val, "(blob)")) { + return EFI_DEVICE_ERROR; + goto out; + } + old_size = strlen(old_val); + } else { + old_size = 0; + } + } else { + if ((data_size == 0) || !(attributes & ACCESS_ATTR) || + (attributes & EFI_VARIABLE_APPEND_WRITE)) { + /* delete, but nothing to do */ + ret = EFI_NOT_FOUND; + goto out; + } + + old_size = 0; } - val = malloc(2 * data_size + strlen("{ro,run,boot,nv}(blob)") + 1); + val = malloc(old_size + 2 * data_size + + strlen("{ro,run,boot,nv}(blob)") + 1); if (!val) { ret = EFI_OUT_OF_RESOURCES; goto out; @@ -481,10 +497,7 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name, s = val; - /* - * store attributes - * TODO: several attributes are not supported - */ + /* store attributes */ attributes &= (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS); @@ -505,8 +518,13 @@ efi_status_t EFIAPI efi_set_variable(u16 *variable_name, } s += sprintf(s, "}"); + if (old_size) + /* APPEND_WRITE */ + s += sprintf(s, old_val); + else + s += sprintf(s, "(blob)"); + /* store payload: */ - s += sprintf(s, "(blob)"); s = bin2hex(s, data, data_size); *s = '\0'; |