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author | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-12-06 05:06:57 +0100 |
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committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-12-06 05:10:28 +0100 |
commit | 9e406b1141da2d93b73428910f2504850631a3ee (patch) | |
tree | fd8dd831b498f1e054a34e1f7497ca54dff48e65 /src/boot | |
parent | journald: fix build error (diff) | |
download | systemd-9e406b1141da2d93b73428910f2504850631a3ee.tar.xz systemd-9e406b1141da2d93b73428910f2504850631a3ee.zip |
boot: cleanups for efivar_get() and friends
- rename function arguments for storing results, and support the case
that they are NULL,
- return earlier on error,
- always validate read size in efivar_get_uint32_le() and efivar_get_uint64_le().
Diffstat (limited to 'src/boot')
-rw-r--r-- | src/boot/efi/util.c | 63 | ||||
-rw-r--r-- | src/boot/efi/util.h | 6 |
2 files changed, 37 insertions, 32 deletions
diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c index f9aeeb4833..1f07fbc38c 100644 --- a/src/boot/efi/util.c +++ b/src/boot/efi/util.c @@ -91,7 +91,7 @@ EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, const char16_t *name, ui return efivar_set_raw(vendor, name, buf, sizeof(buf), flags); } -EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **value) { +EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **ret) { _cleanup_free_ char16_t *buf = NULL; EFI_STATUS err; char16_t *val; @@ -108,12 +108,12 @@ EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **v if ((size % sizeof(char16_t)) != 0) return EFI_INVALID_PARAMETER; - if (!value) + if (!ret) return EFI_SUCCESS; /* Return buffer directly if it happens to be NUL terminated already */ if (size >= sizeof(char16_t) && buf[size / sizeof(char16_t) - 1] == 0) { - *value = TAKE_PTR(buf); + *ret = TAKE_PTR(buf); return EFI_SUCCESS; } @@ -123,18 +123,17 @@ EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **v memcpy(val, buf, size); val[size / sizeof(char16_t) - 1] = 0; /* NUL terminate */ - *value = val; + *ret = val; return EFI_SUCCESS; } -EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, UINTN *i) { +EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, UINTN *ret) { _cleanup_free_ char16_t *val = NULL; EFI_STATUS err; uint64_t u; assert(vendor); assert(name); - assert(i); err = efivar_get(vendor, name, &val); if (err != EFI_SUCCESS) @@ -143,7 +142,8 @@ EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, if (!parse_number16(val, &u, NULL) || u > UINTN_MAX) return EFI_INVALID_PARAMETER; - *i = u; + if (ret) + *ret = u; return EFI_SUCCESS; } @@ -156,15 +156,17 @@ EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const char16_t *name, ui assert(name); err = efivar_get_raw(vendor, name, &buf, &size); - if (err == EFI_SUCCESS && ret) { - if (size != sizeof(uint32_t)) - return EFI_BUFFER_TOO_SMALL; + if (err != EFI_SUCCESS) + return err; + if (size != sizeof(uint32_t)) + return EFI_BUFFER_TOO_SMALL; + + if (ret) *ret = (uint32_t) buf[0] << 0U | (uint32_t) buf[1] << 8U | (uint32_t) buf[2] << 16U | (uint32_t) buf[3] << 24U; - } - return err; + return EFI_SUCCESS; } EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const char16_t *name, uint64_t *ret) { @@ -176,19 +178,21 @@ EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const char16_t *name, ui assert(name); err = efivar_get_raw(vendor, name, &buf, &size); - if (err == EFI_SUCCESS && ret) { - if (size != sizeof(uint64_t)) - return EFI_BUFFER_TOO_SMALL; + if (err != EFI_SUCCESS) + return err; + + if (size != sizeof(uint64_t)) + return EFI_BUFFER_TOO_SMALL; + if (ret) *ret = (uint64_t) buf[0] << 0U | (uint64_t) buf[1] << 8U | (uint64_t) buf[2] << 16U | (uint64_t) buf[3] << 24U | (uint64_t) buf[4] << 32U | (uint64_t) buf[5] << 40U | (uint64_t) buf[6] << 48U | (uint64_t) buf[7] << 56U; - } - return err; + return EFI_SUCCESS; } -EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **buffer, UINTN *size) { +EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **ret, UINTN *ret_size) { _cleanup_free_ char *buf = NULL; UINTN l; EFI_STATUS err; @@ -200,16 +204,15 @@ EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **b buf = xmalloc(l); err = RT->GetVariable((char16_t *) name, (EFI_GUID *) vendor, NULL, &l, buf); - if (err == EFI_SUCCESS) { - - if (buffer) - *buffer = TAKE_PTR(buf); + if (err != EFI_SUCCESS) + return err; - if (size) - *size = l; - } + if (ret) + *ret = TAKE_PTR(buf); + if (ret_size) + *ret_size = l; - return err; + return EFI_SUCCESS; } EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const char16_t *name, bool *ret) { @@ -219,13 +222,15 @@ EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const char16_t *name, b assert(vendor); assert(name); - assert(ret); err = efivar_get_raw(vendor, name, &b, &size); - if (err == EFI_SUCCESS) + if (err != EFI_SUCCESS) + return err; + + if (ret) *ret = *b > 0; - return err; + return EFI_SUCCESS; } void efivar_set_time_usec(const EFI_GUID *vendor, const char16_t *name, uint64_t usec) { diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h index 08f732f484..fb525ba636 100644 --- a/src/boot/efi/util.h +++ b/src/boot/efi/util.h @@ -130,9 +130,9 @@ EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, const char16_t *NAME, ui EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, const char16_t *name, uint64_t value, uint32_t flags); void efivar_set_time_usec(const EFI_GUID *vendor, const char16_t *name, uint64_t usec); -EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **value); -EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **buffer, UINTN *size); -EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, UINTN *i); +EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **ret); +EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **ret, UINTN *ret_size); +EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, UINTN *ret); EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const char16_t *name, uint32_t *ret); EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const char16_t *name, uint64_t *ret); EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const char16_t *name, bool *ret); |