diff options
author | Lennart Poettering <lennart@poettering.net> | 2016-01-26 19:02:12 +0100 |
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committer | Sven Eden <yamakuzure@gmx.net> | 2017-05-17 15:22:15 +0200 |
commit | 69db37b5fbcf6d4d26839860d5e067a45f3f7023 (patch) | |
tree | 220dc2633f4555d3d0be785fcca398d3820ac2ad /src/basic/io-util.h | |
parent | 7634579fb338f996cecb6f49b1183e0a4e491617 (diff) |
machined: add early checks for unrealistically large image/pool sizes
Diffstat (limited to 'src/basic/io-util.h')
-rw-r--r-- | src/basic/io-util.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/basic/io-util.h b/src/basic/io-util.h index 5f77a556c..7d0d2bd81 100644 --- a/src/basic/io-util.h +++ b/src/basic/io-util.h @@ -77,3 +77,21 @@ static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) { return k; } + +static inline bool FILE_SIZE_VALID(uint64_t l) { + /* ftruncate() and friends take an unsigned file size, but actually cannot deal with file sizes larger than + * 2^63 since the kernel internally handles it as signed value. This call allows checking for this early. */ + + return (l >> 63) == 0; +} + +static inline bool FILE_SIZE_VALID_OR_INFINITY(uint64_t l) { + + /* Same as above, but allows one extra value: -1 as indication for infinity. */ + + if (l == (uint64_t) -1) + return true; + + return FILE_SIZE_VALID(l); + +} |