🛡️ Sentinel: [CRITICAL] Fix TOCTOU and buffer overflow in trelay#55
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🛡️ Sentinel: [CRITICAL] Fix TOCTOU and buffer overflow in trelay#55
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🚨 Severity: CRITICAL 💡 Vulnerability: In `package/kernel/trelay/src/trelay.c`, the `trelay_do_add` function previously evaluated `strlen(name) + 1` directly inside `struct_size` for allocating memory with `kzalloc`, and subsequently used an unbounded `strcpy` to copy the `name` string into the structure's flexible array member. If the `name` buffer contents changed between the memory allocation and the string copy (Time-of-Check to Time-of-Use), it could result in an unbounded `strcpy` leading to a buffer overflow. 🎯 Impact: In a kernel module, an out-of-bounds write buffer overflow can lead to immediate system panics, arbitrary code execution, or severe memory corruption. 🔧 Fix: Extracted `strlen(name) + 1` into a cached `name_len` variable. Used this variable for both the memory allocation and a newly bounded `strscpy` call, ensuring consistent length guarantees and preventing TOCTOU vulnerabilities. Added a corresponding journal entry to `.jules/sentinel.md`. ✅ Verification: Visual inspection confirms the change is syntactically valid C. Syntax checking `gcc -fsyntax-only package/kernel/trelay/src/trelay.c` failed due to missing Linux kernel headers, as expected in the current environment. Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
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🚨 Severity: CRITICAL 💡 Vulnerability: In `package/kernel/trelay/src/trelay.c`, the `trelay_do_add` function previously evaluated `strlen(name) + 1` directly inside `struct_size` for allocating memory with `kzalloc`, and subsequently used an unbounded `strcpy` to copy the `name` string into the structure's flexible array member. If the `name` buffer contents changed between the memory allocation and the string copy (Time-of-Check to Time-of-Use), it could result in an unbounded `strcpy` leading to a buffer overflow. 🎯 Impact: In a kernel module, an out-of-bounds write buffer overflow can lead to immediate system panics, arbitrary code execution, or severe memory corruption. 🔧 Fix: Extracted `strlen(name) + 1` into a cached `name_len` variable. Used this variable for both the memory allocation and a newly bounded `strscpy` call, ensuring consistent length guarantees and preventing TOCTOU vulnerabilities. Added a corresponding journal entry to `.jules/sentinel.md`. ✅ Verification: Visual inspection confirms the change is syntactically valid C. Syntax checking `gcc -fsyntax-only package/kernel/trelay/src/trelay.c` failed due to missing Linux kernel headers, as expected in the current environment. Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
🚨 Severity: CRITICAL 💡 Vulnerability: In `package/kernel/trelay/src/trelay.c`, the `trelay_do_add` function previously evaluated `strlen(name) + 1` directly inside `struct_size` for allocating memory with `kzalloc`, and subsequently used an unbounded `strcpy` to copy the `name` string into the structure's flexible array member. If the `name` buffer contents changed between the memory allocation and the string copy (Time-of-Check to Time-of-Use), it could result in an unbounded `strcpy` leading to a buffer overflow. 🎯 Impact: In a kernel module, an out-of-bounds write buffer overflow can lead to immediate system panics, arbitrary code execution, or severe memory corruption. 🔧 Fix: Extracted `strlen(name) + 1` into a cached `name_len` variable. Used this variable for both the memory allocation and a newly bounded `strscpy` call, ensuring consistent length guarantees and preventing TOCTOU vulnerabilities. Added a corresponding journal entry to `.jules/sentinel.md`. ✅ Verification: Visual inspection confirms the change is syntactically valid C. Syntax checking `gcc -fsyntax-only package/kernel/trelay/src/trelay.c` failed due to missing Linux kernel headers, as expected in the current environment. Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
🚨 Severity: CRITICAL 💡 Vulnerability: In `package/kernel/trelay/src/trelay.c`, the `trelay_do_add` function previously evaluated `strlen(name) + 1` directly inside `struct_size` for allocating memory with `kzalloc`, and subsequently used an unbounded `strcpy` to copy the `name` string into the structure's flexible array member. If the `name` buffer contents changed between the memory allocation and the string copy (Time-of-Check to Time-of-Use), it could result in an unbounded `strcpy` leading to a buffer overflow. 🎯 Impact: In a kernel module, an out-of-bounds write buffer overflow can lead to immediate system panics, arbitrary code execution, or severe memory corruption. 🔧 Fix: Extracted `strlen(name) + 1` into a cached `name_len` variable. Used this variable for both the memory allocation and a newly bounded `strscpy` call, ensuring consistent length guarantees and preventing TOCTOU vulnerabilities. Added a corresponding journal entry to `.jules/sentinel.md`. ✅ Verification: Visual inspection confirms the change is syntactically valid C. Syntax checking `gcc -fsyntax-only package/kernel/trelay/src/trelay.c` failed due to missing Linux kernel headers, as expected in the current environment. Signed-off-by: google-labs-jules <google-labs-jules@users.noreply.github.com> Co-authored-by: manupawickramasinghe <73810867+manupawickramasinghe@users.noreply.github.com>
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🚨 Severity: CRITICAL
💡 Vulnerability: In
package/kernel/trelay/src/trelay.c, thetrelay_do_addfunction previously evaluatedstrlen(name) + 1directly insidestruct_sizefor allocating memory withkzalloc, and subsequently used an unboundedstrcpyto copy thenamestring into the structure's flexible array member. If thenamebuffer contents changed between the memory allocation and the string copy (Time-of-Check to Time-of-Use), it could result in an unboundedstrcpyleading to a buffer overflow.🎯 Impact: In a kernel module, an out-of-bounds write buffer overflow can lead to immediate system panics, arbitrary code execution, or severe memory corruption.
🔧 Fix: Extracted
strlen(name) + 1into a cachedname_lenvariable. Used this variable for both the memory allocation and a newly boundedstrscpycall, ensuring consistent length guarantees and preventing TOCTOU vulnerabilities. Added a corresponding journal entry to.jules/sentinel.md.✅ Verification: Visual inspection confirms the change is syntactically valid C. Syntax checking
gcc -fsyntax-only package/kernel/trelay/src/trelay.cfailed due to missing Linux kernel headers, as expected in the current environment.PR created automatically by Jules for task 3008699587815432785 started by @manupawickramasinghe