Commit 96eda741 authored by Anisse Astier's avatar Anisse Astier Committed by Will Deacon
Browse files

builtin-run: Fix warning when resolving path

GCC 8.2 gives this warning:

builtin-run.c: In function ‘kvm_run_write_sandbox_cmd.isra.1’:
builtin-run.c:417:28: error: ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4091 [-Werror=format-truncation=]
   snprintf(dst, len, "/host%s", resolved_path);
                            ^~   ~~~~~~~~~~~~~

It's because it understands that len is PATH_MAX, the same as
resolved_path's size. This patch handles the case where the string is
truncated, and fixes the warning.

Reviewed-by: Andre Przywara's avatarAndre Przywara <>
Signed-off-by: default avatarAnisse Astier <>
Signed-off-by: default avatarWill Deacon <>
parent 2f61a442
......@@ -414,7 +414,9 @@ static void resolve_program(const char *src, char *dst, size_t len)
if (!realpath(src, resolved_path))
die("Unable to resolve program %s: %s\n", src, strerror(errno));
snprintf(dst, len, "/host%s", resolved_path);
if (snprintf(dst, len, "/host%s", resolved_path) >= (int)len)
die("Pathname too long: %s -> %s\n", src, resolved_path);
} else
strncpy(dst, src, len);
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