From: Eric Biggers <ebiggers@xxxxxxxxxx> When keyctl_read() is passed a buffer that is too small, the behavior is inconsistent. Some key types will fill as much of the buffer as possible, while others won't copy anything. Moreover, the in-kernel documentation contradicted the man page on this point. Update the man page to say that this point is unspecified. Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> --- man/keyctl_read.3 | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/man/keyctl_read.3 b/man/keyctl_read.3 index 25821ad..852bc05 100644 --- a/man/keyctl_read.3 +++ b/man/keyctl_read.3 @@ -33,8 +33,8 @@ permission on a key to be able to read it. and .I buflen specify the buffer into which the payload data will be placed. If the buffer -is too small, the full size of the payload will be returned and no copy will -take place. +is too small, then the full size of the payload will be returned, and the +contents of the buffer may be overwritten in some undefined way. .P .BR keyctl_read_alloc () is similar to @@ -62,8 +62,8 @@ though the byte-ordering is as appropriate for the kernel. On success .BR keyctl_read () returns the amount of data placed into the buffer. If the buffer was too -small, then the size of buffer required will be returned, but no data will be -transferred. +small, then the size of buffer required will be returned, and the contents of +the buffer may have been overwritten in some undefined way. .P On success .BR keyctl_read_alloc () -- 2.15.0.403.gc27cc4dac6-goog -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
