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nuageinit: Add guards against empty user data

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Add guards against attempting to process a user data file with an empty
first line or contents.

PR:		290395
Reviewed by:	bapt (earlier), dtxdf, markj
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D53239
This commit is contained in:
Jose Luis Duran
2025-10-21 13:11:50 +00:00
parent 81af04b081
commit 57d25b6333
1 changed files with 8 additions and 0 deletions
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libexec/nuageinit/nuageinit
+8
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@@ -663,8 +663,16 @@ if not f then
os.exit(0) os.exit(0)
end end
local line = f:read("*l") local line = f:read("*l")
if not line or #string.gsub(line, "^%s*(.-)%s*$", "%1") == 0 then
f:close()
os.exit(0)
end
if citype ~= "postnet" then if citype ~= "postnet" then
local content = f:read("*a") local content = f:read("*a")
if not content or #string.gsub(content, "^%s*(.-)%s*$", "%1") == 0 then
f:close()
os.exit(0)
end
nuage.mkdir_p(root .. "/var/cache/nuageinit") nuage.mkdir_p(root .. "/var/cache/nuageinit")
local tof = assert(io.open(root .. "/var/cache/nuageinit/user_data", "w")) local tof = assert(io.open(root .. "/var/cache/nuageinit/user_data", "w"))
tof:write(line .. "\n" .. content) tof:write(line .. "\n" .. content)