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author | Arnd Bergmann <arnd@arndb.de> | 2024-06-19 11:34:09 +0200 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2024-06-24 18:29:20 +0200 |
commit | 4b8e88e563b5f666446d002ad0dc1e6e8e7102b0 (patch) | |
tree | 4a3b1870dc71d4f2d867bf0217465c451f40c2a3 /arch/arm64/include/asm/unistd32.h | |
parent | f2661062f16b2de5d7b6a5c42a9a5c96326b8454 (diff) |
ftruncate: pass a signed offset
The old ftruncate() syscall, using the 32-bit off_t misses a sign
extension when called in compat mode on 64-bit architectures. As a
result, passing a negative length accidentally succeeds in truncating
to file size between 2GiB and 4GiB.
Changing the type of the compat syscall to the signed compat_off_t
changes the behavior so it instead returns -EINVAL.
The native entry point, the truncate() syscall and the corresponding
loff_t based variants are all correct already and do not suffer
from this mistake.
Fixes: 3f6d078d4acc ("fix compat truncate/ftruncate")
Reviewed-by: Christian Brauner <brauner@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm64/include/asm/unistd32.h')
0 files changed, 0 insertions, 0 deletions