[rlc-8/4.18.0-553.123.1.el8_10] Multiple patches tested (3 commits)#1226
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PlaidCat merged 3 commits intoMay 14, 2026
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This reverts commit f933b95.
cve CVE-2026-43284 commit-author Kuan-Ting Chen <h3xrabbit@gmail.com> commit f4c50a4 upstream-diff | While this kernel lacks MSG_SPLICE_PAGES, it still has udp_sendpage(). Upstream didn't patch udp_sendpage() because sendpage was removed entirely in favor of MSG_SPLICE_PAGES. In this kernel, splice() can still attach a page cache page to an IPv4 datagram via sendpage. Therefore, udp_sendpage() must be patched instead. IPv6 does not have MSG_SPLICE_PAGES but the __ip_addend_data() path is exercisable in ipv6/esp6.c so we're including that block. Due to missing 06b4feb ("net: group skb_shinfo zerocopy related bits together.") SKBFL_SHARED_FRAG was replaced with SKBTX_SHARED_FRAG. Also replaced flags with tx_flags. MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data(). Fixes: cac2661 ("esp4: Avoid skb_cow_data whenever possible") Fixes: 03e2a30 ("esp6: Avoid skb_cow_data whenever possible") Fixes: 7da0dde ("ip, udp: Support MSG_SPLICE_PAGES") Fixes: 6d8192b ("ip6, udp6: Support MSG_SPLICE_PAGES") Reported-by: Hyunwoo Kim <imv4bel@gmail.com> Reported-by: Kuan-Ting Chen <h3xrabbit@gmail.com> Tested-by: Hyunwoo Kim <imv4bel@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Kuan-Ting Chen <h3xrabbit@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> (cherry picked from commit f4c50a4) Signed-off-by: Shreeya Patel <spatel@ciq.com> Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>
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🤖 Validation Checks In Progress Workflow run: https://github.com/ctrliq/kernel-src-tree/actions/runs/25838069644 |
🔍 Interdiff Analysis
================================================================================
* DELTA DIFFERENCES - code changes that differ between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1347,9 +1347,6 @@
goto error;
}
- if (!(flags & MSG_NO_SHARED_FRAGS))
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
-
if (skb->ip_summed == CHECKSUM_NONE) {
__wsum csum;
csum = csum_page(page, offset, len);
################################################################################
! REJECTED PATCH2 HUNKS - could not be compared; manual review needed !
################################################################################
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1233,6 +1233,8 @@
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;
================================================================================
* CONTEXT DIFFERENCES - surrounding code differences between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1230,6 +1230,6 @@
- goto error;
- }
-
- if (skb->ip_summed == CHECKSUM_NONE) {
- __wsum csum;
- csum = csum_page(page, offset, len);
+ if (err < 0)
+ goto error;
+ copy = err;
+ wmem_alloc_delta += copy;
+ } else if (!zc) {
+ int i = skb_shinfo(skb)->nr_frags;
================================================================================
* ONLY IN PATCH2 - files not modified by patch1 *
================================================================================
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1794,6 +1794,8 @@ alloc_new_skb:
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;This is an automated interdiff check for backported commits. |
|
✅ Validation checks completed successfully View full results: https://github.com/ctrliq/kernel-src-tree/actions/runs/25838069644 |
|
🤖 Validation Checks In Progress Workflow run: https://github.com/ctrliq/kernel-src-tree/actions/runs/25856923856 |
🔍 Interdiff Analysis
================================================================================
* DELTA DIFFERENCES - code changes that differ between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1347,9 +1347,6 @@
goto error;
}
- if (!(flags & MSG_NO_SHARED_FRAGS))
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
-
if (skb->ip_summed == CHECKSUM_NONE) {
__wsum csum;
csum = csum_page(page, offset, len);
################################################################################
! REJECTED PATCH2 HUNKS - could not be compared; manual review needed !
################################################################################
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1233,6 +1233,8 @@
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;
================================================================================
* CONTEXT DIFFERENCES - surrounding code differences between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1230,6 +1230,6 @@
- goto error;
- }
-
- if (skb->ip_summed == CHECKSUM_NONE) {
- __wsum csum;
- csum = csum_page(page, offset, len);
+ if (err < 0)
+ goto error;
+ copy = err;
+ wmem_alloc_delta += copy;
+ } else if (!zc) {
+ int i = skb_shinfo(skb)->nr_frags;
================================================================================
* ONLY IN PATCH2 - files not modified by patch1 *
================================================================================
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1794,6 +1794,8 @@ alloc_new_skb:
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;This is an automated interdiff check for backported commits. |
|
✅ Validation checks completed successfully View full results: https://github.com/ctrliq/kernel-src-tree/actions/runs/25856923856 |
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🤖 Validation Checks In Progress Workflow run: https://github.com/ctrliq/kernel-src-tree/actions/runs/25858283888 |
🔍 Interdiff Analysis
================================================================================
* DELTA DIFFERENCES - code changes that differ between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1347,9 +1347,6 @@
goto error;
}
- if (!(flags & MSG_NO_SHARED_FRAGS))
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
-
if (skb->ip_summed == CHECKSUM_NONE) {
__wsum csum;
csum = csum_page(page, offset, len);
################################################################################
! REJECTED PATCH2 HUNKS - could not be compared; manual review needed !
################################################################################
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1233,6 +1233,8 @@
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;
================================================================================
* CONTEXT DIFFERENCES - surrounding code differences between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1230,6 +1230,6 @@
- goto error;
- }
-
- if (skb->ip_summed == CHECKSUM_NONE) {
- __wsum csum;
- csum = csum_page(page, offset, len);
+ if (err < 0)
+ goto error;
+ copy = err;
+ wmem_alloc_delta += copy;
+ } else if (!zc) {
+ int i = skb_shinfo(skb)->nr_frags;
================================================================================
* ONLY IN PATCH2 - files not modified by patch1 *
================================================================================
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1794,6 +1794,8 @@ alloc_new_skb:
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;This is an automated interdiff check for backported commits. |
|
✅ Validation checks completed successfully View full results: https://github.com/ctrliq/kernel-src-tree/actions/runs/25858283888 |
cve CVE-2026-46300 commit-author Hyunwoo Kim <imv4bel@gmail.com> commit - commit-source https://lore.kernel.org/all/agW4vC0r8QOUKtRT@v4bel/ upstream-diff | The upstream v3 patch does not apply cleanly to 4.18 due to three differences: 1. net/core/gro.c does not exist on 4.18. Both skb_gro_receive() and skb_gro_receive_list() are in net/core/skbuff.c. 2. skb_shift() context differs — 4.18 uses manual skb->len/data_len adjustments, upstream uses skb_len_add(). 3. 4.18 uses the older tx_flags/SKBTX_SHARED_FRAG API instead of the newer flags/SKBFL_SHARED_FRAG API introduced in later kernels. The actual code changes are identical to upstream, adapted for the 4.18 API. Three frag-transfer helpers (__pskb_copy_fclone(), skb_try_coalesce(), and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()->flags when moving frags from source to destination. __pskb_copy_fclone() defers the rest of the shinfo metadata to skb_copy_header() after copying frag descriptors, but that helper only carries over gso_{size,segs,type} and never touches skb_shinfo()->flags; skb_try_coalesce() and skb_shift() move frag descriptors directly and leave flags untouched. As a result, the destination skb keeps a reference to the same externally-owned or page-cache-backed pages while reporting skb_has_shared_frag() as false. The mismatch is harmful in any in-place writer that uses skb_has_shared_frag() to decide whether shared pages must be detoured through skb_cow_data(). ESP input is one such writer (esp4.c, esp6.c), and a single nft 'dup to <local>' rule -- or any other nf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()'d skb in esp_input() with the marker stripped, letting an unprivileged user write into the page cache of a root-owned read-only file via authencesn-ESN stray writes. Set SKBFL_SHARED_FRAG on the destination whenever frag descriptors were actually moved from the source. skb_copy() and skb_copy_expand() share skb_copy_header() too but linearize all paged data into freshly allocated head storage and emerge with nr_frags == 0, so skb_has_shared_frag() returns false on its own; they need no change. The same omission exists in skb_gro_receive() and skb_gro_receive_list(). The former moves the incoming skb's frag descriptors into the accumulator's last sub-skb via two paths (a direct frag-move loop and the head_frag + memcpy path); the latter chains the incoming skb whole onto p's frag_list. Downstream skb_segment() reads only skb_shinfo(p)->flags, and skb_segment_list() reuses each sub-skb's shinfo as the nskb -- both p and lp must carry the marker. Fixes: cef401d ("net: fix possible wrong checksum generation") Fixes: f4c50a4 ("xfrm: esp: avoid in-place decrypt on shared skb frags") Reported-by: William Bowling <vakzz@zellic.io> Reported-by: Hyunwoo Kim <imv4bel@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
shreeya-patel98
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🤖 Validation Checks In Progress Workflow run: https://github.com/ctrliq/kernel-src-tree/actions/runs/25865424720 |
🔍 Interdiff Analysis
================================================================================
* DELTA DIFFERENCES - code changes that differ between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1347,9 +1347,6 @@
goto error;
}
- if (!(flags & MSG_NO_SHARED_FRAGS))
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
-
if (skb->ip_summed == CHECKSUM_NONE) {
__wsum csum;
csum = csum_page(page, offset, len);
################################################################################
! REJECTED PATCH2 HUNKS - could not be compared; manual review needed !
################################################################################
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1233,6 +1233,8 @@
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;
================================================================================
* CONTEXT DIFFERENCES - surrounding code differences between the patches *
================================================================================
--- b/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1230,6 +1230,6 @@
- goto error;
- }
-
- if (skb->ip_summed == CHECKSUM_NONE) {
- __wsum csum;
- csum = csum_page(page, offset, len);
+ if (err < 0)
+ goto error;
+ copy = err;
+ wmem_alloc_delta += copy;
+ } else if (!zc) {
+ int i = skb_shinfo(skb)->nr_frags;
================================================================================
* ONLY IN PATCH2 - files not modified by patch1 *
================================================================================
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1794,6 +1794,8 @@ alloc_new_skb:
if (err < 0)
goto error;
copy = err;
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;This is an automated interdiff check for backported commits. |
|
✅ Validation checks completed successfully View full results: https://github.com/ctrliq/kernel-src-tree/actions/runs/25865424720 |
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Summary
This PR has been automatically created after successful completion of all CI stages.
Commit Message(s)
fragnesia and fragnesia-gro both fail:
Test Results
✅ Build Stage
✅ Boot Verification
✅ Kernel Selftests
✅ LTP Results
x86_64 newly passing:
🤖 This PR was automatically generated by GitHub Actions
Run ID: 25831211334