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authorAndrea Righi <andrea.righi@canonical.com>2023-08-30 17:58:20 +0200
committerLuis Chamberlain <mcgrof@kernel.org>2023-11-01 13:07:08 -0700
commit3737df782c740b944912ed93420c57344b1cf864 (patch)
treef2a89cbfcfec41c9b0aacdf7953f5eea87d25952 /kernel/module
parent62eedac264159690b4fed78aeec4d3623ce253b7 (diff)
module/decompress: use vmalloc() for gzip decompression workspace
Use a similar approach as commit a419beac4a07 ("module/decompress: use vmalloc() for zstd decompression workspace") and replace kmalloc() with vmalloc() also for the gzip module decompression workspace. In this case the workspace is represented by struct inflate_workspace that can be fairly large for kmalloc() and it can potentially lead to allocation errors on certain systems: $ pahole inflate_workspace struct inflate_workspace { struct inflate_state inflate_state; /* 0 9544 */ /* --- cacheline 149 boundary (9536 bytes) was 8 bytes ago --- */ unsigned char working_window[32768]; /* 9544 32768 */ /* size: 42312, cachelines: 662, members: 2 */ /* last cacheline: 8 bytes */ }; Considering that there is no need to use continuous physical memory, simply switch to vmalloc() to provide a more reliable in-kernel module decompression. Fixes: b1ae6dc41eaa ("module: add in-kernel support for decompressing") Signed-off-by: Andrea Righi <andrea.righi@canonical.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'kernel/module')
-rw-r--r--kernel/module/decompress.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/module/decompress.c b/kernel/module/decompress.c
index 87440f714c0c..4156d59be440 100644
--- a/kernel/module/decompress.c
+++ b/kernel/module/decompress.c
@@ -100,7 +100,7 @@ static ssize_t module_gzip_decompress(struct load_info *info,
s.next_in = buf + gzip_hdr_len;
s.avail_in = size - gzip_hdr_len;
- s.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
+ s.workspace = vmalloc(zlib_inflate_workspacesize());
if (!s.workspace)
return -ENOMEM;
@@ -138,7 +138,7 @@ static ssize_t module_gzip_decompress(struct load_info *info,
out_inflate_end:
zlib_inflateEnd(&s);
out:
- kfree(s.workspace);
+ vfree(s.workspace);
return retval;
}
#elif defined(CONFIG_MODULE_COMPRESS_XZ)